Hydrogels because of their unique potentials, such as highwater content and hydrophilicity, are o... more Hydrogels because of their unique potentials, such as highwater content and hydrophilicity, are of interest for the controlled release of drug molecules. In the present study, a biofilm was produced using chitosan, a natural polymer. Characterization analyses of the synthesized biofilm were performed using Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis-differential thermal analysis, x-ray diffraction, and scanning electron microscopy-energy dispersive x-ray spectrometry. The analysis results of the film before loading were compared to the analysis made after adding vitamin B 12 to the film. The release percentage of vitamin B 12 was investigated by using ultraviolet-visible spectrophotometery. The FT-IR bands of vitamin B 12 were in the range of 2,800-3,500 cm -1 and 1,000 cm -1 -1,750 cm -1 . When pH increased from 3 to 7, release of vitamin B 12 from the biopolymer increased up to pH 5. While examining the release potential, parameters, such as pH, initial concentration of vitamin B 12 , release time, and solution volume, were optimized by using response surface methodology. It was determined that with the increase in release time and the initial concentration, pH contributed positively to the release of vitamin B 12 . The following conditions were determined for release of vitamin B 12 from the biofilm: pH: 4.2, initial concentration of vitamin B 12 : 54.0 mg L -1 , the release time: 117 min, and volume of solution: 2.1 mL. The analysis of variance results showed that the determination coefficients for the use of synthesized biofilm in vitamin B 12 release were high and R 2 =0.9704.
A simple, sensitive, accurate, and selective method for determination of ultratrace levels of cop... more A simple, sensitive, accurate, and selective method for determination of ultratrace levels of copper is modified. The method is based on preconcentration of copper on the 4‐(2‐pyridyl‐azo) resorcinol‐loaded amberlite XAD‐7 (non‐ionic copoly[styrene‐acrylic compound]) at pH 5.0 to 6.5 for contact time as low as 45 minutes. The adsorbed copper was eluted with concentrated nitric acid and measured by flame atomic absorption spectrometry. Recoveries of up to 90% were achieved. The optimized preconcentration method was applied to copper determination in various water samples. The detection limit was found to be 0.09 ng mL −1. The relative standard deviation was found to be 9% using 300 mL of 5.0 ng mL −1 for 10 replicate preconcentration procedures. Copper concentrations in the studied water samples were found to be in the ranges of 0.4 to 18.0 ng mL −1.
Using food wastes biomass as effective adsorbents in water and wastewater treatment for Cu (II) r... more Using food wastes biomass as effective adsorbents in water and wastewater treatment for Cu (II) removal.
In this study, fixed-bed adsorption studies for the removal of Bisphenol A from aqueous solutions... more In this study, fixed-bed adsorption studies for the removal of Bisphenol A from aqueous solutions were carried out on a synthesized oil palm shell based activated carbon modified with ammonia (denoted as PCAC-AM) to enhance its adsorption capacity. The effects of bed depth, initial BPA concentration and solution flow rate were investigated. The results revealed that, shorter breakthrough time, and high adsorption capacity was obtained at high flow rates of 9 mL/min, while longer breakthrough and lower adsorption capacity was obtained at lower flow rates of 3 mL/min. The effects of bed depth on the breakthrough curve of BPA sorption was a steep breakthrough curve or shorter breakthrough time occurred at lower bed height. The Adams-Bohart, Thomas and Yoon-Nelson models were applied to predict the adsorption under various experimental parameters. The Yoon-Nelson model was in good agreement with the experimental data for the breakthrough curves. The study also showed that, activated carbons modified with ammonia can facilitate quick and efficient way to remove Bisphenol A from water and wastewater.
Wild nettle (Urtica dioica L.) types were sampled from different geographical regions in Tunceli ... more Wild nettle (Urtica dioica L.) types were sampled from different geographical regions in Tunceli (Turkey) to determine their mineral, vitamin, phenolic contents and their antioxidant properties. The total phenol varied from 37.419 ± 0.380 to 19.182 ± 1.00 mg of GAEs g(-1) of dry nettle. The highest radical scavenging effect was observed in Mazgirt parting of the ways 7.5 km with 33.70 ± 0.849 mg mL(-1). The highest reducing power was observed in the nettles from Mazgirt parting of the ways 7.5 km. Among the various macronutrients estimated in the plant samples, potassium was present in the highest quantity followed by calcium and phosphate. Kaempferol and resveratrol were not determined in some nettle samples but rutin levels were determined in all samples. Vitamin A concentrations were ranged between 13.64 ± 1.90 and 5.74 ± 1.00 (mg kg(-1) dry weight). These results show that Urtica dioica L. collected from Tunceli in Turkey could be considered as a natural alternative source for food, pharmacology and medicine sectors.
ABSTRACT The presence of cadmium in water is a serious threat to the environment. The removal of ... more ABSTRACT The presence of cadmium in water is a serious threat to the environment. The removal of cadmium using hydroxyapatite as an adsorbent was studied in an aqueous system. Hydroxyapatite was prepared to process the adsorption of cadmium from aqueous solution. Experimental design methodology and response surface methodology (RSM) with a quadratic model associated with central composite design was used to optimize the pH, initial heavy metal concentration, final volume, and adsorbent dosage for the removal of cadmium. Analysis of variance identified significant factors on each parameter. RSM indicated that a pH of 8.5, a sample volume of 166 mL, an adsorbent of dosage 0.57 g, and a contact time of 82 min were optimal for the adsorption of Cd(II). Under these conditions, the removal of Cd(II) was 895 mg g−1.
In this study, in order to investigate the bioremediation efficiency of Phanerochaete chrysospori... more In this study, in order to investigate the bioremediation efficiency of Phanerochaete chrysosporium, chemical oxygen demand (COD) reduction, total phosphate levels and heavy metal (Fe 2+ , Mn 2+ , Zn 2+ and Cu 2+) removal were determined in five different experimental groups (control, X, Y, Z, and T) under static culture conditions containing leachate at different incubation periods (5, 10, and 20 d). At the end of the 20th day of incubation, 84% Mn 2+ and Zn 2+ removal was achieved in X application group. In the same application group, 90.88% COD reduction was also obtained. The lowest total phosphate value was determined as 2.63 g L-1 in T group compared with control group (5.0 g L-1). Similar improvements have been identified in other application groups in terms of metal removal, total phosphate levels and COD reduction. As a result, the findings obtained from our study show that white rot fungus P. chrysosporium can be used as an alternative biological resource in the studies for improving landfill leachate in terms of metal removal efficacy, COD and total phosphate level reduction capacity.
The quantity of some essential and non-essential elements of wild edible mushroom samples collect... more The quantity of some essential and non-essential elements of wild edible mushroom samples collected from Tunceli Province of Turkey was determined by using flame and electrothermal atomic absorption spectrometer after microwave digestion. The method accuracy was corrected using standard reference material (NIST SRM 1547-Peach Leaves). The essential element concentrations of analyzed mushroom samples were determined in the range of 0.036-0.563 mg kg −1 for calcium, 1.28-2.55 mg kg −1 for magnesium, 0.054-0.188 mg kg −1 for sodium, 1.00-4.57 mg kg −1 for copper, 212-480 mg kg −1 for iron, and 75-151 mg kg −1 for zinc but cobalt and chromium were not detected. Based on results, there were statistically significant differences between the element contents of analyzed mushroom species. Consequently, according to this study results, the weekly intake and target hazard quotient values of the elements show that the consumption of these mushrooms does not threaten human health.
The aim of the present research was to apply the Box-Behnken experimental design and response sur... more The aim of the present research was to apply the Box-Behnken experimental design and response surface methodology for modeling of copper (Cu 2+) ions from an industrial wastewater and leachate pretreated astragalus herbal plant. A three factor, three level Box-Behnken experimental design combined with response surface modeling (RSM) and quadratic programming (QP) was employed for maximizing Cu(II) removal from aqueous solution based on 17 different experimental data obtained in a batch experimental study. Three independent variables (pH ranging from 2.0 to 8.0, contact time from 10 to 180 minutes, and adsorbent amount from 0.1 to 1 g) were studied. The significance of the independent variables and their interactions were tested by means of the analysis of variance (ANOVA) with 95% confidence limits. The
In the present study, a novel biosorbent, namely Agaricus campestris, was used for the removal of... more In the present study, a novel biosorbent, namely Agaricus campestris, was used for the removal of Methylene Blue (MB) from an aqueous medium. The biosorbent was characterized using fourier-transform infrared spectrometer spectra, scanning electron microscopy-energy dispersive X-ray, and thermogravimetric analysis. The influence of important process parameters including pH (4-7), temperature (25°C-35°C), contact time (15-25 min), and biosorbent amount (40-80 mg) on the uptake of MB solution were also optimized, which significantly affected the removal efficiency of MB. A central composite design (CCD) combined with response surface modeling (RSM) was carried out to maximize MB removal by A. campestris for the adsorption process. A regression model was derived using RSM to predict the responses and analysis of variance (ANOVA), and to check model adequacy lack of fit test was used. The A. campestris adsorption capacity was determined as 24.2 mg g-1. The ANOVA showed a high coefficient of determination (R 2 = 0.9987). This study clearly revealed that RSM was one of the most effective and appropriate method for the optimization of operating conditions. The possibility of reusing A. campestris was also investigated and, as a result, it was found quite possible and showed high performance in the recovery of MB.
This is the first study about removal of lead (Pb(II)) from energy drinks. In this paper, food wa... more This is the first study about removal of lead (Pb(II)) from energy drinks. In this paper, food waste, namely eggshell (hydroxyapatite) utilization, was used to remove Pb(II) from mineral water and energy drinks. Mineral water and energy drinks were chosen for removal of lead since the latter is severely hazardous to human health even in small amounts. Response Surface Methodology (RSM) was performed to optimize the application process by practice of the quadratic model united with the Central Composite Design (CCD) and quadratic combined program was utilized to study the most effective parameters on aforementioned liquids. Through the application of variance analysis (ANOVA) factors critical to removing of lead were identified for each experimental design response. Maximum adsorption capacity of eggshell was achieved as 923 mg g-1 for Pb(II). The obtained optimum conditions were applied to drinks. Results showed that used adsorbent was quite effective in removing Pb(II) from drinks.
The aim of the present research was to apply the Box-Behnken experimental design and response sur... more The aim of the present research was to apply the Box-Behnken experimental design and response surface methodology for modeling of copper (Cu 2+) ions from an industrial wastewater and leachate pretreated astragalus herbal plant. A three factor, three level Box-Behnken experimental design combined with response surface modeling (RSM) and quadratic programming (QP) was employed for maximizing Cu(II) removal from aqueous solution based on 17 different experimental data obtained in a batch experimental study. Three independent variables (pH ranging from 2.0 to 8.0, contact time from 10 to 180 minutes, and adsorbent amount from 0.1 to 1 g) were studied. The significance of the independent variables and their interactions were tested by means of the analysis of variance (ANOVA) with 95% confidence limits. The
Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2022
Bu çalışmada, kesikli sistemde, ponza kullanılarak çözeltilerden Cu(II) ve Pb(II) iyonlarının uza... more Bu çalışmada, kesikli sistemde, ponza kullanılarak çözeltilerden Cu(II) ve Pb(II) iyonlarının uzaklaştırılması amaçlanmıştır. Adsorban miktarı etkisi (0.1-0.5g), Cu(II) ve Pb(II) iyon çözeltilerinin derişim etkisi (Cu(II) için; 3.2-31.8 ppm, Pb(II) için; 10.2-103.6 ppm), çözeltilerin pH etkisi (Cu(II) için 3-6.1(doğal pH), Pb(II) için 3-5.25(doğal pH)) gibi değişken parametrelerin etkileri incelenmiştir. Adsorban miktarının 0.4 g, çözelti iyon derişiminin 6.4 ppm ve pH değerinin 6.1 olduğu optimum şartlarda %91 bakır giderim verimi elde edilirken adsorban miktarının 0.4 g, çözelti iyon derişiminin 20.7 ppm ve pH değerinin 5.2 olduğu optimum şartlarda %97.7 kurşun giderim verimi elde edilmiştir. Deneysel olarak bulunan adsorpsiyon verilerine Langmuir, Freundlich, Temkin ve Harkins-Jura izoterm modelleri uygulanarak modellenmiş ve izoterm sabitleri hesaplanmıştır. Bakır ve kurşun iyonlarının adsorpsiyonunda Freundlich izoterm modeli deney verilerine en uygun model olarak belirlenmiştir. Bakır için ponzanın maksimum adsorplama kapasitesi 2.55 mg g-1 , kurşun için bu değer 10.28 mg g-1 olarak bulunmuştur. Adsorpsiyon kinetiklerinin yalancı ikinci mertebeden kinetik modeline daha uyumlu olduğu belirlenmiştir. Farklı sıcaklıklarda standart serbest enerji değişimi (ΔG°), entalpi (ΔH°) ve entropi (ΔS°) değerleri belirlenmiştir. Yapılan çalışmada elde edilen sonuçlar, diğer adsorbanlarla karşılaştırıldığında ponzanın sulu çözeltilerden ağır metallerin gideriminde etkin, ekonomik ve alternatif bir adsorban malzemesi olabileceğini göstermiştir.
A sensitive, simple and selective preconcentration method was developed for the preconcentration ... more A sensitive, simple and selective preconcentration method was developed for the preconcentration of trace amounts of Ni(II) ions using 1-(2-pyridylazo)-2-naphthol (PAN) modified β-cyclodextrin butanediol diglycidyl ether polymer as a solid phase extractant. Potential factors affecting the sorption of Ni(II) were investigated. Meanwhile, the optimum conditions were established. The sorbed Ni(II) was eluted using 5 ml of 2M HCl. The preconcentration factor was 70. The detection limit for Ni(II) was 1.18 ng/ml. The relative standard deviation (RSD %) was <1%. The developed method was successfully applied for the determination of trace Ni(II) in different water and potato chip samples as well as reference alloy samples.
This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright
In present study, an e cient superparamagnetic Fe 3 O 4 /alginate nanocomposite material (SPFe 3 ... more In present study, an e cient superparamagnetic Fe 3 O 4 /alginate nanocomposite material (SPFe 3 O 4 /alg-NCM) was green-synthesized and used as nanosorbent to remove some heavy metals from industrial wastewater. Green-synthesized SPFe 3 O 4 /alg-NCM was characterized by using fourier transform infrared spectroscopy (FT-IR) with attenuated total re ection (ATR) unit, UV-Vis spectrophotometer, scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), thermogravimetric analysis (TGA) and differential thermal analysis (DTA) techniques. For determination the experimental conditions to ensure maximum adsorption capacity and to nd the effects of various variables including initial heavy metal concentration and ow rate on the adsorption e ciency in column system central compoiste design (CCD) was used. To predict of responses and ANOVA a regression model were derived from CCD. The adsorption e ciencies and capacities of SPFe 3 O 4 /alg-NCM were calculated as 31.93 mg g-1 for Cd 2+ and 58.8 mg g-1 for Co 2+. The obtained results have proven that nanosorbent can be used successfully and effectively to remove metals from industrial wastewaters. In addition, being reusable and inexpensive are other important advantages of nanosorbent.
Hydrogels because of their unique potentials, such as highwater content and hydrophilicity, are o... more Hydrogels because of their unique potentials, such as highwater content and hydrophilicity, are of interest for the controlled release of drug molecules. In the present study, a biofilm was produced using chitosan, a natural polymer. Characterization analyses of the synthesized biofilm were performed using Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis-differential thermal analysis, x-ray diffraction, and scanning electron microscopy-energy dispersive x-ray spectrometry. The analysis results of the film before loading were compared to the analysis made after adding vitamin B 12 to the film. The release percentage of vitamin B 12 was investigated by using ultraviolet-visible spectrophotometery. The FT-IR bands of vitamin B 12 were in the range of 2,800-3,500 cm -1 and 1,000 cm -1 -1,750 cm -1 . When pH increased from 3 to 7, release of vitamin B 12 from the biopolymer increased up to pH 5. While examining the release potential, parameters, such as pH, initial concentration of vitamin B 12 , release time, and solution volume, were optimized by using response surface methodology. It was determined that with the increase in release time and the initial concentration, pH contributed positively to the release of vitamin B 12 . The following conditions were determined for release of vitamin B 12 from the biofilm: pH: 4.2, initial concentration of vitamin B 12 : 54.0 mg L -1 , the release time: 117 min, and volume of solution: 2.1 mL. The analysis of variance results showed that the determination coefficients for the use of synthesized biofilm in vitamin B 12 release were high and R 2 =0.9704.
A simple, sensitive, accurate, and selective method for determination of ultratrace levels of cop... more A simple, sensitive, accurate, and selective method for determination of ultratrace levels of copper is modified. The method is based on preconcentration of copper on the 4‐(2‐pyridyl‐azo) resorcinol‐loaded amberlite XAD‐7 (non‐ionic copoly[styrene‐acrylic compound]) at pH 5.0 to 6.5 for contact time as low as 45 minutes. The adsorbed copper was eluted with concentrated nitric acid and measured by flame atomic absorption spectrometry. Recoveries of up to 90% were achieved. The optimized preconcentration method was applied to copper determination in various water samples. The detection limit was found to be 0.09 ng mL −1. The relative standard deviation was found to be 9% using 300 mL of 5.0 ng mL −1 for 10 replicate preconcentration procedures. Copper concentrations in the studied water samples were found to be in the ranges of 0.4 to 18.0 ng mL −1.
Using food wastes biomass as effective adsorbents in water and wastewater treatment for Cu (II) r... more Using food wastes biomass as effective adsorbents in water and wastewater treatment for Cu (II) removal.
In this study, fixed-bed adsorption studies for the removal of Bisphenol A from aqueous solutions... more In this study, fixed-bed adsorption studies for the removal of Bisphenol A from aqueous solutions were carried out on a synthesized oil palm shell based activated carbon modified with ammonia (denoted as PCAC-AM) to enhance its adsorption capacity. The effects of bed depth, initial BPA concentration and solution flow rate were investigated. The results revealed that, shorter breakthrough time, and high adsorption capacity was obtained at high flow rates of 9 mL/min, while longer breakthrough and lower adsorption capacity was obtained at lower flow rates of 3 mL/min. The effects of bed depth on the breakthrough curve of BPA sorption was a steep breakthrough curve or shorter breakthrough time occurred at lower bed height. The Adams-Bohart, Thomas and Yoon-Nelson models were applied to predict the adsorption under various experimental parameters. The Yoon-Nelson model was in good agreement with the experimental data for the breakthrough curves. The study also showed that, activated carbons modified with ammonia can facilitate quick and efficient way to remove Bisphenol A from water and wastewater.
Wild nettle (Urtica dioica L.) types were sampled from different geographical regions in Tunceli ... more Wild nettle (Urtica dioica L.) types were sampled from different geographical regions in Tunceli (Turkey) to determine their mineral, vitamin, phenolic contents and their antioxidant properties. The total phenol varied from 37.419 ± 0.380 to 19.182 ± 1.00 mg of GAEs g(-1) of dry nettle. The highest radical scavenging effect was observed in Mazgirt parting of the ways 7.5 km with 33.70 ± 0.849 mg mL(-1). The highest reducing power was observed in the nettles from Mazgirt parting of the ways 7.5 km. Among the various macronutrients estimated in the plant samples, potassium was present in the highest quantity followed by calcium and phosphate. Kaempferol and resveratrol were not determined in some nettle samples but rutin levels were determined in all samples. Vitamin A concentrations were ranged between 13.64 ± 1.90 and 5.74 ± 1.00 (mg kg(-1) dry weight). These results show that Urtica dioica L. collected from Tunceli in Turkey could be considered as a natural alternative source for food, pharmacology and medicine sectors.
ABSTRACT The presence of cadmium in water is a serious threat to the environment. The removal of ... more ABSTRACT The presence of cadmium in water is a serious threat to the environment. The removal of cadmium using hydroxyapatite as an adsorbent was studied in an aqueous system. Hydroxyapatite was prepared to process the adsorption of cadmium from aqueous solution. Experimental design methodology and response surface methodology (RSM) with a quadratic model associated with central composite design was used to optimize the pH, initial heavy metal concentration, final volume, and adsorbent dosage for the removal of cadmium. Analysis of variance identified significant factors on each parameter. RSM indicated that a pH of 8.5, a sample volume of 166 mL, an adsorbent of dosage 0.57 g, and a contact time of 82 min were optimal for the adsorption of Cd(II). Under these conditions, the removal of Cd(II) was 895 mg g−1.
In this study, in order to investigate the bioremediation efficiency of Phanerochaete chrysospori... more In this study, in order to investigate the bioremediation efficiency of Phanerochaete chrysosporium, chemical oxygen demand (COD) reduction, total phosphate levels and heavy metal (Fe 2+ , Mn 2+ , Zn 2+ and Cu 2+) removal were determined in five different experimental groups (control, X, Y, Z, and T) under static culture conditions containing leachate at different incubation periods (5, 10, and 20 d). At the end of the 20th day of incubation, 84% Mn 2+ and Zn 2+ removal was achieved in X application group. In the same application group, 90.88% COD reduction was also obtained. The lowest total phosphate value was determined as 2.63 g L-1 in T group compared with control group (5.0 g L-1). Similar improvements have been identified in other application groups in terms of metal removal, total phosphate levels and COD reduction. As a result, the findings obtained from our study show that white rot fungus P. chrysosporium can be used as an alternative biological resource in the studies for improving landfill leachate in terms of metal removal efficacy, COD and total phosphate level reduction capacity.
The quantity of some essential and non-essential elements of wild edible mushroom samples collect... more The quantity of some essential and non-essential elements of wild edible mushroom samples collected from Tunceli Province of Turkey was determined by using flame and electrothermal atomic absorption spectrometer after microwave digestion. The method accuracy was corrected using standard reference material (NIST SRM 1547-Peach Leaves). The essential element concentrations of analyzed mushroom samples were determined in the range of 0.036-0.563 mg kg −1 for calcium, 1.28-2.55 mg kg −1 for magnesium, 0.054-0.188 mg kg −1 for sodium, 1.00-4.57 mg kg −1 for copper, 212-480 mg kg −1 for iron, and 75-151 mg kg −1 for zinc but cobalt and chromium were not detected. Based on results, there were statistically significant differences between the element contents of analyzed mushroom species. Consequently, according to this study results, the weekly intake and target hazard quotient values of the elements show that the consumption of these mushrooms does not threaten human health.
The aim of the present research was to apply the Box-Behnken experimental design and response sur... more The aim of the present research was to apply the Box-Behnken experimental design and response surface methodology for modeling of copper (Cu 2+) ions from an industrial wastewater and leachate pretreated astragalus herbal plant. A three factor, three level Box-Behnken experimental design combined with response surface modeling (RSM) and quadratic programming (QP) was employed for maximizing Cu(II) removal from aqueous solution based on 17 different experimental data obtained in a batch experimental study. Three independent variables (pH ranging from 2.0 to 8.0, contact time from 10 to 180 minutes, and adsorbent amount from 0.1 to 1 g) were studied. The significance of the independent variables and their interactions were tested by means of the analysis of variance (ANOVA) with 95% confidence limits. The
In the present study, a novel biosorbent, namely Agaricus campestris, was used for the removal of... more In the present study, a novel biosorbent, namely Agaricus campestris, was used for the removal of Methylene Blue (MB) from an aqueous medium. The biosorbent was characterized using fourier-transform infrared spectrometer spectra, scanning electron microscopy-energy dispersive X-ray, and thermogravimetric analysis. The influence of important process parameters including pH (4-7), temperature (25°C-35°C), contact time (15-25 min), and biosorbent amount (40-80 mg) on the uptake of MB solution were also optimized, which significantly affected the removal efficiency of MB. A central composite design (CCD) combined with response surface modeling (RSM) was carried out to maximize MB removal by A. campestris for the adsorption process. A regression model was derived using RSM to predict the responses and analysis of variance (ANOVA), and to check model adequacy lack of fit test was used. The A. campestris adsorption capacity was determined as 24.2 mg g-1. The ANOVA showed a high coefficient of determination (R 2 = 0.9987). This study clearly revealed that RSM was one of the most effective and appropriate method for the optimization of operating conditions. The possibility of reusing A. campestris was also investigated and, as a result, it was found quite possible and showed high performance in the recovery of MB.
This is the first study about removal of lead (Pb(II)) from energy drinks. In this paper, food wa... more This is the first study about removal of lead (Pb(II)) from energy drinks. In this paper, food waste, namely eggshell (hydroxyapatite) utilization, was used to remove Pb(II) from mineral water and energy drinks. Mineral water and energy drinks were chosen for removal of lead since the latter is severely hazardous to human health even in small amounts. Response Surface Methodology (RSM) was performed to optimize the application process by practice of the quadratic model united with the Central Composite Design (CCD) and quadratic combined program was utilized to study the most effective parameters on aforementioned liquids. Through the application of variance analysis (ANOVA) factors critical to removing of lead were identified for each experimental design response. Maximum adsorption capacity of eggshell was achieved as 923 mg g-1 for Pb(II). The obtained optimum conditions were applied to drinks. Results showed that used adsorbent was quite effective in removing Pb(II) from drinks.
The aim of the present research was to apply the Box-Behnken experimental design and response sur... more The aim of the present research was to apply the Box-Behnken experimental design and response surface methodology for modeling of copper (Cu 2+) ions from an industrial wastewater and leachate pretreated astragalus herbal plant. A three factor, three level Box-Behnken experimental design combined with response surface modeling (RSM) and quadratic programming (QP) was employed for maximizing Cu(II) removal from aqueous solution based on 17 different experimental data obtained in a batch experimental study. Three independent variables (pH ranging from 2.0 to 8.0, contact time from 10 to 180 minutes, and adsorbent amount from 0.1 to 1 g) were studied. The significance of the independent variables and their interactions were tested by means of the analysis of variance (ANOVA) with 95% confidence limits. The
Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2022
Bu çalışmada, kesikli sistemde, ponza kullanılarak çözeltilerden Cu(II) ve Pb(II) iyonlarının uza... more Bu çalışmada, kesikli sistemde, ponza kullanılarak çözeltilerden Cu(II) ve Pb(II) iyonlarının uzaklaştırılması amaçlanmıştır. Adsorban miktarı etkisi (0.1-0.5g), Cu(II) ve Pb(II) iyon çözeltilerinin derişim etkisi (Cu(II) için; 3.2-31.8 ppm, Pb(II) için; 10.2-103.6 ppm), çözeltilerin pH etkisi (Cu(II) için 3-6.1(doğal pH), Pb(II) için 3-5.25(doğal pH)) gibi değişken parametrelerin etkileri incelenmiştir. Adsorban miktarının 0.4 g, çözelti iyon derişiminin 6.4 ppm ve pH değerinin 6.1 olduğu optimum şartlarda %91 bakır giderim verimi elde edilirken adsorban miktarının 0.4 g, çözelti iyon derişiminin 20.7 ppm ve pH değerinin 5.2 olduğu optimum şartlarda %97.7 kurşun giderim verimi elde edilmiştir. Deneysel olarak bulunan adsorpsiyon verilerine Langmuir, Freundlich, Temkin ve Harkins-Jura izoterm modelleri uygulanarak modellenmiş ve izoterm sabitleri hesaplanmıştır. Bakır ve kurşun iyonlarının adsorpsiyonunda Freundlich izoterm modeli deney verilerine en uygun model olarak belirlenmiştir. Bakır için ponzanın maksimum adsorplama kapasitesi 2.55 mg g-1 , kurşun için bu değer 10.28 mg g-1 olarak bulunmuştur. Adsorpsiyon kinetiklerinin yalancı ikinci mertebeden kinetik modeline daha uyumlu olduğu belirlenmiştir. Farklı sıcaklıklarda standart serbest enerji değişimi (ΔG°), entalpi (ΔH°) ve entropi (ΔS°) değerleri belirlenmiştir. Yapılan çalışmada elde edilen sonuçlar, diğer adsorbanlarla karşılaştırıldığında ponzanın sulu çözeltilerden ağır metallerin gideriminde etkin, ekonomik ve alternatif bir adsorban malzemesi olabileceğini göstermiştir.
A sensitive, simple and selective preconcentration method was developed for the preconcentration ... more A sensitive, simple and selective preconcentration method was developed for the preconcentration of trace amounts of Ni(II) ions using 1-(2-pyridylazo)-2-naphthol (PAN) modified β-cyclodextrin butanediol diglycidyl ether polymer as a solid phase extractant. Potential factors affecting the sorption of Ni(II) were investigated. Meanwhile, the optimum conditions were established. The sorbed Ni(II) was eluted using 5 ml of 2M HCl. The preconcentration factor was 70. The detection limit for Ni(II) was 1.18 ng/ml. The relative standard deviation (RSD %) was <1%. The developed method was successfully applied for the determination of trace Ni(II) in different water and potato chip samples as well as reference alloy samples.
This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright
In present study, an e cient superparamagnetic Fe 3 O 4 /alginate nanocomposite material (SPFe 3 ... more In present study, an e cient superparamagnetic Fe 3 O 4 /alginate nanocomposite material (SPFe 3 O 4 /alg-NCM) was green-synthesized and used as nanosorbent to remove some heavy metals from industrial wastewater. Green-synthesized SPFe 3 O 4 /alg-NCM was characterized by using fourier transform infrared spectroscopy (FT-IR) with attenuated total re ection (ATR) unit, UV-Vis spectrophotometer, scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), thermogravimetric analysis (TGA) and differential thermal analysis (DTA) techniques. For determination the experimental conditions to ensure maximum adsorption capacity and to nd the effects of various variables including initial heavy metal concentration and ow rate on the adsorption e ciency in column system central compoiste design (CCD) was used. To predict of responses and ANOVA a regression model were derived from CCD. The adsorption e ciencies and capacities of SPFe 3 O 4 /alg-NCM were calculated as 31.93 mg g-1 for Cd 2+ and 58.8 mg g-1 for Co 2+. The obtained results have proven that nanosorbent can be used successfully and effectively to remove metals from industrial wastewaters. In addition, being reusable and inexpensive are other important advantages of nanosorbent.
Uploads
Papers by Muharrem İnce