Mentha Longifolia (ML) and Mentha Puleguim (MP) are usually used as a flavor and medicinal plants... more Mentha Longifolia (ML) and Mentha Puleguim (MP) are usually used as a flavor and medicinal plants in Saudi Arabia. The present study was carried out to compare the potential of methanol extract of fresh leaves of ML and MP as free radical (DPPH) scavenger by fixed point and kinetic methods. In a fixed point method, free radical scavenging capacity was expressed by effective concentration, EC 50. However, in kinetic method, capacity expressed by rate constant value. Some other antioxidants parameters like total flavonoids content and total phenolic content were also estimated. Flavonoid content was obtained as catechin equivalent and total phenolic content as gallic acid equivalent. The obtained results indicate that methanol extract of MP possess a high concentration of flavonoids (6.55± 0.42 mg/100 ml) and of phenolic (3.72 ±0.29 mg/100 ml) compared to that of ML flavonoids (3.22± 0.43 mg/100 ml) and of phenolic (1.91 ±0.06 mg/100 ml).
Green routes for remediation of heavy metals are worldwide challenges to overcome pollution probl... more Green routes for remediation of heavy metals are worldwide challenges to overcome pollution problems on one hand and control the adverse impact of chemicals on the other hand. Biosorption is one of the most effective methods for removing lower level of heavy metals. The idea to apply natural resources as a green method for removal of heavy metals, this route has no adverse impacts on the environment. This study investigated the ability of chemically modified Ziziphus spina-christi stones (ZSCs) as agriculture by-products to perform the biosorption of Pb(II), Zn(II) and Cd(II) ions from wastewater in a single and ternary metal system. The characteristic functional groups of chemically modified ZSCs were analyzed by Fourier transform infrared. In comparison with acidic ZSCs, alkali-modified ZSCs by KOH was more effective and enhanced the removal efficiency of ZSCs. Using Langmuir isotherm, the maximum adsorption capacity on the modified ZSCs for Pb(II) was 9.06 mg/g, for Zn(II) obtain...
Membrane processes for separation of chemical species from a mixture are gaining in importance an... more Membrane processes for separation of chemical species from a mixture are gaining in importance and are emerging as a viable alternative to conventional separation processes. The emulsion liquid membrane (ELM) technique was regarded as an emerging separation technology and was extensively examined for potential applications in such fields as hydrometallurgy, environmental engineering, biochemical engineering, pharmaceutical engineering, and food technology. In the present work, the removal of Cerium ions from acidic solution by using an emulsion liquid membrane (ELM) technique was investigated and we obtained > 98% efficiency with the treatment. For the transport of Ce(III) ions using Cyanex 301 as extractant, the effects of extractant and surfactant concentrations, mixing speed, concentration and type of stripping solution, phase ratio, treatment ratio, and nature of diluent on the extraction rate were studies. Under the optimum conditions, solvent extraction and stripping of ...
The efficiency of grounded date stone (Phoenix dactylifera L.) as biosorbent for water remediatio... more The efficiency of grounded date stone (Phoenix dactylifera L.) as biosorbent for water remediation was investigated. The sorption of Saudi Arabia date stones is supposed to take place mainly by electrostatic attraction between negatively charged stones surface and metals. The stone surface is negative because of translocation of sugars and proteins (containing N, S and P) from dates to stones. Various physicochemical parameters that influence the speciation and mobility of metal contaminants such as pH, contact time, adsorbent mass, and adsorbate initial concentration was applied. The general trend is that the metal uptake increases when the pH increases.
There are several naturally existing materials have ability to utilize as ion-exchangers. Most of... more There are several naturally existing materials have ability to utilize as ion-exchangers. Most of these materials are by-products of waste material from industry or agriculture. Agriculture ion exchange materials include: lemon orange, grapefruit, apple, peas, broad bean, and meddler peels, kernel core, and grape skins. This research deals with the utilization of agriculture waste biomass of napak seed as natural cation exchanger for removal of cationic pollutant from aqueous solution. Methylene blue dye method was used to determine the cation exchange capacity of the stone and it was characterized by IR and TGA methods. The results showed that the highest dye sorption capacity was found at pH 7, the equilibrium time was 60 min, sorbent dose = 0.1g, particle size 177µm and methylene blue concentration range 10-50 ppm. The equilibrium sorption data were analyzed by Langmuir and Freundlich isotherm models.
ABSTRACT Environmental protection must require the use of natural products instead of chemicals t... more ABSTRACT Environmental protection must require the use of natural products instead of chemicals to minimize pollution. Thus, this investigation studies the use of some plant flowers as naturally occurring acid‐base indicators. We utilized plant flowers of Celosiacristate Linn, Bombax ceiba L., Poincianaregia and Hibiscus subdariffa. These flowers contain anthocyanine pigments whose colour depends on pH; there fore they are used as pH indicators. The acid‐base equilibria of these pigments were investigated using spectro photometric and potentiometric methods. The pk values are 9.6 for Celosiacristate Linn, 5.7 for Bombax ceiba L., 8.6 for Poincianaregia and 2.8 & 7.3 for Hibiscus subdariffa. Experimentation of these indicators on different concentrations of acid‐base titrations in the presence of variable concentrations exhibited similar results as for synthetic indicators.
In order to study the relation of the mobility and distribution of metals between Tamarix parts a... more In order to study the relation of the mobility and distribution of metals between Tamarix parts and their crystal salts – soil system, different experiments were conducted with plant-rich and plant-free soils at the banks of river Nile, Aswan, Egypt. For these purposes, Tamarix top and subsoil samples near and far from the plant were collected from six different locations
ABSTRACT Effluent from dyeing and finishing processes is an important source of water pollution. ... more ABSTRACT Effluent from dyeing and finishing processes is an important source of water pollution. The effectiveness of bentonite, kaolinite and sediment from a local deposit in removing methylene blue as a cationic dye from aqueous solutions has been investigated. The adsorption equilibrium (isotherm) has been determined according to Freundlich and Langmuir equations. The optimum amount is 0.5 g for all adsorbents, and the optimum pH ranges are 2–8 for bentonite and 2–6 for kaolinite and sediment. With respect to kinetic modelling, the adsorption of methylene blue on various adsorbents was fitted to a second-order equation. Also, the thermodynamic parameters were determined. The negative free energy values indicate the feasibility of the process and spontaneous nature of adsorption. The positive ΔH° values indicate the endothermic nature of the process. Thus, Egyptian clay minerals and sediments have a great tendency to remove the dye from solutions.
Mentha Longifolia (ML) and Mentha Puleguim (MP) are usually used as a flavor and medicinal plants... more Mentha Longifolia (ML) and Mentha Puleguim (MP) are usually used as a flavor and medicinal plants in Saudi Arabia. The present study was carried out to compare the potential of methanol extract of fresh leaves of ML and MP as free radical (DPPH) scavenger by fixed point and kinetic methods. In a fixed point method, free radical scavenging capacity was expressed by effective concentration, EC 50. However, in kinetic method, capacity expressed by rate constant value. Some other antioxidants parameters like total flavonoids content and total phenolic content were also estimated. Flavonoid content was obtained as catechin equivalent and total phenolic content as gallic acid equivalent. The obtained results indicate that methanol extract of MP possess a high concentration of flavonoids (6.55± 0.42 mg/100 ml) and of phenolic (3.72 ±0.29 mg/100 ml) compared to that of ML flavonoids (3.22± 0.43 mg/100 ml) and of phenolic (1.91 ±0.06 mg/100 ml).
Green routes for remediation of heavy metals are worldwide challenges to overcome pollution probl... more Green routes for remediation of heavy metals are worldwide challenges to overcome pollution problems on one hand and control the adverse impact of chemicals on the other hand. Biosorption is one of the most effective methods for removing lower level of heavy metals. The idea to apply natural resources as a green method for removal of heavy metals, this route has no adverse impacts on the environment. This study investigated the ability of chemically modified Ziziphus spina-christi stones (ZSCs) as agriculture by-products to perform the biosorption of Pb(II), Zn(II) and Cd(II) ions from wastewater in a single and ternary metal system. The characteristic functional groups of chemically modified ZSCs were analyzed by Fourier transform infrared. In comparison with acidic ZSCs, alkali-modified ZSCs by KOH was more effective and enhanced the removal efficiency of ZSCs. Using Langmuir isotherm, the maximum adsorption capacity on the modified ZSCs for Pb(II) was 9.06 mg/g, for Zn(II) obtain...
Membrane processes for separation of chemical species from a mixture are gaining in importance an... more Membrane processes for separation of chemical species from a mixture are gaining in importance and are emerging as a viable alternative to conventional separation processes. The emulsion liquid membrane (ELM) technique was regarded as an emerging separation technology and was extensively examined for potential applications in such fields as hydrometallurgy, environmental engineering, biochemical engineering, pharmaceutical engineering, and food technology. In the present work, the removal of Cerium ions from acidic solution by using an emulsion liquid membrane (ELM) technique was investigated and we obtained > 98% efficiency with the treatment. For the transport of Ce(III) ions using Cyanex 301 as extractant, the effects of extractant and surfactant concentrations, mixing speed, concentration and type of stripping solution, phase ratio, treatment ratio, and nature of diluent on the extraction rate were studies. Under the optimum conditions, solvent extraction and stripping of ...
The efficiency of grounded date stone (Phoenix dactylifera L.) as biosorbent for water remediatio... more The efficiency of grounded date stone (Phoenix dactylifera L.) as biosorbent for water remediation was investigated. The sorption of Saudi Arabia date stones is supposed to take place mainly by electrostatic attraction between negatively charged stones surface and metals. The stone surface is negative because of translocation of sugars and proteins (containing N, S and P) from dates to stones. Various physicochemical parameters that influence the speciation and mobility of metal contaminants such as pH, contact time, adsorbent mass, and adsorbate initial concentration was applied. The general trend is that the metal uptake increases when the pH increases.
There are several naturally existing materials have ability to utilize as ion-exchangers. Most of... more There are several naturally existing materials have ability to utilize as ion-exchangers. Most of these materials are by-products of waste material from industry or agriculture. Agriculture ion exchange materials include: lemon orange, grapefruit, apple, peas, broad bean, and meddler peels, kernel core, and grape skins. This research deals with the utilization of agriculture waste biomass of napak seed as natural cation exchanger for removal of cationic pollutant from aqueous solution. Methylene blue dye method was used to determine the cation exchange capacity of the stone and it was characterized by IR and TGA methods. The results showed that the highest dye sorption capacity was found at pH 7, the equilibrium time was 60 min, sorbent dose = 0.1g, particle size 177µm and methylene blue concentration range 10-50 ppm. The equilibrium sorption data were analyzed by Langmuir and Freundlich isotherm models.
ABSTRACT Environmental protection must require the use of natural products instead of chemicals t... more ABSTRACT Environmental protection must require the use of natural products instead of chemicals to minimize pollution. Thus, this investigation studies the use of some plant flowers as naturally occurring acid‐base indicators. We utilized plant flowers of Celosiacristate Linn, Bombax ceiba L., Poincianaregia and Hibiscus subdariffa. These flowers contain anthocyanine pigments whose colour depends on pH; there fore they are used as pH indicators. The acid‐base equilibria of these pigments were investigated using spectro photometric and potentiometric methods. The pk values are 9.6 for Celosiacristate Linn, 5.7 for Bombax ceiba L., 8.6 for Poincianaregia and 2.8 & 7.3 for Hibiscus subdariffa. Experimentation of these indicators on different concentrations of acid‐base titrations in the presence of variable concentrations exhibited similar results as for synthetic indicators.
In order to study the relation of the mobility and distribution of metals between Tamarix parts a... more In order to study the relation of the mobility and distribution of metals between Tamarix parts and their crystal salts – soil system, different experiments were conducted with plant-rich and plant-free soils at the banks of river Nile, Aswan, Egypt. For these purposes, Tamarix top and subsoil samples near and far from the plant were collected from six different locations
ABSTRACT Effluent from dyeing and finishing processes is an important source of water pollution. ... more ABSTRACT Effluent from dyeing and finishing processes is an important source of water pollution. The effectiveness of bentonite, kaolinite and sediment from a local deposit in removing methylene blue as a cationic dye from aqueous solutions has been investigated. The adsorption equilibrium (isotherm) has been determined according to Freundlich and Langmuir equations. The optimum amount is 0.5 g for all adsorbents, and the optimum pH ranges are 2–8 for bentonite and 2–6 for kaolinite and sediment. With respect to kinetic modelling, the adsorption of methylene blue on various adsorbents was fitted to a second-order equation. Also, the thermodynamic parameters were determined. The negative free energy values indicate the feasibility of the process and spontaneous nature of adsorption. The positive ΔH° values indicate the endothermic nature of the process. Thus, Egyptian clay minerals and sediments have a great tendency to remove the dye from solutions.
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