Papers by Shaimaa El Wakeel
Polymer Bulletin, Apr 18, 2023
Water Environment Research, 2022
Removal of selenite (Se (IV)) from wastewater is vital due to its more toxic and mobile propertie... more Removal of selenite (Se (IV)) from wastewater is vital due to its more toxic and mobile properties. In this study, a novel dendritic silver‐dendrites@ copper with hierarchical side‐branches were synthesized through a two‐pot rapid, facile, and green precipitation route. Characterization of the dendrites by transmission electron microscope (TEM), scanning electron microscope (SEM), dynamic light scattering (DLS), and X‐ray diffraction spectroscopy (XRD) confirmed the proper preparation of dendritic AgCu nanostructure. Significantly, the Ag@Cu nanostructure has high specific surface area (150 m2/g) and excellent adsorption activity toward selenite. The adsorption rate of Se (IV) on the dendritic AgCu reaches 94% within 60 min under normal adsorption procedures. Both adsorption kinetics and isotherms have been described well by the pesudo‐second order model and Langmuir model, respectively. The noticeable high adsorption capabilities can mainly accredit to the effect of the hierarchical side‐branched structure. Therefore, the dendritic AgCu nanostructure has a room of treating heavy metals‐contaminated industrial wastewater streams.
Journal of Environmental Chemical Engineering, 2015
Biosorption and desorption studies on chromium(VI) by novel 2 biosorbents of raw rutin and rutin ... more Biosorption and desorption studies on chromium(VI) by novel 2 biosorbents of raw rutin and rutin resin 3
Desalination, 2010
... Nickel, Significance of contact time, P < 0.0001, P < 0.0001. Zinc, Significanc... more ... Nickel, Significance of contact time, P < 0.0001, P < 0.0001. Zinc, Significance of contact time, P < 0.0001, P < 0.0001. Full-size table. View Within Article. ... (4) revealed that the removal of heavy metals increased with increasing the zeolite dose. Adsorption of Cd, Cu, Pb, Ni and Zn ...
DESALINATION AND WATER TREATMENT, 2021
In this study iron waste from the steel industry and eggshells biomass were used to prepare the e... more In this study iron waste from the steel industry and eggshells biomass were used to prepare the environmentally-friendly magnetic hydroxyapatite composite. The prepared composite was characterized and applied for Pb(II), Hg(II) and As(III) removal from aqueous solution. Batch experiments show the adsorption capacity to be 348.3, 291.4 and 266.2 mg/g for Pb(II), Hg(II) and As(III) respectively, by applying the different isotherm models and the second-order kinetic model described well the adsorption process. Metals regeneration and the reuse of the prepared composite up to four cycles were obtained. The results revealed that the prepared composite synthesized from eggshell and iron waste could be an effective and economically viable adsorbent for Pb(II), Hg(II) and As(III) ions.
International Journal of Environmental Science and Technology
Pollution by highly toxic contaminants poses a great threat to the aquatic environment and human ... more Pollution by highly toxic contaminants poses a great threat to the aquatic environment and human life. Bimetallic materials have been proven to be efficient for the removal of such contaminants. In this study, the bimetallic Fe0/Ni0/alginate beads have been prepared using solvothermal technique followed by polymerization of alginate. Full-factorial design has been utilized to optimize the preparation conditions including the weight ratios of Fe and Ni, and time of the solvothermal process. The bimetal made from equal weights of Ni and Fe metals along with alginate has shown the best efficiency for the removal of 2,4,6-trichlorophenol (2,4,6-TCP, ~ 70%) as a model organic pollutant under acidic conditions (pH = 2) with minor contribution of alginate component in the removal process. Adsorption followed by reduction has been defined as the removal mechanism using GC/MS/MS chromatography in the case of 2,4,6-TCP. A mathematical model was established to describe the 2,4,6-TCP removal by...
RSC Advances
This study reports the preparation of a new material that can remove synthetic dyes and trace met... more This study reports the preparation of a new material that can remove synthetic dyes and trace metals simultaneously.
Microporous and Mesoporous Materials
From the spent pickle liquor, magnetite nanoparticles (Fe3O4NPs) with high crystallinity and high... more From the spent pickle liquor, magnetite nanoparticles (Fe3O4NPs) with high crystallinity and high saturation magnetization were prepared by hydrothermal process. The characteristics of the materials, prepared via different hydrothermal time durations, were investigated by X-ray diffraction (XRD), high-resolution transmission electron microscope (HR-TEM), Energy-dispersive X-ray (EDX), and vibrating sample magnetometry (VSM)techniques. The adsorption behavior forthe prepared materials towards Pb 2+ metal ionswas also studied. Moreover, equilibrium data were modeled using Freundlich, Langmuir, Temkin and Dubinin–Radushkevich equations. On the other hand, the adsorption kinetics were tested by pseudo first-order and pseudo second-order rate equations.To sum up, a well crystalline face centered cubic structure superferromagnetic Fe3O4NPswas obtained. The adsorption of Pb 2+ is a pseudo second-order rate process and follows Langmuir isotherm model with arelatively high calculated maximum...
Environmental Science and Pollution Research, 2020
This is the first study on the biosorption of Cu 2+ and reactive yellow 145 (RY145) dye by citric... more This is the first study on the biosorption of Cu 2+ and reactive yellow 145 (RY145) dye by citric acid (CA), NaOH, and heattreated Chlorella vulgaris (Cv). Influence of contact time, initial adsorptive concentration, and biomass dosage on the biosorption process was explored. The biosorption kinetics and isotherm were comprehensively investigated as well. The Fourier transform infrared analysis proved the successful insertion of carbonyl groups on Cv surface by CA modification and the intensification of all Cv functional groups by heat treatment. CA modified Cv was the best biosorbent for RY145, 0.5 g/L removes 97% of 10 mg/L solution (pH i 2) in 40 min. The biosorption was favorable, occurred via the formation of a monolayer of RY145 on the homogenous surface of CA-modified Cv and followed the pseudo-second-order kinetics. On the other hand, heat-treated Cv was the best biosorbent for Cu 2+ , 0.5 g/L removes 92% of 10 mg/L solution (pH i 5) in 5 min. The biosorption of Cu 2+ on heattreated Cv was complex and involves more than one mechanism. The Langmuir theoretical monolayer saturation capacity of RY145 on CA-modified Cv was comparable to other biosorbents, while that of Cu 2+ on heat-treated Cv was drastically superior.
Egyptian Journal of Aquatic Biology and Fisheries, 2020
The emission of heavy metals into the environment may be natural or anthropogenic (Taghipour and ... more The emission of heavy metals into the environment may be natural or anthropogenic (Taghipour and Mosaferi, 2013). Anthropogenic impacts including industrial discharge, domestic sewage, non-point source runoff and atmospheric precipitation are the main sources of toxic heavy metals that enter aquatic systems ﴾Langston et al., 1999﴿. Heavy metals are bio-accumulated in living organisms when taken up and stored more than softened (metabolized) or excreted (Gupta, 2013). Heavy metals toxicity has been reportable to be caused by completely different means; e.g., from contamination of drinking-water (Pb pipes), high air concentrations close to emission sources (thus enter into soil) or from food chain. The heavy metals are poisonous as the result of the bio-accumulation (Lenntech, 2012; Gupta, 2013 & Chibuike and Obiora, 2014). The Nile in Egypt facing major environmental problems associated with the dispersal or disposal of agricultural, industrial and urban wastes generated by human activities (Abdel-Mohsien and Mahmoud, 2015).
Heliyon, 2019
Silver nanoparticles (AgNPs) and silver/quartz nanocomposite (Ag/Q)NPs)) were synthesized by sol-... more Silver nanoparticles (AgNPs) and silver/quartz nanocomposite (Ag/Q)NPs)) were synthesized by sol-gel method using table sugar as chelating agent. The synthesized nanosized materials were used for mercury ions adsorption from aqueous solutions. The materials were characterized by X-ray diffraction (XRD), Transmission Electron microscope (TEM), and surface area (BET). Adsorption of Hg 2þ (10 mg/l) is strongly dependent on time, initial metal concentration, dose of adsorbent and pH value. Silver/quartz nanocomposite ((Ag/Q)NPs)) shows better efficiency than individual silver nanoparticles (AgNPs). This composite removed mercury ions from the aqueous solution with efficiency of 96% at 60 min with 0.5g adsorbent dosage at pH 6. The adsorption process explained well by the pseudo-second-order kinetic model. In conclusion silver/quartz nanocomposite (Ag/Q)NPs)) shows higher removal efficiency for mercury ions from aqueous solutions than individual silver naoparticles (AgNPs) or quartz (Q).
Water Science and Technology, 2019
Sol-gel auto-combustion technique was used to synthesize spinel ferrite nanoparticles of Mn0.2Co0... more Sol-gel auto-combustion technique was used to synthesize spinel ferrite nanoparticles of Mn0.2Co0.8Fe2O4 (MCF). Using the modified Stöber method, these magnetic nanoparticles were encapsulated with silica to form the core/shell Mn0.2Co0.8Fe2O4/SiO2 (MCFS). The phase composition, morphology, particle size, and saturation magnetization of the encapsulated nanoparticles were studied using X-ray diffraction (XRD), high resolution-transition electron microscopy (HR-TEM), and vibrating sample magnetometer (VSM). HR-TEM images indicated that particle size of the nanoparticles ranged from 15 to 40 nm, and VSM measurements showed that Ms of uncoated and coated samples were 65.668 emu/g and 61.950 emu/g and the Hc values were 2,151.9 Oe and 2,422.0 Oe, respectively. The effects of metal concentration, solution pH, contact time, and adsorbent dose of the synthesized nanoparticles on lead (Pb2+) ions removal from an aqueous solution were investigated. Based on Langmuir isotherm model, the resul...
Journal of Dispersion Science and Technology, 2018
This study was conducted to understand and optimize the activation process for the production of ... more This study was conducted to understand and optimize the activation process for the production of a low-cost activated carbon (AC) using a renewable and plentiful biomass waste, pinecones. This was achieved by tracking the changes in porous structure, surface chemistry and adsorption properties of the AC produced using different activating agents, activation temperatures, holding times and heating rates. Generally, produced ACs were predominantly microporous with small external surface area and were different in terms of H/C and O/C ratios. Study of Pb 2þ cations adsorption on these samples proved the high affinity of the pinecones derived ACs to this cation. The best adsorption behaviour was recognized in sample prepared by impregnation with H 3 PO 4 at weight ratio of 2, then heating at 400 C for 2 h at 5 C/min heating rate. This sample possessed the highest BET surface area (1335 m 2 /g). The adsorption process obeyed the pseudo-first-order and Freundlich model slightly better than the pseudo-second-order kinetics and Langmuir model. The high Langmuir maximum adsorption capacity of 418 mg/g supports the applicability of the produced AC for the removal of Pb 2þ cations from wastewater.
Scientific Reports, 2019
Dead leaves of seagrass Posidonia oceanica were activated by using one mol L−1 acetic acid and us... more Dead leaves of seagrass Posidonia oceanica were activated by using one mol L−1 acetic acid and used as an eco-adsorbent for the removal of methylene blue (MB) and Pb2+ from aqueous solutions. The seagrass was characterized by chemical and physical measurements that confirmed the acid-activation of seagrass. The favourable conditions for MB and Pb2+ adsorption onto the activated seagrass (SGa) were determined to be a pH range of 2–12 and ≥6, an adsorbent dosage of 3.0 and 0.5 g L−1, respectively, and a shaking time of 30 min, which are suitable for a wide range of wastewaters. The equilibrium data were analysed using the Langmuir, Freundlich and Dubinin-Raduskavich-Kaganer (DRK) adsorption isotherm models. The Freundlich and DRK models best describe the adsorption processes of MB and Pb2+, on SGa with capacities of 2681.9 and 631.13 mg g−1, respectively. The adsorption isotherm fitting and thermodynamic studies suggest that the adsorption mechanism of MB may combine electrostatic and...
Cellulose, 2018
In this work, a fixed amount of acrylamide and different amounts of acrylic acid were grafted on ... more In this work, a fixed amount of acrylamide and different amounts of acrylic acid were grafted on carboxymethyl cellulose (CMC) to get a nanosized gel with enhanced adsorption capacity. Successful grafting was demonstrated by FTIR and XRD analysis. By increasing the concentration of the grafting reactants, the average particle size of the prepared gels was reduced according to TEM and particle size analysis. The adsorption studies declared that 0.5 g/L of the prepared gel can almost completely remove Cd(II) (20 mg/L, pH 6) within 5 min; whilst, gel of 2 g/L can remove up to 90% of RR195 dye solution (10 mg/L, pH 2) in 5 min. As a result, the adsorption process followed the pseudo-first and second-order kinetic for RR195 dye and Cd(II), respectively. For both adsorptives, the isotherm data was best described by Langmuir model which revealed that the prepared gel has a significantly high adsorption capacity (595.92 mg/g) for Cd(II) from wastewater. The authors Emad K. Radwan and Hany Kafafy are equally contributed to this work.
Environmental Nanotechnology, Monitoring & Management, 2018
Presently, there is increased attention and focus on heavy metals due to their adverse health eff... more Presently, there is increased attention and focus on heavy metals due to their adverse health effects. The purpose of this work was to fabricate ZnO@Chitosan core/organically shell nanocomposite (ZOCS) to remove Pb(II), Cd (II) and Cu(II) ions from polluted water. The results of adsorbent characterization by TEM, FE-SEM, EDX and FTIR revealed the formation of round shape particles with average size 58 nm. The optimum removal efficacy for Cu(II), Pb(II) and Cd(II) was recorded at pH 4, 6 and 6.5, respectively. According to Langmuir isotherm model, the metal ions adsorption capacity were 476.1, 135.1 and 117.6 mg/g, for Pb(II),Cd(II) and Cu(II) respectively. Continuous adsorption-desorption cyclic results demonstrated that ZOCS NC can be reused after recovery of ions by disodium salt of EDTA solution, and the renovated ZOCS can be used many times without significant efficiency loss satisfied the increasing need for the purification of water resources.
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Papers by Shaimaa El Wakeel