Zusammenfassung
An L-cysteine functionalized environmentally friendly adsorbent was synthesized via sol-gel processing and applied in the removal of As(V) from aqueous media. The adsorbent demonstrated enhanced As(V) uptake capacities with maximum uptake of 147.5 mg g(-1) at pH 3. Equilibrium was reached at 120 min. Kinetic data were explained by a pseudo-second order model; isotherm data were fitted by a ...
Zusammenfassung
An L-cysteine functionalized environmentally friendly adsorbent was synthesized via sol-gel processing and applied in the removal of As(V) from aqueous media. The adsorbent demonstrated enhanced As(V) uptake capacities with maximum uptake of 147.5 mg g(-1) at pH 3. Equilibrium was reached at 120 min. Kinetic data were explained by a pseudo-second order model; isotherm data were fitted by a Freundlich model. Reuse of adsorbent after 5 adsorption/desorption cycles indicated similar to 23% removal capacity loss. Elemental analysis results indicated high ligand densities of SG-3PS-Cys. The L-cysteine moieties were thermally stable up to similar to 170 degrees C. Solid state NMR and XPS techniques confirmed the presence of cysteine on the surface of SG-3PS-Cys. Efficient adsorption of As(V) was ensured by the formation of a bidentate complex between the AsO2(OH)(2)(-) anion, the NH3+ and carboxyl groups of L-cysteine. The results of this work demonstrated that SG-3PS-Cys possesses potential in the removal of As(V) from industrial wastewater discharges.
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