Abstract
Layered double hydroxides (LDHs) have attracted significant attention in the removal of oxyanions due to their large surface area and excellent thermal stability. However, the electrostatic repulsion of the same charges causes a poor adsorption effect of LDH for oxyanions. Additionally, the selectivity of LDH for specific oxyanion remains poor. To improve its adsorption effect and selectivity, glycine-modified Fe/Zn-LDH (GFeZn) was prepared. The GFe1Zn1, with a Fe/Zn mole ratio of 1:1, achieved excellent selectivity for As(V). Langmuir isotherms model and pseudo-second-order kinetics model were followed in the adsorption of GFe1Zn1 for As(V). The saturated adsorption capacity for As(V) reaches 859.52 mg·g−1, while the adsorption equilibrium was established between 60 and 120 min. GFe1Zn1 has excellent reusability on the adsorption of As(V). The adsorption capacity decreased by about 13.30% in 5 adsorption/desorption cycles. This study offers a new method to remove As(V) from polluted water selectively.
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Yin, C., Wang, C. & Hu, Q. Selective removal of As(V) from wastewater with high efficiency by glycine-modified Fe/Zn-layered double hydroxides. Adv Compos Hybrid Mater 4, 360–370 (2021). https://doi.org/10.1007/s42114-021-00214-3
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DOI: https://doi.org/10.1007/s42114-021-00214-3