Study on the removal of As(Ⅲ)from water by modified coconut shell activated carbon loaded with iron/silver bimetals
Modified coconut shell activated carbon loaded with iron/silver bimetals(FeAg@AC)was prepared by pyrolysis,and its adsorption properties to As(Ⅲ)in water were studied.The characterization results revealed successful loading of Fe0 and Ag0 on the activated carbon in the form of nanospheres with particle sizes ranging from 10-100 nm.During the As(Ⅲ)removal process,Fe0 acted as an electron donor,Ag0 functioned as a catalyst.Ultimately,arsenic was attached to the surface of FeAg@AC in the form of As(Ⅴ).The results of adsorption experiments revealed that the removal rate of As(Ⅲ)by FeAg@AC could reach 92.10％under the conditions of initial As(Ⅲ)mass concentration of 11.03 mg/L,pH=7 and reaction time of 24 h.However,the presence of PO43-and CO32-showed inhibitory effects on the removal of As(Ⅲ).The removal of As(Ⅲ)exhibited a better fit to the Freundlich model and pseudo-second-order kinetic model,indicating that chemisorption played a dominant role in the process.
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