关键词: 类水滑石;As(V);吸附

Abstract: A calcined Ca-Mg-Al hydrotalcite-like compound was synthesized for adsorption of As(V). The adsorption performances of As(V)on calcined Ca-Mg-Al hydrotalcite-like compound have been studied by the adsorption kinetics and adsorption isotherms.The characterization of synthetic materials and adsorption mechanism have been analyzed by the X-ray diffraction(XRD),specific surface area and pore size(BET), field emission scanning electron microscopy(FESEM), Fourier transform infrared spectrometer(FTIR)and X-ray photoelectron spectroscopy(XPS)techniques.The results indicate that the calcined Ca-Mg-Al hydrotalcite-like compound has a high adsorption capacity for As(V)with maximum adsorption capacity of 71.86 mg/g and the adsorption behavior followed the Freundlich adsorption isotherm and fitted well to the pseudo-first-order kinetics.In addition,the adsorbent also has great adsorption capacity at different pH value.The adsorption mechanism of calcined Ca-Mg-Al hydrotalcite-like compound for adsorption of As(V)mainly includes the reconstruction of Ca-Mg-Al hydrotalcite-like compound crystal structure and the complexation of the surface hydroxyl groups.

Key words: hydrotalcite-like;As(V);adsorption