Adsorption Behavior of Arsenic and Selenium using NiZn Hydroxy Double Salts with Acetate, Chloride, Nitrate and Sulfate Anions

Arsenic(As) and selenium(Se) has become an increasingly serious water contamination worldwide, so the development of adsorbents to improve the adsorption performance of As and Se oxyanions is desired.In this study, NiZn adsorbents intercalated acetate, chloride, nitrate, and sulfate anions to interlayers of NiZn hydroxy double salts were prepared and their adsorption behavior of As and Se oxyanions was investigated.The Langmuir isotherm model, characteristic of monolayer adsorption, fit the experimental data well with R 2 >0.94.The adsorption capacity(qmax) of Se(IV) was the other NiZn-AcO ≈ NiZn-Cl > NiZn-NO3 > NiZn-SO4 and that of Se(VI) was the order of NiZn-Cl > NiZn-AcO > NiZn-NO3 > NiZn-SO4.The qmax of as(V) on NiZn-Cl was about twice as large as that on NiZn-AcO, NiZn-NO3 and NiZn-SO4.NiZn-Cl was found to adsorb As(V) and Se(VI) oxyanions more efficient than NiZn-AcO.