Both of Fe Cl3·6H2O and Zr OCl2·8H2O were exploited for preparation of composite modified bentonite( Fe /Zr-Bent) by the method of hydrothermal synthesis. And it was used to adsorb selenium in aqueous solution. Parameters included kinds of bentonite before and after modification,initial p H value,dosage,temperature,initial concentration,kinds and concentration of foreign ions,were investigated,which influence on adsorption of selenium in aqueous solution using Fe / Zr-Bent. Stability of selenium among Fe / ...