表面活性剂改性膨润土吸附Cr(VI)的研究

Removal of Cr(VI) from aqueous solution by adsorption on modified bentonite

研究了膨润土原土及2种经不同表面活性剂改性的膨润土在不同的pH值、不同的用量等条件下对Cr(VI)的吸附情况,以及3种土达到吸附平衡所需的时间.还研究了3种土对Cr(VI)的等温吸附.结果表明,1827改性的膨润土吸附效果好,平均去除率为93%,且几乎不受pH值和时间的影响.其中2种改性膨润土对Cr(VI)的吸附为Freundlich吸附.

Two kinds of modified bentonite were prepared with different surfactant. Experiments were made on removal Cr(VI) from aqueous solution with the original bentonite and modified bentonite .The optimum Cr(VI)-absorbing conditions and adsorption isotherms of these three samples were investigated in detail. The result show that 1827-bentonite have high removal rate without the effect of pH and time. The adsorption isotherms of two modified bentonite are of Freundlich-type.