巯基化改性膨润土对重金属的吸附性能

以钙基膨润土为基本材料,制备了巯基化改性膨润土,并对比研究了此材料与其他17种改性膨润土和原材料对重金属的吸附性能.结果表明,巯基化膨润土对镉的吸附能力显著优于其他材料,在本实验条件下,其对镉的吸附率高于其他材料30％以上,对镉的吸附量可达52.1 mg/g.巯基化膨润土对铅的吸附能力在重金属竞争吸附条件下优于其他材料,而其对镍的吸附能力在所有材料中处于中等水平;另外,巯基化膨润土对3种重金属的吸附受重金属竞争吸附影响较小.因此,在所研究的材料中,巯基化膨润土材料是一种最理想的重金属吸附材料.

Adsorption properties of thiol-functionalized bentonite for heavy metals

Based on Ca-bentonite, a novel kind of thiol-functionalized bentonite was obtained. And a study was conducted to compare this material with other 17 kinds of modified bentonite and Ca-bentonite for heavy metal adsorption properties. The results showed that the adsorption capacity of thiol-functionalized bentonite for Cd²⁺ is the best, which is 30% higher than the others, and its saturated adsorption capacity for Cd²⁺ is up to 52.1 mg/g. The influences of all the 19 kinds of materials on the adsorption characteristics of Cd²⁺, Pb²⁺ and Ni²⁺ were studied in competitive adsorption condition. As shown by the experimental results, the adsorption capacity of thiol-functionalized bentonite for Pb²⁺ is obviously better than the others, and middle level for Ni²⁺ in all the studied materials. In addition, the adsorption capacity of thiol-functionalized bentonite for Cd²⁺, Pb²⁺ and Ni²⁺ has the least influence by competitive adsorption. Therefore, the thiol-functionalized bentonite is the most ideal adsorbent for heavy metal ions of all the studied materials.