摘要
采用静态吸附和动态过滤的试验方法研究了涂铁石英砂(IOCS)滤料对水中Cr(Ⅵ)的去除,并探讨其吸附机理。研究结果表明,Cr(Ⅵ)在IOCS上的吸附平衡符合Langmu ir吸附模型。经氧化铁改性滤料表面电位带正电荷,对水中的Cr(Ⅵ)有良好的去除效果。pH值对Cr(Ⅵ)的去除影响较大,随着溶液的pH值升高,滤料表面电位减小,Cr(Ⅵ)的吸附率也减小。IOCS滤料去除Cr(Ⅵ)机理主要为静电吸附。
The technology including static adsorption and dynamic fikration was adopted to study the removal of Cr（Ⅵ） from water using iron oxide coated sand （IOCS） as filtration media as well as its mechanism. The results showed that the adsorption of Cr（Ⅵ） on 10CS can be fitted to the Langmuir models. IOCS has a favorable filtrating effect attributed to the positive charge on its surface. The pH value highly affected the Cr（Ⅵ） removal. Actually, the adsorption rate of Cr（Ⅵ） decreased with the increase of pH value and sequential decrease of potential on filtration media surface. This study indicates that electrostatic interaction is the dominating mechanism of Cr（Ⅵ） adsorption on IOCS.
出处
《四川环境》
2009年第4期20-22,27,共4页
Sichuan Environment
