摘要
研究了腐殖酸对六价铬在砂土介质中吸附作用的影响.进行了反应接触时间、pH、HA投加量等对反应的影响研究,确定了最佳反应条件.并阐述了腐殖酸、铬离子和砂土之间相互作用的机理.结果表明:砂土对六价铬的吸附随着溶液pH值的升高而减弱,pH3时去除率仅有22%;但当溶液中存在腐殖酸时,砂土对六价铬吸附能力明显增强,增强了30%,作用机理主要是由于酸性条件下腐殖酸易与铬络合,其络合物与砂土颗粒有较强的结合能力,增强了砂土对六价铬的吸附能力.
Influence of humic acid on adsorption of hexavalent chromium in the sandy matrix was investigated. Effects of reaction time, pH, concentrations of HA and adding amount were studied. The reduction of Cr（Ⅵ） was examined while the optimum reaction conditions were determined. The adsorption experiment indicated that the adsorption of pure heavy metal by sand decreased while pH increased, and pH3, the removal rate was only 22%. However the present of humic acid could enhance the adsorption of Cr（Ⅵ） because of the competitive adsorption with heavy metal ions in the acidic condition when the complexion reaction between HA and Cr（Ⅵ） occurred. The reaction mechanisms of humic acid with chromium and sand surfaces were certified.
出处
《兰州交通大学学报》
CAS
2005年第4期67-71,共5页
Journal of Lanzhou Jiaotong University
关键词
腐殖酸
六价铬
砂土
络合作用
吸附
humic acid
hexavalent chromium
sand
complexion
adsorption
