生态与农村环境学报2016，Vol.32Issue(6)：986-991,6.DOI:10.11934/j.issn.1673-4831.2016.06.018
凹凸棒石和海泡石对镉离子的吸附效果
Effects of Attapulgite and Sepiolite Adsorbing Cadmium in Aqueous Solution
摘要
Abstract
Effects of attapulgite and sepiolite adsorbing Cd2+ in aqueous solutions relative to initial concentration, solid⁃liquid ratio, exposure duration, and pH were investigated through a static batch experiment under a set NaNO3 ionic strength (0�01 mol·L-1). Results show that, under the set NaNO3 ionic strength, Cd2+ adsorption of sepiolite and at⁃tapulgite of high grade and attapulgite of low grade is positively related to initial concentration of Cd2+ in the solution, but negatively to solid⁃liquid ratio of the solution. Fitting with the Langmuir isothermal adsorption equation reveals an order of high grade attapulgite ( 33�67 mg·g-1 )>high grade sepiolite ( 25�55 mg·g-1 ) >low grade attapulgite( 11�52 mg·g-1 )>low grade sepiolite (5�24 mg·g-1) in terms of theoretical saturated Cd2+adsorption;Cd2+adsorption on sepiolite and at⁃tapulgite is strongly influenced by pH of the solution, and peaks when pH is 2-4; Cd2+ adsorption on attapulgite is rela⁃tively stable and reaches equilibrium basically in 3 h;in solutions 0�01 mol·L-1 NaNO3 in ionic strength, 625 mg·L-1 in initial Cd2+ concentration, 15 g·L-1 in clay mineral addition amount and 2-4 in pH, the minerals display an order of high grade sepiolite> high grade attapulgite> low grade attapulgite>low grade sepiolite in terms of Cd removal efficiency.关键词
海泡石/凹凸棒石/吸附/镉Key words
sepiolite/attapulgite/adsorption/cadmium分类
资源环境引用本文复制引用
王荐,李仁英,何跃,吴运金,焦少俊,赵莉..凹凸棒石和海泡石对镉离子的吸附效果[J].生态与农村环境学报,2016,32(6):986-991,6.基金项目
中央级公益性科研院所基本科研业务专项（2015038）；中国科学院盱眙凹土应用技术研发与产业化中心开放性课题 （）
