pH和络合剂对五价锑在水钠锰矿和水铁矿表面吸附行为的影响  

Effects of pH and Complexing Agents on Sb(Ⅴ) Adsorption onto Birnessite and Ferrihydrite Surface

作　　者：王华伟[1] 李晓月[1] 李卫华[1] 孙英杰[1] WANG Hua-wei LI Xiao-yue LI Wei-hua SUN Ying-jie(School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, Chin)

机构地区：[1]青岛理工大学环境与市政工程学院,青岛266033

出　　处：《环境科学》2017年第1期180-187,共8页Environmental Science

基　　金：国家自然科学基金项目(51678315)

摘　　要：研究了pH和络合剂对Sb(Ⅴ)在水钠锰矿和水铁矿表面吸附性能的影响.结果表明,水钠锰矿和水铁矿对Sb(Ⅴ)有良好的去除效果,初始pH显著影响水钠锰矿和水铁矿对Sb(Ⅴ)的去除效率.随着初始pH值的降低,水钠锰矿和水铁矿对Sb(Ⅴ)的去除率显著增加.在初始pH 5.0时,Sb(Ⅴ)的去除率、吸附速率和吸附量要优于pH 7.0和9.0.Sb(Ⅴ)在水钠锰矿和水铁矿表面的吸附行为符合准二级动力学模型.在初始pH 5.0时,Langmuir模型可以较好地描述Sb(Ⅴ)在水钠锰矿和水铁矿表面的吸附过程.柠檬酸和乙二胺四乙酸(EDTA)两种络合剂显著抑制了Sb(Ⅴ)在水钠锰矿和水铁矿表面的吸附效果.Effects of pH and complexing agents on Sb（ Ⅴ） adsorption onto birnessite and ferrihydrite surface were investigated. The results indicated that birnessite and ferrihydrite had strong ability to adsorb Sb（ Ⅴ）. The removal efficiencies of Sb（ Ⅴ） by birnessite and ferrihydrite were dependent on the initial pH in solution. The removal efficiency of Sb（ Ⅴ） increased with the decrease of solution pH. At pH 5. 0,the removal efficiencies,adsorption rate and adsorption capacity were better than those at pH 7. 0 or 9. 0. The adsorption process of Sb（ Ⅴ） on birnessite and ferrihydrite could be well described by the pseudo-second-order model. The Langmuir model best described the adsorption behavior of Sb（ Ⅴ） by birnessite and ferrihydrite at pH 5. 0. The presence of citric acid or EDTA had significant effect on Sb（ Ⅴ） adsorption onto birnessite and ferrihydrite.

关 键 词：五价锑 吸附行为 水铁矿 水钠锰矿 PH 络合剂 

分 类 号：X703.1[环境科学与工程—环境工程]