天然膨润土还原吸附Cr(Ⅵ)  

Reduction Adsorption of Cr(Ⅵ) on Natural Bentonite

作　　者：罗平[1] 田英[1] 

机构地区：[1]南京工业大学环境学院,江苏南京210009

出　　处：《化工环保》2013年第1期6-9,共4页Environmental Protection of Chemical Industry

摘　　要：以天然膨润土为吸附剂,还原吸附处理含Cr(Ⅵ)模拟废水。实验结果表明:以(NH4)2FeSO4为还原剂吸附效果最佳;在还原剂加入量为理论值的0.8倍、膨润土加入量为6 g/L、吸附时间为30 min、吸附温度为30℃、初始Cr(Ⅵ)质量浓度为1 mg/L的条件下,Cr(Ⅵ)去除率可达99.6%,处理后模拟废水中总铬质量浓度低至0.003mg/L。天然膨润土对Cr(Ⅵ)的还原吸附符合准二级动力学模型及Freundlich等温吸附模型。Natural bentonite was used as adsorbent in the reduction adsorption treatment of simulated Cr（VI）-containing wastewater. The experimental results show that： When （NH4）2FeSO4 is used as reducing agent, the adsorption effect is the best; When the dosage of reducing agent is 0.8 time of the theoretical value, the dosage of bentonite is 6 g/L, the adsorption time is 30 min, the adsorption temperature is 30 ℃ and the initial Cr（Ⅵ） mass concentration is 1 mg/L, the Cr（Ⅵ） removal rate can reach 99.6% and the total Cr mass concentration of the treated wastewater can be as low as 0.003 mg/L. The reduction adsorption of Cr（VI） on natural bentonite accords with pseudo-second-order kinetic model and Freundlich isothermal adsorption model.

关 键 词：天然膨润土 铬 还原 吸附 废水处理 

分 类 号：X524[环境科学与工程—环境工程]