零价纳米铁处理水中Cr(Ⅵ)的实验研究  

Cr(Ⅵ)Removal from Aqueous Solution with Nanoscale Zero-valent Iron

作　　者：冯婧微[1,2] 梁成华[1] 王黎[2] 

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110161 [2]沈阳化工大学环境与生物工程学院,辽宁沈阳110142

出　　处：《环境科学与技术》2011年第10期164-167,共4页Environmental Science & Technology

基　　金：国家科技重大专项(2008ZX07528-006-2)

摘　　要：采用NaBH4还原Fe3+制备纳米级零价铁(NZVI)。运用X射线衍射(XRD)、扫描电镜(SEM)对样品进行表征。以C(rⅥ)为研究对象,批实验考察了初始浓度、纳米铁投加量、温度对去除效果的影响,研究NZVI对C(rⅥ)离子的吸附动力学。结果表明,NZVI加入量0.15 g/L,水体中20 mg/L的C(rⅥ)的去除率大于99.5%(210 min)。NZVI对C(rⅥ)的吸附过程符合准二级动力学方程,最大吸附量为198.02 mg/g。实验结果显示,该吸附剂在废水除铬领域具有较好的应用前景。Nanoscale zero-valent iron（NZVI）was synthesized in aqueous solutions by reduction of Fe3＋ with NaBH4.The samples were characterized with XRD and SEM.Adsorption of Cr（Ⅵ） ions on NZVI was investigated to understand the effect of dosages of NZVI,initial concentrations of C（rⅥ）ions and temperature on the adsorption kinetics.It was found that removal efficiency of C（rⅥ）containing 20.0 mg/L was higher than 99.5% with NZVI adsorbent 0.15 g/L and contact time 210 min.Kinetics of Cr（Ⅵ） removal was found to follow the pseudo-second-order rate equation,with the maximal adsorption capacity of 198.02 mg/g.The experimental data showed that the new type of adsorbent is very attractive for removal of C（rⅥ）from wastewater.

关 键 词：零价纳米铁 C(rⅥ) 吸附 动力学 

分 类 号：X131.2[环境科学与工程—环境科学]