粘土负载纳米零价铁去除水中的Cr(Ⅵ)  

Clay-supported nanoscale zero-valent iron for Cr(Ⅵ) removal from aqueous solution

作　　者：邓小婵[1] 孙姗[1] 李黎[1] 唐次来[2,3] 黄应平[2,3] 方艳芬[1,2,3] 

机构地区：[1]三峡大学生物与制药学院,湖北宜昌443002 [2]三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002 [3]三峡大学三峡库区生态环境教育部工程研究中心,湖北宜昌443002

出　　处：《应用化工》2016年第9期1624-1628,共5页Applied Chemical Industry

基　　金：国家水专项子项目(2012ZX07104-003-04);湖北省创新群体项目(2015CFA021);科技惠民计划(S2013GMD100042)

摘　　要：采用NaBH_4还原FeCl_3制备纳米铁(nZVI),利用标准粘土为载体制备了负载纳米铁(C-nZVI),用于去除水体中的重金属Cr(Ⅵ),考察起始pH、Cr(Ⅵ)初始浓度、C-nZVI的量对Cr(Ⅵ)去除率的影响。结果表明,Cr(Ⅵ)的去除随着起始pH和Cr(Ⅵ)初始浓度的降低及纳米铁剂量的增加而增加,当起始pH为4.14,Cr(Ⅵ)初始浓度为10mg/L,纳米铁投加量为30g/L时,Cr(Ⅵ)的去除率达到95%。并对C-nZVI去除Cr(Ⅵ)的机理进行了推测,表明其涉及还原和共沉淀历程。Nanoscale zero-valent iron（ nZVI） was prepared by reducing ferric ion（ FeCl3·6H2O） to Fe～0 using the borohydride（ NaBH4） reduction method,nZVI was loasded onto clay as a supported material（ C-n ZVI）. By studying the removal of environmental pollutant Cr（ Ⅵ） from water by C-nZVI under these conditions（ initial pH,initial concentration of reagent,the dose of n ZVI）. The result showed that Cr（ Ⅵ）removal increased with the decreasing of initial pH,initial concentration of Cr（ Ⅵ） and the increasing of C-nZVI amount at room temperature,about 95% of Cr（ Ⅵ） was removed from aqueous solution using CnZVI at an initial condition of 10 mg / L Cr（ Ⅵ） within 60 min under the conditions of 30 g / L of C-n ZVI,pH 4. 14. The mechanism of Cr（ Ⅵ） removal using C-n ZVI was speculated which mainly involved to the reduction reaction and co-precipitation.

关 键 词：纳米铁 粘土 Cr(Ⅵ) 机理 

分 类 号：TQ085.412[化学工程] TQ203.5