阴离子对零价铁修复铬污染水体的影响  

Effects of anions on remediation of chromium-polluted water by zero-valent iron

作　　者：李雅[1] 汪葵[2] 吴奇[1] 见星刚 李超超[1] 张丹[1] 

机构地区：[1]西安航空学院动力工程系,陕西西安710077 [2]江西环境工程职业学院林业与环境学院

出　　处：《环境与健康杂志》2014年第5期452-453,共2页Journal of Environment and Health

基　　金：江西省科技支撑计划项目(20132BBG70026);西安航空学院校级课题(12XQ306);陕西省大学生创新创业训练计划项目(201211396003)

摘　　要：目的研究阴离子存在对零价铁去除水体中Cr（Ⅵ）污染的影响。方法向200ml含2．0mmol／L阴离子[NO3-和（或）H2PO4-]的Cr（VI）（10mg／L）溶液中加入3．5g铁粉，以235r／min分别振荡5、10、15、20、25、30、40、50、60min后，测定水中Cr（Ⅵ）浓度并计算其去除率。结果反应0—10min，所有待测体系Cr（Ⅵ）去除率迅速上升，10min后上升速率减慢。铁粉＋NO3-、铁粉＋H2PO4-、铁粉＋NCl3-＋H2PO4-体系Cr（Ⅵ）去除率达到100％的时间分别为40、15、15min。结论NO3-与H2PO4-单独存在及共存都可以促进零价铁去除水体中Cr（Ⅵ）污染。其中，H2PO4-单独存在体系的促进作用最强。Objective To study the effects of anions on remediation of chromium （Cr）-polluted water by zero-valent iron. Methods A total of 3.5 g iron powder were added into 200 ml Cr（VI） （10 mg/L） solution with 2.0 mmol/L anions [NO3- and （or） H2PO4-]. After the solution was shaken respectively for 5, 10, 15, 20, 25, 30, 40, 50 and 60 min, Cr （VI） concentration was determined and the removal ratio was calculated. Results Cr （VI） removal rate increased rapidly during the first 10 rain, and then became slowly. The periods for Cr （VI） removal rate reaching 100% were 40,15,15 min in iron＋NO3-, iron＋H2PO4-, iron＋ NO3-＋H2PO4- systems respectively. Conclusion NO3- and H2PO4- existence alone or co-existence in the system can promote zero-valent iron to remove water Cr（VI） contamination. H2PO4- alone system may play the most important role.

关 键 词：铬 零价铁 水净化 

分 类 号：R123.3[医药卫生—环境卫生学]