非贵金属催化还原水中的硝酸盐氮  

STUDY ON NO_3^--N REMOVAL IN WATER BY NON-PRECIOUS METAL CATALYTIC REDUCTION

作　　者：叶舒帆[1,2] 胡筱敏[1] 和英滇[1] 张杨[3] 

机构地区：[1]东北大学资源与土木工程学院,沈阳110004 [2]温州市环境保护设计科学研究院,温州325027 [3]温州医学院信息与工程学院,温州325035

出　　处：《环境化学》2011年第10期1711-1717,共7页Environmental Chemistry

基　　金：国家科技重大专项课题(20092X07526-006)资助

摘　　要：基于双金属催化还原NO3--N的机理分析和常见金属催化电解脱硝技术的初步研究成果,对非贵金属元素催化还原水中NO3--N进行了实验研究.实验数据表明,Fe、Cu、Co、Pb和Zn 5种元素在阴极电场作用下对NO3--N具有较高的催化还原活性;NO3--N催化还原主要产物为NO2--N和NH4+-N,产物比例受催化元素选择性和电解条件的影响;电流密度、极板距离和搅拌强度对NO3--N的催化还原均有一定程度的影响,其影响规律和催化反应的控制步骤密切相关.Fe、Cu和Co 3种元素修饰阴极的催化电解无害化去除NO3--N实验结果表明,以500 mg·L-1NaCl(以Cl-计)为支持电解质,在温度24℃—26℃,电流密度6 mA.cm-2、极板距离6 mm、搅拌强度450 r.min-1条件下,50 mg·L-1NO3--N模拟废水电解150 min后,NO3--N和TN去除率均达90%以上.In this work,research of NO-3-N catalytic reduction by non-precious metals was carried out,based on the mechanism analysis of bimetallic catalytic reduction on NO-3-N and the research of common metallic catalytic electrolysis denitrification.The results indicate that Fe,Cu,Co,Pb and Zn presented high catalytic reductive activity for NO-3-N in cathode field.The major products of NO-3-N catalytic reduction were NO-2-N and NH＋4-N and the proportion of the reduction products was influenced by the catalyst selectivity and the electrolysis condition.Current density,plate distance and stirring intensity had certain effect on catalytic reduction respectively.And the influence was associated with the control steps of catalytic reaction.The experiment of NO-3-N removal using Fe,Cu or Co modified cathode in catalytic electrolysis reaction showed that the removal rates of NO-3-N and TN in 50 mg·L-1 NO-3-N stimulated wastewater reached 90% after 150 mins when electrolyzed at the supporting electrolyte of 500 mg·L-1 NaCl（measured by Cl-）,temperature of 24 ℃—26 ℃,current density of 6 mA·cm-2,plate distance of 6 mm,and stirring intensity of 450 r·min-1.

关 键 词：硝酸盐氮 非贵金属 催化还原 电解 

分 类 号：X13[环境科学与工程—环境科学]