电化学/催化加氢工艺去除硝酸盐的动力学及机理  

Reductive removal of nitrate by electrochemistry / catalytic hydrogenation coupling process: kinetics and mechanism

作　　者：张志强[1] 徐勇鹏[1] 时文歆[1] 张瑞君[1] 鲍现 崔福义[1] 

机构地区：[1]城市水资源与水环境国家重点实验室(哈尔滨工业大学),哈尔滨150090

出　　处：《哈尔滨工业大学学报》2016年第2期88-92,共5页Journal of Harbin Institute of Technology

基　　金：城市水资源与水环境国家重点实验室(哈尔滨工业大学)资助(2013DX12)

摘　　要：为解决地下水硝酸盐(NO3--N)污染问题,采用电化学/催化加氢耦合工艺对其进行去除,重点考察该工艺对NO3--N的降解动力学及反应机理.结果表明,电化学/催化加氢耦合工艺在厌氧条件下能够在短时间内将NO3--N完全去除,去除速率(以N计)可达72.6 mg·L-1·h-1,反应符合二级反应动力学规律,常数k=0.005 5 cm2·m A-1·min-1.水中NO3--N一部分由电化学反硝化降解去除,另一部分由催化加氢还原去除,两种反应通过电解水产H2反应耦联成为一个整体,宏观上符合电化学反硝化机理.The kinetics and mechanism in the electrochemistry/catalytic hydrogenation （E/C） coupling process, which was employed to remove nitrate （NO3--N ） from groundwater, was investigated in this paper. The results demonstrated that the NO3- -N could be rapidly removed by E/C under anoxic conditions, and the degradation efficiency of NO3--N followed the increasing current density（ID ） with observed second order reaction rate and the constant（k） value of 0.005 5 cm2· mA^-1 · min-l. The NO3--N reductive by E/C with two kinds of reactions, electrochemistry denitrification and catalytic reduction, both of which aggregated by the reaction of brine electrolysis.

关 键 词：硝酸盐 电化学反硝化 催化还原 动力学 

分 类 号：X52[环境科学与工程—环境工程]