滤压式电解槽中氨氮间接电氧化反应动力学

高等学校化学学报

滤压式电解槽中氨氮间接电氧化反应动力学

徐红^1,2, 苏静¹, 项新亮¹, 黄卫民^1,2, 林海波^1,2

1. 吉林大学化学学院,
2. 吉林省表面与界面化学重点实验室, 长春 130012

收稿日期:2007-11-20 修回日期:1900-01-01 出版日期:2008-07-10 发布日期:2008-07-10
通讯作者: 林海波

A Kinetics of Indirect Electro-oxidation Reation of NH₃-N with Chloride Ion in a Filter-press Type Electrochemical Cell

XU Hong^1,2, SU Jing^1,2, XIAN Xin-Liang¹, HUANG Wei-Min^1,2, LIN Hai-Bo^1,2*

1. College of Chemistry,
2. Key Laboratory of Surface and Interface Chemistry of Jilin Province, Jilin University, Changchun 130012, China

Received:2007-11-20 Revised:1900-01-01 Online:2008-07-10 Published:2008-07-10
Contact: LIN Hai-Bo

摘要/Abstract

摘要： 研究了模拟氨氮废水在滤压式电解槽中的电化学氧化过程. 结果表明, 在一定浓度Cl^-的存在下, 氨氮化合物的间接电氧化过程符合二级反应动力学规律. 利用Hatta准数进一步分析电解槽内反应的空间分布得知, 不同条件下的Hatta准数均小于0.3, 这说明氨氮化合物的间接电氧化过程主要发生在慢反应动力学区域, 即发生在本体溶液中.

关键词: 氨氮间接电氧化, 活性氯, 二级反应动力学, 滤压式电解槽, Hatta准数

Abstract: Indirect electro-oxidation of the simulated wastewater containing ammonia-N in a filter press-type electrochemical cell was studied. The process obeys a second order reaction kinetics with a certain concentration of chlorine ion, when the concentration of NH₃-N is equivalent of/to the one of electro-generated active chlorine. The cell performance is influenced significantly by the operating conditions including current density, flow rate and initial concentration of NH₃-N. The results show that the best optimum operating condition is electrolyte flow rate of 60 L/h and current density of 60 mA/cm² in slightly alkaline(pH=8.0) solution with 0.1 mol/L NaCl and 1 mol/L Na₂SO₄ as a supporting electrolyte at 25 ℃, and kinetic rate constant k₂=3.23×10^-5 m³/(mol·s). The information about the spatial distribution of the reactions may be obtained from the Hatta number. The value of the Hatta number(<0.3), estimated under different operation conditions, implies that most of the reaction of the ammonia with active chlorine occurred in the bulk solution, which provided the effective information to design the electrochemical cell.

Key words: Indirect electro-oxidation of NH₃-N, Active chlorine, Second order reaction kinetics, Filter-press type electrochemical cell, Hatta number

中图分类号:

O646

TrendMD:

徐红,苏静,项新亮,黄卫民,林海波 . 滤压式电解槽中氨氮间接电氧化反应动力学. 高等学校化学学报, doi: .

XU Hong^1,2, SU Jing^1,2, XIAN Xin-Liang¹, HUANG Wei-Min^1,2, LIN Hai-Bo^1,2*. A Kinetics of Indirect Electro-oxidation Reation of NH₃-N with Chloride Ion in a Filter-press Type Electrochemical Cell. Chem. J. Chinese Universities, doi: .