Electrochemical denitrification and kinetics study using Ti/IrO2-TiO2-RuO2 as the anode and Cu/Zn as the cathode

被引：64

作者：

Fan, Nianwen ^{[1
]}

Li, Zhengkui ^{[1
]}

Zhao, Lin ^{[1
]}

Wu, Ningmei ^{[1
]}

Zhou, Tao ^{[1
]}

机构：

[1] Nanjing Univ, Sch Environm, State Key Lab Pollutant Control & Resources Reuse, Nanjing 210023, Jiangsu, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2013年 / 214卷

关键词：

Electrochemical nitrate reduction; Indirect oxidation; Kinetics; Exponential Decay 2; Ti/IrO2-TiO2-RuO2; NITRATE REDUCTION; WASTE-WATER; ELECTROCATALYTIC ACTIVITY; AMMONIA; NITROGEN; OXYGEN; IR; ELECTROREDUCTION; ELECTRODES; REMOVAL;

D O I：

10.1016/j.cej.2012.10.026

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study investigated the performance of electrochemical denitrification using Ti/IrO2-TiO2-RuO2 as the anode and Cu/Zn as the cathode in an undivided cell. The main product of nitrate reduction of cathode was ammonia and indirect oxidation of the chlorine/hypochlorite took place in anodic area. However, the anode also possessed capacity of direct oxidation. The results of single-factor assay revealed that the optimal current density and NaCl dosage were 15 mA/cm(2) and 0.5 g/L, respectively. The model of Exponential Decay 2 can be used to simulate the reaction kinetics of nitrate to nitrogen (R-2 > 0.983) at any NaCl dosage and current density. Reaction kinetics of nitrate reduction in cathode can be represented by pseudo first-order kinetics after 100 rounds fitting iterations of Levenberg-Marquardt. Moreover, it was found that the corrosion of cathode was neglectable in acid/neutral condition and Zn was less active than Cu for nitrate removal. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：83 / 90

页数：8

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