Optimization of the cathode material for nitrate removal by a paired electrolysis process

被引：122

作者：

Reyter, David ^{[1
,2
]}

Belanger, Daniel ^{[2
]}

Roue, Lionel ^{[1
]}

机构：

[1] INRS Energie Mat & Telecommun, Varennes, PQ J3X 1S2, Canada

[2] Univ Quebec Montreal, Dept Chim, Montreal, PQ H3C 3P8, Canada

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2011年 / 192卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Nitrate removal; Electrochemical treatment; Paired electrolysis; Ammonia oxidation; Cu-Ni cathodes; COPPER-NICKEL-ALLOYS; CONCENTRATED SODIUM-HYDROXIDE; ELECTROCHEMICAL REDUCTION; ELECTROCATALYTIC REDUCTION; WASTE-WATER; ELECTRODES; AMMONIA; NITROGEN; ELECTROREDUCTION; CORROSION;

D O I：

10.1016/j.jhazmat.2011.05.054

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Ni, Cu, Cu90Ni10 and Cu70Ni30 were evaluated as cathode materials for the conversion of nitrate to nitrogen by a paired electrolysis process using an undivided flow-through electrolyzer. Firstly, corrosion measurements revealed that Ni and Cu70Ni30 electrodes have a much better corrosion resistance than Cu and Cu90Ni10 in the presence of chloride, nitrate and ammonia. Secondly, nitrate electroreduction experiments showed that the cupro-nickel electrodes are the most efficient for reducing nitrate to ammonia with a selectivity of 100%. Finally, paired electrolysis experiments confirmed the efficiency of Cu70Ni30 and Cu90Ni10 cathodes for the conversion of nitrate to nitrogen. During a typical electrolysis, the concentration of nitrate varied from 620 ppm to less than 50 ppm NO3- with an N-2 selectivity of 100% and a mean energy consumption of 20 kWh/kg NO3- (compared to similar to 35 and similar to 220 kWh/kg NO3- with Cu and Ni cathodes. respectively). (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：507 / 513

页数：7

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