不同条件下Cu-Pd-TiO2多金属纳米电极去除地下水中硝酸盐氮的影响

现代地质 ›› 2017, Vol. 31 ›› Issue (03): 623-628.

不同条件下Cu-Pd-TiO₂多金属纳米电极去除地下水中硝酸盐氮的影响

刘芳¹^,²(), 李淼², 周方², 胡伟武³, 王乐乐³, 刘翔²()

1.北京工业大学建筑工程学院, 北京 100124
2.清华大学环境学院, 北京 100084
3.中国地质大学(北京) 水资源与环境学院, 北京 100083

收稿日期:2016-11-13 修回日期:2017-01-31 出版日期:2017-06-10 发布日期:2017-06-27
通讯作者: 刘翔,男,教授,博士,1965年出生,环境工程专业,主要从事土壤与地下水方面的研究。Email:x.liu@tsinghua.edu.cn。
作者简介:刘芳,女,博士研究生,1982年出生,市政工程专业,主要从事水体污染治理方面的研究。Email:124079906@qq.com。
基金资助:
国家自然科学基金项目(51408335)

Effect of Cu-Pd-TiO₂ Polymetallic Nanoelectrode to Remove NO₃^--N in Groundwater Under Different Conditions

LIU Fang¹^,²(), LI Miao², ZHOU Fang², HU Weiwu³, WANG Lele³, LIU Xiang²()

1. College of Architecture & Civil Engineering, Beijing University of Technology, Beijing 100124,China
2. School of Environment, Tsinghua University, Beijing 100084,China
3. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China

Received:2016-11-13 Revised:2017-01-31 Online:2017-06-10 Published:2017-06-27

摘要/Abstract

摘要：

以Pt为阳极,以Ti纳米管为基底修饰一薄层Pd和Cu构成的多金属纳米电极为阴极,搭建电化学反应器进行去除硝酸盐氮(NO₃^--N)研究,观察了在不同电流密度、初始浓度和pH值条件下该多金属纳米电极对NO₃^--N去除率的影响。结果表明,在电流密度为30 mA/cm²,添加0.50 g/L的 Na₂SO₄作为支持电解质的条件下,电解90 min后Cu-Pd-TiO₂多金属纳米电极对硝酸盐的去除率可达81%,而相同条件下金属Ti做阴极时对硝酸盐的去除率仅为24.5%。溶液pH值的改变对 NO₃^--N的去除效果几乎没有影响;随着电流密度的增高,NO₃^--N的去除效率也随之提高;而随着溶液初始浓度的升高,NO₃^--N的去除率反而略有下降。

关键词: 多金属纳米电极, 硝酸盐, 纳米管, 阴极, 阳极

Abstract:

Taking Pt as anode, and taking the polymetallic nanoelectrode (Cu-Pd-TiO₂) formed by a thin Cu and Pd layer coating on the Ti nanotubes as cathode, the authors constructed an electrochemical reactor for NO₃^--N removal, and observed the removal rates of the polymetallic nanoelectrode to NO₃^--N under different conditions such as current density, initial concentrations, pH influence, and so on.The results showed that using the Cu-Pd-TiO₂ polymetallic nanoelectrode,the nitrate removal rate can reach 81% in the presence of 0.50 g/L Na₂SO₄ with the current density of 30 mA/cm² after 90 min electrolysis,and that under the same conditions, the removal rate of the Ti electrode as cathode was 24.5%. The pH had little effect on the NO₃^--N removal rate. For the same initial nitrate concentration, the NO₃^--N removal rate increased with increasing current density. The NO₃^--N reduction efficiency declined slightly as the initial nitrate concentration increased.

Key words: polymetal nanoelectrode, nitrate, nanotube, anode, cathode

中图分类号:

P641.3

刘芳, 李淼, 周方, 胡伟武, 王乐乐, 刘翔. 不同条件下Cu-Pd-TiO₂多金属纳米电极去除地下水中硝酸盐氮的影响[J]. 现代地质, 2017, 31(03): 623-628.

LIU Fang, LI Miao, ZHOU Fang, HU Weiwu, WANG Lele, LIU Xiang. Effect of Cu-Pd-TiO₂ Polymetallic Nanoelectrode to Remove NO₃^--N in Groundwater Under Different Conditions[J]. Geoscience, 2017, 31(03): 623-628.

图/表 6

图1 电化学反应装置原理图

Fig.1 Schematic diagram of the electrochemical apparatus

图2 不同电极对硝酸盐氮的去除效果对比

Fig.2 Contrast of the removal effect of different electrodes on nitrate nitrogen

图3 不同电极的SEM图像 A.纯Ti板;B.Ti纳米电极;C. Cu-Pd-TiO2多金属纳米电极

Fig.3 Field-emission scanning electron microscopy images of the Ti electrode surface, Ti nanoelectrode surface, and Cu-Pd-TiO2 nanoelectrode surface

图4 初始浓度对NO3--N去除效率的影响

Fig.4 Effects of the initial nitrate concentration on changes of the nitrate concentration with time

图5 电流密度对NO3--N去除效率的影响

Fig.5 Effects of the current density on changes of the nitrate concentration with time

图6 pH值对NO3--N去除效率的影响

Fig.6 Effects of the pH on changes of the nitrate concentration with time

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不同条件下Cu-Pd-TiO₂多金属纳米电极去除地下水中硝酸盐氮的影响

Effect of Cu-Pd-TiO₂ Polymetallic Nanoelectrode to Remove NO₃^--N in Groundwater Under Different Conditions

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