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Ti/RuO2-IrO2-SnO2-Sb2O5阳极在农村饮用水消毒中的应用

  • 郭静如 ,
  • 张雪娇 ,
  • 廖帅 ,
  • 陈雪明
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  • 浙江大学环境与资源学院,浙江 杭州 310058
* Tel: (86)13858099424, E-mail: chenxm@zju.edu.cn

收稿日期: 2020-09-10

  修回日期: 2020-10-30

  网络出版日期: 2020-11-05

基金资助

国家重点研发计划项目(2019YFC0408800)

Application of Ti/RuO2-IrO2-SnO2-Sb2O5 Anode in Rural Drinking Water Disinfection

  • Jing-Ru Guo ,
  • Xue-Jiao Zhang ,
  • Shuai Liao ,
  • Xue-Ming Chen
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  • College of Environmental & Resource Sciences of Zhejiang University, Hangzhou 310058, Zhejiang, China

Received date: 2020-09-10

  Revised date: 2020-10-30

  Online published: 2020-11-05

摘要

采用热分解法制备了一种新型高效析氯阳极Ti/RuO2-IrO2-SnO2-Sb2O5,将其应用于农村饮用水消毒频繁停开、低电解液浓度的特殊工况下,并与Ti/RuO2-SnO2-Sb2O5、Ti/RuO2-TiO2、Ti/RuO2-TiO2-IrO2三种析氯阳极进行性能对比。通过SEM、EDS、XRD等方法表征测试阳极表面形貌、元素及组成,考察了氯化钠浓度、电流密度、停开频率对阳极析氯效果和寿命的影响。研究发现,Ti/RuO2-IrO2-SnO2-Sb2O5阳极活性强、稳定性高;阳极涂层各组分高度融合为固溶体,结构致密,稳定性强;在15 g·L-1 NaCl、400 A·m-2电流密度、20℃条件下,Ti/RuO2-IrO2-SnO2-Sb2O5阳极电解的电流效率达到91.55%;频繁停开、强化电解条件下寿命达到231 h,是Ti/RuO2-TiO2阳极的77倍,预估在400 A·m-2电流密度下能够使用20年。

本文引用格式

郭静如 , 张雪娇 , 廖帅 , 陈雪明 . Ti/RuO2-IrO2-SnO2-Sb2O5阳极在农村饮用水消毒中的应用[J]. 电化学, 2021 , 27(5) : 549 -557 . DOI: 10.13208/j.electrochem.200909

Abstract

Sodium hypochlorite disinfection has many advantages, including reliable operation, low cost, easily available raw materials. It is, therefore, suitable for disinfection of drinking water in remote rural areas. The service life and chlorine evolution efficiency of the anode are the main factors restricting the performance of the sodium hypochlorite generator. The special conditions of frequent shutdown and low electrolyte concentration in the rural drinking water application also put forward high requirements on the performance of the anode. In this study, Ti/RuO2-IrO2-SnO2-Sb2O5,a new-type and efficient chlorine evolution anode, was prepared by thermal decomposition method and further applied to disinfection of drinking water in rural areas. Comparison was also made between this anode with Ti/RuO2-SnO2-Sb2O5, Ti/RuO2-TiO2 and Ti/RuO2-TiO2-IrO2 anodes. The surface morphology, elements and composition of the anodes were examined by SEM, EDS and XRD. The effects of sodium chloride concentration, current density and shutdown frequency on chlorine evolution efficiency and lifetime of the anodes were also investigated. It was found that the Ti/RuO2-IrO2-SnO2-Sb2O5 electrode exhibited strong activity and high stability, and its coating components were highly fused into a solid solution with dense structure and great stability. The current efficiency of Ti/RuO2-IrO2-SnO2-Sb2O5 anode reached 91.55% in 15 g·L-1 NaCl solution at 400 A·m-2 and 20℃. In the enhanced electrolysis lifetime experiment, the service lifetime of Ti/RuO2-IrO2-SnO2-Sb2O5 anode reached 231 h, which was 77 times longer than that of Ti/RuO2-TiO2 anode. It was estimated that the Ti/RuO2-IrO2-SnO2-Sb2O5 anode could be used for 20 years under the current density of 400 A·m-2. Therefore, compared with the traditional electrode materials, Ti/RuO2-IrO2-SnO2-Sb2O5 achieved higher chlorine evolution efficiency and stability. It could be used for a long time in the condition of frequent shutdown and low electrolyte concentration. Besides, it could greatly reduce the equipment operation cost, the raw material feeding frequency and the impurities introduction. Thus, the Ti/RuO2-IrO2-SnO2-Sb2O5 anode developed in this studymight be suitable for rural drinking water disinfection application.

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