TiO<sub>2</sub>纳米线负载RuO<sub>2</sub>阳极制备及其氨氧化性能

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摘要 In order to further improve the ammonia removal efficiency of the chlorine-mediated electrochemical advanced oxidation (Cl-EAO) technology, a new TiO₂ nanobelts loaded RuO₂ anode (TiO₂ NBs-RuO₂) was prepared in this study. Based on the investigation of its material and electrochemical properties, the ammonia oxidation performance of the anode was explored under different conditions, and the ammonia oxidation mechanism was explored by combining electron paramagnetic resonance (EPR) and free radical inhibition assays. The material characterization results indicated that RuO₂ was loaded on the surface of TiO₂ nanobelts uniformly, which formed a porous and stable structure, and the nanobelts diameter was within 100nm. The electrochemical characterization results indicated that TiO₂ NBs-RuO₂ anode has inhibited the oxygen evolution reaction and improved the current efficiency of the chlorine evolution reaction. The ammonia oxidation process of TiO₂ NBs-RuO₂ anode followed zero order reaction kinetics, and the ammonia nitrogen removal efficiency reached over 99.6% within 50min, which was significantly higher than unmodified Ti-RuO₂ anode and TiO₂-RuO₂ anode. Moreover, its ammonia oxidation rate increased with the increase of initial ammonia nitrogen concentration, initial chlorine concentration, initial pH, and current density. It was found that the ClO· played the most important role in the ammonia oxidation process. In addition, this study compared the TiO₂ NBs-RuO₂ anode and the most common commercial Ti-RuO₂ anode and found that the ammonia oxidation rate of TiO₂ NBs-RuO₂ anode was 29.7% higher than the commercial anode, and the energy consumption ratio and nitrate nitrogen yield of TiO₂ NBs-RuO₂ anode were also lower than the commercial one.

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	刘国华
	李乾岗
	张彤彤
	杜洪彪
	仙光
	曾凡刚
	齐鲁

关键词 ：氨氮, 活性氯, 氯自由基, 二氧化钛, 电化学高级氧化

Abstract：In order to further improve the ammonia removal efficiency of the chlorine-mediated electrochemical advanced oxidation (Cl-EAO) technology, a new TiO₂ nanobelts loaded RuO₂ anode (TiO₂ NBs-RuO₂) was prepared in this study. Based on the investigation of its material and electrochemical properties, the ammonia oxidation performance of the anode was explored under different conditions, and the ammonia oxidation mechanism was explored by combining electron paramagnetic resonance (EPR) and free radical inhibition assays. The material characterization results indicated that RuO₂ was loaded on the surface of TiO₂ nanobelts uniformly, which formed a porous and stable structure, and the nanobelts diameter was within 100nm. The electrochemical characterization results indicated that TiO₂ NBs-RuO₂ anode has inhibited the oxygen evolution reaction and improved the current efficiency of the chlorine evolution reaction. The ammonia oxidation process of TiO₂ NBs-RuO₂ anode followed zero order reaction kinetics, and the ammonia nitrogen removal efficiency reached over 99.6% within 50min, which was significantly higher than unmodified Ti-RuO₂ anode and TiO₂-RuO₂ anode. Moreover, its ammonia oxidation rate increased with the increase of initial ammonia nitrogen concentration, initial chlorine concentration, initial pH, and current density. It was found that the ClO· played the most important role in the ammonia oxidation process. In addition, this study compared the TiO₂ NBs-RuO₂ anode and the most common commercial Ti-RuO₂ anode and found that the ammonia oxidation rate of TiO₂ NBs-RuO₂ anode was 29.7% higher than the commercial anode, and the energy consumption ratio and nitrate nitrogen yield of TiO₂ NBs-RuO₂ anode were also lower than the commercial one.

Key words： ammonia active chlorine chlorine free radicals titanium dioxide electrochemical advanced oxidation

收稿日期: 2024-04-16

PACS:

X703.1

基金资助:中国人民大学2022年度拔尖创新人才培育资助计划成果;重庆市教委科学技术研究项目(KJQN202212902)

通讯作者: 曾凡刚,教授,zengfg@ruc.edu.cn E-mail: zengfg@ruc.edu.cn

作者简介: 刘国华(1976-),男,内蒙古呼和浩特人,教授,博士,研究方向为低碳污水处理技术.发表论文50余篇.lgh@ruc.edu.cn.

引用本文:

刘国华, 李乾岗, 张彤彤, 杜洪彪, 仙光, 曾凡刚, 齐鲁. TiO₂纳米线负载RuO₂阳极制备及其氨氧化性能[J]. 中国环境科学, 2024, 44(11): 6181-6193. LIU Guo-hua, LI Qian-gang, ZHANG Tong-tong, DU Hong-biao, XIAN Guang, ZENG Fan-gang, QI Lu. Preparation of TiO₂ nanobelts loaded RuO₂ anode and the research of its ammonia oxidation performance. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6181-6193.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I11/6181

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