中国环境科学

作者：刘国华, 李乾岗, 张彤彤, 杜洪彪, 仙光, 曾凡刚, 齐鲁

单位：1. 中国人民大学, 化学与生命资源学院低碳水环境技术研究中心, 北京 100872;2. 中国人民大学生态环境学院, 北京 100872;3. 陆军勤务学院勤务指挥系, 重庆 401331

关键词：氨氮,活性氯,氯自由基,二氧化钛,电化学高级氧化

基金：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)

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.

来源：2024年第11期

《中国环境科学》期刊编辑部

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