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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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

Received: 16 April 2024

PACS:

X703.1

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	LIU Guo-hua
	LI Qian-gang
	ZHANG Tong-tong
	DU Hong-biao
	XIAN Guang
	ZENG Fan-gang
	QI Lu

Cite this article:

LIU Guo-hua,LI Qian-gang,ZHANG Tong-tong等. Preparation of TiO₂ nanobelts loaded RuO₂ anode and the research of its ammonia oxidation performance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6181-6193.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/6181

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