氧化还原介体强化高铁酸盐降解新污染物

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Abstract The most representative redox mediator, tetramethylpyrazine oxide (TEMPO), was used to investigate the efficacy and mechanism of its enhanced degradation of emerging contaminants by ferrate (Fe(VI)). The results showed that the system could remove 73% of sulfamethoxazole (5μmol/L) within 120 seconds. Through in-depth analysis, it was found that TEMPO+ and Fe(V)/Fe(IV) are key active species in the system. Additionally, the effects of TEMPO concentration, initial pH and common components (humic acid, inorganic anions) in the actual water on the reaction system were investigated. Given the difficulties in recycling and potential secondary pollution of homogeneous catalysts, the 4-amino-TEMPO@SiO₂ heterogeneous catalysts were further developed. The prepared heterogeneous catalyst demonstrated significant enhancement effects on phenolic, quinolone, and tetracycline pollutants, with the most notable effects on phenol and tetracycline, which can be completely removed in just 20 seconds.

Key words： tetramethylpiperidine oxides ferrate emerging contaminants kinetics oxidizing species

Received: 05 January 2024

PACS:

X703

Corresponding Authors: 张静,教授,zhang_jing@hit.edu.cn E-mail: zhang_jing@hit.edu.cn

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	SONG Li-xian
	ZHENG Cheng-zhi
	YU Yong-qiang
	ZHANG Jing
	MA Jun

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SONG Li-xian,ZHENG Cheng-zhi,YU Yong-qiang等. Redox mediator-enhancing ferrate(VI) oxidation of emerging contaminants[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4588-4598.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I8/4588

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