生物炭孔径结构-氮缺陷与四环素降解的相关性

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Abstract Different pore structure and nitrogen defects of biochar materials were prepared in this work. The dynamic data of adsorption and persulfate-based advanced oxidation process (catalysis) systems were combined with the nitrogen adsorption -desorption test, X-ray photoelectron spectroscopy, Raman test and other characterization methods. They were used to analysis the correlation of pore structure-nitrogen defects and typical antibiotics (tetracycline hydrochloride) degradation systematically and deeply. The results showed that mesoporous surface area and specific surface area were most correlated with persulfate reaction. Nitrogen, especially graphite nitrogen (R²=0.9766) and pyridine nitrogen (R²=0.9596), was the most relevant elements to the reaction process of the system. In addition, the correlation between pore structure and the results was basically same in adsorption and catalysis processes. But nitrogen showed greater correlation in catalysis system than adsorption. Through quenching experiment, linear sweep voltammetry and Raman test, it was found that the catalysis was mainly dominated by singlet oxygen, which meant it was nonradical pathway. Finally, a better preparation direction for biochar materials to be used as activators in the persulfate-based advanced oxidation process of tetracycline hydrochloride was provided. Biochar materials with larger mesoporous surface area, larger specific surface area and more nitrogen, especially graphite nitrogen and pyridine nitrogen should be prepared for the catalysis of tetracycline hydrochloride.

Key words： persulfate nitrogen defects pore structure correlation

Received: 02 December 2021

PACS:

X703.1

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	WANG Qing
	NI Jing-xuan
	GAO Yuan

Cite this article:

WANG Qing,NI Jing-xuan,GAO Yuan. Correlation between biochar pore structure-nitrogen defects and tetracycline hydrochloride degradation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3370-3377.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3370

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