一种C<sub>3</sub>N<sub>4</sub>光催化剂的制备及其对四环素类抗生素的降解

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Abstract In this study, C₃N₄ was fabricated by thermal polymerization using a single urea as a precursor, for which the structure, composition, optical properties and photocatalytic activity of the prepared C₃N₄ materials were characterized by SEM, XRD, XPS, FT-IR and UV-Vis analyses. The as-fabricated C₃N₄ was found to display a flower-like porous nanosheet structure and a large specific surface area. The C₃N₄ exhibited good photocatalytic activity for the degradation of tetracycline hydrochloride (TCH) under the irradiation of xenon lamp at 320~780nm, and the degradation rate reached 99.60% within 60min. The results of free radical quenching experiments showed that •O₂^ˉ、¹O₂ and h⁺ were the main causes of TCH degradation. Further analysis by comparative tests and DFT theoretical calculations revealed that the superior photocatalytic effect of C₃N₄ prepared from urea than M-C₃N₄ prepared from melamine was attributed to the flower-like porous structure of C₃N₄ with larger specific surface area for more active sites and oxygen vacancies. Furthermore, the prepared catalyst C₃N₄ showed similar catalytic effect on tetracycline-based antibiotics (chrysomycin hydrochloride (CTC) and oxytetracycline (OTC)). Further, the possible degradation pathways of TCH were proposed by analyzing the photocatalytic oxidation intermediates.

Key words： photocatalysis C₃N₄ tetracycline hydrochloride (TCH) theoretical calculation

Received: 03 August 2023

PACS:

X703.5

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	GAO Yi-fang
	GUO Rui
	JIAO Yuan
	LIU Xiao-na
	QIAN Tian-wei

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GAO Yi-fang,GUO Rui,JIAO Yuan等. Preparation of a C₃N₄ photocatalyst and its degradation of tetracycline antibiotics[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(4): 2073-2082.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I4/2073

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