抗坏血酸改性Br掺杂g-C<sub>3</sub>N<sub>4</sub>光催化降解污染物

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Abstract Using urea and ammonium bromide as precursor and bromine source, respectively, and ascorbic acid was used to modify g-C₃N₄. The ascorbic acid modified Br-doped g-C₃N₄-AA-Br nanosheets photocatalyst was successfully prepared through secondary roasting. The structure, morphology and optical properties of the catalysts were characterized by XRD, TEM, XPS, UV-Vis DRS, PL, N₂ adsorption-desorption and other test methods. The results show that g-C₃N₄-AA-Br had larger specific surface area, wider visible light absorption range and lower electron-hole recombination rate. The photocatalytic performance of different catalysts on the degradation of rhodamine B, methyl orange, and reactive blue dyes was investigated under visible light. The results showed that g-C₃N₄-AA-Br-2 increased the degradation of RhB by 72% within 180minutes, and its rate constant k=0.00847min^-1, which is 5.6 times that of pure g-C₃N₄. Through the active species trapping agent experiment, it is found that the main active species that degrade RhB are hydroxyl radicals(·OH) and superoxide radicals(·O₂^-), and the possible reaction mechanism is speculated.

Key words： carbon nitride nanosheets Br doping photocatalytic degradation

Received: 25 April 2021

PACS:

X703.5

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	Articles by authors
	ZHANG Yang-quan
	LI Xue-lei
	ZHAO Zhi-jun
	WANG Yan-juan
	YUAN Xing-zhou
	ZHANG Jian
	HU Shao-zheng

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ZHANG Yang-quan,LI Xue-lei,ZHAO Zhi-jun等. Ascorbic acid modified Br-doped g-C₃N₄ photocatalytic degradation of pollutants[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5160-5168.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5160

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