香榧壳生物炭/g-C<sub>3</sub>N<sub>4</sub>活化过硫酸盐的光催化性能

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Abstract g-C₃N₄/biochar composite photocatalysts with high catalytic activity were prepared by a simple one-pot thermal polymerization method using cephalotaxus shell and melamine as raw materials, which was applied to activate peroxynitrite(PS) for the degradation of acetaminophen(AAP) wastewater under visible light. The optical properties of the composite catalyst were investigated by UV-vis diffuse reflectance absorption spectroscopy(UV-vis DRS) and photoluminescence spectroscopy(PL), which showed that the visible light absorption boundary of g-C₃N₄ was enhanced from 483 nm to 553 nm and improved the separation efficiency of photogenerated electron-hole pairs due to the introduction of biochar. The results of scanning electron microscopy(SEM), X-ray diffraction spectroscopy(XRD), Fourier transform infrared spectroscopy(FT-IR) and X-ray photoelectron spectroscopy(XPS) showed that the microstructure of g-C₃N₄ was improved by the introduction of biochar. The removal efficiency of AAP was enhanced by the introduction of persulfate into the reaction system. The results show that the degradation rate for AAP under visible light irradiation was 8.9 times higher than that without PS addition, indicating that the catalytic system can effectively activate PS to produce more highly reactive oxidants. The radical capture experiments showed the presence of ·O₂^-, h⁺, ·OH and ·SO₄^-reactive substances in the catalytic system. The improvement of composite material performance was attributed to the effective inhibition of electron-hole recombination by biochar as an electron acceptor.

Key words： visible-light photocatalysis persulfate activation biochar acetaminophen

Received: 27 July 2021

PACS:

X703.5

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	Articles by authors
	ZHANG Ting-ting
	XU He
	CAI Dong-qing
	CHEN Shi-yan
	WANG Hua-ping

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ZHANG Ting-ting,XU He,CAI Dong-qing等. Study on photocatalytic performance of cephalotaxus shell biochar/g-C₃N₄ activated persulfate[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1146-1156.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1146

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