TiO2-NB/pg-C3N4可见光催化降解17α-乙炔雌二醇的机理

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Abstract TiO₂-NB/pg-C₃N₄ photocatalysts were prepared using prepared porous C₃N₄ nanosheets and TiO₂ nanobelts via grinding and followed calcination, and the preparation conditions were optimized. The prepared materials were used to remove 17α-ethynylestradiol(EE2) under visible light irradiation, which has most potent estrogenic activity. The structure and surface physical-chemical properties of them were comprehensively investigated by scanning electron microscope (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS) and N₂ adsorption-desorption isotherms (BET). The results showed that the B-type TiO₂ nanobelts were anchored onto porous C₃N₄ nanosheets to form TiO₂-NB/pg-C₃N₄ composite photocatalyst. The degradation rate constants of EE2 on TiO₂-NB/pg-C₃N₄ (0.02537min^-1) was 12.88 times and 3.29 times than those on pure TiO₂-NB(0.00197min^-1) and pg-C₃N₄(0.0077min^-1). Active species capture experiments showed that ·O₂^- was the main active specie in the EE2 degradation process on TiO₂-NB/pg-C₃N₄. The HPLC-high resolution mass spectrum (HPLC-HRMS) measurement results showed that there were 4 intermediates and possible degradation route was proposed. Moreover, the estrogenic activity measurement by MCF-7method during degradation process showed that TiO₂-NB/pg-C₃N₄ can effectively eliminate the estrogenic activity without producing by-products with more estrogenic activity.

Key words： TiO₂ nanobelts pg-C₃N₄ composite photocatalyst photocatalysis 17α-ethinylestradiol

Received: 18 May 2021

PACS:

X703.5

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	Articles by authors
	LUO Li-jun
	MENG De-mei
	DAI Jian-hui
	LI Jun-Hong
	ZHENG Li-bo
	XIA Li-hong
	JIANG Feng-zhi

Cite this article:

LUO Li-jun,MENG De-mei,DAI Jian-hui等. The degradation mechanism study of 17α-ethinylestradiol by TiO₂ nanobelt/pg-C₃N₄ photocatalyst under visible light irradiation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 654-664.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/654

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