改性尖晶石催化盐酸四环素降解性能及机理研究

doi:10.3969/j.issn.2097-2806.2025.04.009

Abstract

Abstract:

Spinel photocatalysts have environmental friendliness and excellent stability, which have broad application potential in the photocatalytic degradation of antibiotic wastewater. In this work, Cr-doped ZnAl₂O₄ spinel photocatalyst was prepared by hydrothermal method. The crystal structure, microstructure and spectral properties of the catalyst were characterized by XRD, SEM, EDS, FTIR and PL. Tetracycline hydrochloride was used as the degradation object. The catalytic performance of Cr-doped ZnAl₂O₄ spinel photocatalyst was investigated under xenon lamp irradiation. The results showed that the ZnAl₂O₄ spinel prepared by hydrothermal method was of normal spinel structure. The morphology of ZnAl₂O₄ was irregular blocks of 180-400 nm with porous structure. The lattice structure of ZnAl₂O₄ was not changed after Cr doping, and Cr was uniformly distributed in ZnAl₂O_4.The band gap width of Zn_0.4Cr_0.6Al₂O₄was only 2.87 eV, and the photoluminescence intensity of Zn_0.4Cr_0.6Al₂O₄ was significantly reduced. The highest percentage of degradation of tetracycline hydrochloride catalyzed by Zn_0.4Cr_0.6Al₂O₄ samples at 180 min irradiation was 96.02%, and the degradation percentage was increased to 97.95% at pH 3.The degradation percentage could still maintain above 90% after 5 cycles of testing, indicative of excellent reusability.

Key words: ZnAl₂O₄ spinel, Cr doping, tetracycline hydrochloride, photocatalysis, reuse

CLC Number:

O643.3

Feng Cen, Jun Li. Study on the catalytic degradation of tetracycline hydrochloride by modified spinel and its mechanism[J].China Surfactant Detergent & Cosmetics, 2025, 55(4): 472-480.

Figures/Tables 12

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References 23

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样品	2θ/（°）	a=b=c/nm	V/nm³	D/nm
x=0	36.88	0.809 6	0.530 65	242
x=0.2	36.89	0.809 2	0.529 87	206
x=0.4	36.86	0.808 3	0.528 10	215
x=0.6	36.82	0.807 5	0.526 54	218
x=0.8	36.78	0.807 6	0.526 73	221

Study on the catalytic degradation of tetracycline hydrochloride by modified spinel and its mechanism

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