金属多酚改性光催化膜原位去除水中四环素

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Abstract A metal polyphenol-modified TiO₂ photocatalytic membrane ((TA-Fe³⁺)/TiO₂-PVDF) was prepared by a layer-by-layer self-assembly method using polyvinylidene difluoride (PVDF) membranes as the substrate, and an in situ photocatalytic membrane filtration system was constructed to degrade tetracycline in water. The structures of the photocatalytic membranes were characterized by SEM, EDS, XRD, FTIR and contact angle meter, and all the characterization results proved the successful coating of ((TA-Fe³⁺)/TiO₂-PVDF) and the enhanced hydrophilicity of the membrane surfaces; and tetracycline as a representative of the antibiotics was selected for the study of the degradation performance, which was achieved at a low dosage (50mg/L) of peroxydisulfate (PMS), a transmembrane pressure of 5 kPa, and an in situ photocatalytic membrane filtration system to degrade tetracycline in water. 250 mW/cm²visible light intensity, the tetracycline degradation rate was always maintained at 80% during 1h operation, the average removal rate of tetracycline was 7.34g/h, and the water flux only decreased by 6% compared with that of the original PVDF membranes, which is suitable for neutral and weakly acidic conditions, and basically unaffected by common ions in the water column and natural organic matter; finally, the mechanism of tetracycline degradation by (TA-Fe³⁺)/TiO₂-PVDF membranes was investigated by active species capture assay and EPR, and it was found that photocatalysis synergistically with PMS oxidation produced ¹O₂, h+, O₂^-· and SO₄^·- as the main active species, and degraded tetracycline by both the free radical and non-free radical pathways.

Key words： metal polyphenols catalytic membrane in situ photocatalysis permonosulfate efficient instantaneous degradation

Received: 24 August 2024

PACS:

X703.1

Corresponding Authors: 杨梓俊,助理研究员,hhuyzj079@163.com E-mail: hhuyzj079@163.com

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	HOU Jun
	XU Xiao
	YANG Jia-lin
	ZHAO Xiao
	YANG Zi-jun

Cite this article:

HOU Jun,XU Xiao,YANG Jia-lin等. In situ removal of tetracycline from water by metal polyphenol-modified photocatalytic membrane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1260-1271.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1260

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