Journal of Guangxi Normal University(Natural Science Edition) ›› 2025, Vol. 43 ›› Issue (4): 165-174.doi: 10.16088/j.issn.1001-6600.2024090801

• Ecology and Environmental Science Research • Previous Articles     Next Articles

Effect of Montmorillonite-Humic Acid Composite Particles on Photolysis of Tetracycline

NIE Qinping, WANG Zirui, HOU Xiaomin, WU Qingfeng*   

  1. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou Hubei 434023, China
  • Received:2024-09-08 Revised:2024-11-14 Online:2025-07-05 Published:2025-07-14

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Abstract: Suspended particulate matter (SPM) is an important component of natural water body and can significantly influence the photolytic behavior of water pollutants. A comprehensive understanding about the photochemical behavior of water pollutants in natural waters requires consideration of the presence of SPM. In this study, montmorillonite-humic acids (MMT-HAs) composite particle was prepared to simulate SPM in natural waters, and their effects on the photolysis of tetracycline (TC) were investigated. The results demonstrated that the presence of MMT-HAs composite particle in water significantly enhanced the photolysis of TC, with the photolytic kinetics following a pseudo-first-order model. Electron spin resonance spectra and free radical quenching experiments indicated that the photoactive components (MMT and humic acids) in the composite particle induced the generation of reactive oxygen species under light exposure, contributing to the enhanced photolysis of TC. Comparative analysis of the photolysis of TC in the MMT and MMT-HAs particle systems and adsorption experiments further revealed that the promoted photolysis of TC was also related to the interfacial interaction between MMT-HAs composite particles and TC molecules. The formation of surface complex between amino groups of TC and the negatively charged sites on MMT surface facilitated light absorption or electron transfer, thereby accelerating the photolysis of TC. The promotion of TC photolysis by MMT-HAs composite particles was the result of the combined action of these two mechanisms. Photoproduct analysis indicated that the hydroxyl radical addition to the aromatic ring of TC, as well as demethylation, deamination and dehydration in the side chains were the main degradation pathways of TC in the composite particle systems. The findings can provide valuable insights into the photolytic behavior of water pollutants in natural waters.

Key words: suspended particles, montmorillonite, humic acid, tetracycline, photolysis, free radical, interfacial adsorption

CLC Number:  TQ424;X52
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