蒙脱石-腐殖酸复合颗粒物对水体中四环素光解的影响

doi:10.16088/j.issn.1001-6600.2024090801

摘要/Abstract

摘要： 悬浮颗粒物是自然水体的重要组分,能对水体中污染物的光化学行为产生重要影响。本文以蒙脱石-腐殖酸复合颗粒模拟水体悬浮颗粒物,研究其对四环素(TC)光解行为的影响。结果显示,水体中蒙脱石-腐殖酸颗粒物的存在显著加速四环素的光解,其光解动力学符合准一级动力学模型。电子自旋共振波谱分析和自由基淬灭实验表明,蒙脱石-腐殖酸复合颗粒物中的光活性成分(蒙脱石、腐殖酸)在光照条件下诱导活性氧自由基的产生,自由基与四环素之间的进一步反应加速其光解。蒙脱石和蒙脱石-腐殖酸复合颗粒体系中的光解对比实验以及吸附实验进一步表明,复合颗粒物对四环素光解的促进作用还与界面吸附密切相关。四环素分子与蒙脱石表面吸附点位之间的界面作用有利于光能量的吸收和电子转移,进而加速光解。复合颗粒物对四环素光解的促进作用是这2种机制共同作用的结果。光解产物分析表明,在复合颗粒物存在条件下,苯环上的羟基加成、脱甲基和脱水是四环素分子降解的主要反应途径。本研究为全面理解真实水体环境中抗生素污染物的光化学行为提供有价值的参考。

关键词: 悬浮颗粒物, 蒙脱石, 腐殖酸, 四环素, 光解, 自由基, 界面吸附

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

中图分类号: TQ424;X52

聂钦坪, 王子瑞, 候晓敏, 吴青峰. 蒙脱石-腐殖酸复合颗粒物对水体中四环素光解的影响[J]. 广西师范大学学报（自然科学版）, 2025, 43(4): 165-174.

NIE Qinping, WANG Zirui, HOU Xiaomin, WU Qingfeng. Effect of Montmorillonite-Humic Acid Composite Particles on Photolysis of Tetracycline[J]. Journal of Guangxi Normal University(Natural Science Edition), 2025, 43(4): 165-174.

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