广西师范大学学报（自然科学版）2025，Vol.43Issue(4)：165-174,10.DOI:10.16088/j.issn.1001-6600.2024090801
蒙脱石-腐殖酸复合颗粒物对水体中四环素光解的影响
Effect of Montmorillonite-Humic Acid Composite Particles on Photolysis of Tetracycline
摘要
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.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Key words
suspended particles/montmorillonite/humic acid/tetracycline/photolysis/free radical/interfacial adsorption分类
化学化工引用本文复制引用
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):165-174,10.基金项目
国家自然科学基金(52262042) （52262042）
湖北省高等学校优秀中青年科技创新团队计划项目(T2020008) （T2020008）
