UV/Fenton 体系对微囊藻毒素-LR 的去除及降解机制研究。
Study on the removal and degradation mechanism of microcystin-LR by the UV/Fenton system.
机构信息
School of Resources, Environment and Materials, Guangxi University, No. 100 Daxue Road, Nanning, Guangxi 530004, PR China.
School of Resources, Environment and Materials, Guangxi University, No. 100 Daxue Road, Nanning, Guangxi 530004, PR China; Guangxi Key Laboratory of Electrochemical Energy Materials, Institute of Optical Materials and Chemical Biology, School of Chemistry and Chemical Engineering, Guangxi University, No. 100 Daxue Road, Nanning 530004, PR China.
出版信息
Sci Total Environ. 2023 Sep 20;892:164665. doi: 10.1016/j.scitotenv.2023.164665. Epub 2023 Jun 3.
Microcystin-LR (MC-LR) is highly hepatotoxic and potentially carcinogenic to humans. Therefore, removing MC-LR from water bodies is of paramount importance. This study aimed to investigate the removal efficacy of the UV/Fenton system on MC-LR from copper-green microcystin and to explore its degradation mechanism in simulated real algae-containing wastewater. The results showed that at an initial concentration of 5 μg·L, a combination of 300 μmol·L HO, 125 μmol·L FeSO, and 5 min of UV irradiation under average radiation intensity of 48 μW·cm resulted in a removal efficiency of 90.65 % for MC-LR. The reduction of extracellular soluble microbial metabolites of Microcystis aeruginosa confirmed the UV/Fenton method's degradation efficiency for MC-LR, while the observation of the functional group CH and OCO in the treatment group indicated effective binding sites in the coagulation process. However, the presence of humic substances in algal organic matter (AOM) and some proteins and polysaccharides in the algal cell suspension competed with MC-LR for HO·, resulting in a decreased removal effect (78.36 %) in simulated actual algae-containing wastewater. These quantitative results provide an experimental basis and theoretical foundation for controlling cyanobacterial water blooms and ensuring drinking water quality safety.
微囊藻毒素-LR（MC-LR）对人类具有高度的肝毒性和潜在致癌性。因此，从水体中去除 MC-LR 至关重要。本研究旨在探讨 UV/Fenton 体系对铜绿微囊藻中 MC-LR 的去除效果，并探索其在模拟实际含藻废水中的降解机制。结果表明，在初始浓度为 5μg·L 时，300μmol·L 的 HO、125μmol·L 的 FeSO 和 5min 的 UV 辐照（平均辐射强度为 48μW·cm）的组合可使 MC-LR 的去除率达到 90.65%。铜绿微囊藻胞外可溶微生物代谢物的减少证实了 UV/Fenton 法对 MC-LR 的降解效率，而处理组中 CH 和 OCO 官能团的观察表明了在混凝过程中有有效的结合位点。然而，藻类有机物（AOM）中的腐殖质物质和藻类细胞悬浮液中的一些蛋白质和多糖与 HO·竞争，导致在模拟实际含藻废水中的去除效果降低（78.36%）。这些定量结果为控制蓝藻水华和确保饮用水质量安全提供了实验依据和理论基础。
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