黄铁矿光化学氧化降解微囊藻毒素-LR的机制
发布时间:2018-06-23 23:19
本文选题:黄铁矿 + 光化学降解 ; 参考:《环境科学》2017年09期
【摘要】:在可见光(λ420 nm)照射和中性条件(p H=6.8)下,采用天然黄铁矿降解微囊藻毒素MC-LR,XRD和SEM检测表明黄铁矿为层状结构,反应前后黄铁矿表面XPS的表征说明矿物表面存在着S缺陷和缺陷位点Fe(Ⅱ)到Fe(Ⅲ)的转化过程.ESR检测显示黄铁矿光化学反应体系涉及·OH机制.HPLC和LC-MS结果显示可见光照射能有效活化黄铁矿降解MC-LR,反应10 h时能完全降解MC-LR,20 h时对MC-LR矿化率达到约60%,据实验结果推测出黄铁矿光化学氧化MC-LR的两条反应途径.
[Abstract]:Under visible light (位 420 nm) irradiation and neutral condition (pH 6.8), the degradation of microcystins by natural pyrite was characterized by XRD and SEM. XPS characterization of pyrite surface before and after reaction showed that there were S-defects and the transformation process from Fe (鈪,
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