[黄铁矿对微囊藻毒素-LR的光化学降解机制]
[Mechanism of Photochemical Degradation of MC-LR by Pyrite].
作者信息
Zhou Wei, Fang Yan-Fen, Zhang Yu, Wu Chun-Hong, Huang Ying-Ping
机构信息
College of Biology and Pharmacy, China Three Gorges University, Yichang 443002, China.
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China.
出版信息
Huan Jing Ke Xue. 2017 Sep 8;38(9):3762-3768. doi: 10.13227/j.hjkx.201603216.
Pyrite was used as catalyst to degrade Microcystin-LR (MC-LR) at pH 6.8 under visible light irradiation (>420 nm). X-ray diffraction (XRD) and scanning electron microscope (SEM) characterization showed that pyrite had the layered structure. The ion state of pyrite before and after the reaction was identified using X-Ray Photoelectron Spectroscopy (XPS), confirming the conversion process of Fe(Ⅱ) to Fe(Ⅲ) on the sulfur defect sites. Electron Spin Resonance (ESR) test showed that pyrite photochemical reaction produced hydroxyl radical (·OH). The results of high performance liquid chromatography (HPLC) and liquid chromatograph-mass spectrometer (LC-MS) showed that visible light irradiation could effectively activate pyrite to degrade MC-LR. The degradation rate of MC-LR reached 100% after 10 hours and the mineralization rate reached 60% after 20 hours. The two reaction pathways of photochemical oxidation of MC-LR by pyrite were discussed.
在可见光（>420 nm）照射下，以黄铁矿为催化剂在pH 6.8的条件下降解微囊藻毒素-LR（MC-LR）。X射线衍射（XRD）和扫描电子显微镜（SEM）表征表明黄铁矿具有层状结构。利用X射线光电子能谱（XPS）确定了反应前后黄铁矿的离子状态，证实了硫缺陷位点上Fe(Ⅱ)向Fe(Ⅲ)的转化过程。电子自旋共振（ESR）测试表明黄铁矿光化学反应产生了羟基自由基（·OH）。高效液相色谱（HPLC）和液相色谱-质谱联用仪（LC-MS）的结果表明，可见光照射可有效激活黄铁矿降解MC-LR。10小时后MC-LR的降解率达到100%，20小时后矿化率达到60%。讨论了黄铁矿光化学氧化MC-LR的两条反应途径。
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