| TiO2/Ti光电极电助光催化降解甲草胺的研究 |
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| 引用本文： | 韩蕾,刘惠玲,穆军,梁占国. TiO2/Ti光电极电助光催化降解甲草胺的研究[J]. 环境科学学报, 2014, 34(4): 908-913 |
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| 作者姓名： | 韩蕾 刘惠玲 穆军 梁占国 |
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| 作者单位： | 1. 哈尔滨工业大学市政环境工程学院, 城市水资源与水环境国家重点实验室, 哈尔滨 150090;2. 大连交通大学环境与化学工程学院, 大连 116028;哈尔滨工业大学市政环境工程学院, 城市水资源与水环境国家重点实验室, 哈尔滨 150090;大连交通大学环境与化学工程学院, 大连 116028;大连交通大学环境与化学工程学院, 大连 116028 |
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| 基金项目： | 国家自然科学基金资助项目（No.50678044） |
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| 摘 要： | 采用阳极氧化法制备了TiO2/Ti光电极，并通过电助光催化的方法研究了恒电流法和恒电压法对甲草胺的降解效率.实验证实了在光催化和电催化之间存在协同效应，反应溶液中加入Na2SO4电解质后，SO42-可以被价带空穴氧化成强氧化性的S2O82-，继而可以氧化处理物质，提高甲草胺的降解效率.实验结果表明：甲草胺在羟基自由基的作用下通过羟基化作用和脱烷作用，发生断键、开环等一系列的氧化还原反应，最终生成CO2和H2O等无机小分子物质.
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| 关 键 词： | TiO2/Ti光电极 阳极氧化 电助光催化 甲草胺 |
| 收稿时间： | 2013-06-04 |
Electron-assisted photocatalytic degradation of alachlor using TiO2/Ti photoelectrodes |
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| HAN Lei,LIU Huiling,MU Jun and LIANG Zhanguo. Electron-assisted photocatalytic degradation of alachlor using TiO2/Ti photoelectrodes[J]. Acta Scientiae Circumstantiae, 2014, 34(4): 908-913 |
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| Authors: | HAN Lei LIU Huiling MU Jun LIANG Zhanguo |
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| Affiliation: | 1. State Key Laboratory of Urban Water Resources and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090;2. School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028;State Key Laboratory of Urban Water Resources and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090;School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028;School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028 |
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| Abstract: | TiO2/Ti photoelectrodes were prepared by anodization in this study. The electron-assisted photocatalytic degradation of alachlor using the as-prepared photoelectrodes under potentiostatic and galvanostatic conditions was investigated, and a synergistic effect between the photocatalysis and electrocatalysis was concluded. The degradation efficiency of alachlor could be enhanced after the addition of Na2SO4, as SO42- was ready to be oxidized by valence band hole into S2O82- with higher oxidative state. Results showed that bond-breaking and ring-open reactions of alachlor happened in terms with hydroxylation and dealkylation under the force of hydroxyl radicals. Alachlor was finally mineralized into inorganic matters such as CO2 and H2O. |
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| Keywords: | TiO2/Ti phtoelectrodes anodization electrochemically assisted photocatalytic alachlor |
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