| Dy/WO3光催化降解罗丹明B的反应机理 |
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| 引用本文： | 刘华俊,彭天右,彭正合,戴珂.Dy/WO3光催化降解罗丹明B的反应机理[J].武汉大学学报(理学版),2007,53(2):127-132. |
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| 作者姓名： | 刘华俊 彭天右 彭正合 戴珂 |
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| 作者单位： | 1. 武汉大学,化学与分子科学学院,湖北,武汉,430072;襄樊学院,化学与生物科学系,湖北,襄樊,441053
2. 武汉大学,化学与分子科学学院,湖北,武汉,430072 |
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| 基金项目： | 国家自然科学基金;国家高技术研究发展计划(863计划);湖北省杰出人才基金;湖北省教育厅科研项目 |
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| 摘 要： | 在稀土Dy掺杂的WO3光催化降解罗丹明B（RB）体系中，采用紫外-可见吸收光谱、高效液相色谱和电喷雾质谱等技术测定了不同辐照时间下RB的降解中间产物，发现RB的降解过程以苯环的开环氧化反应为主，脱乙基反应为辅．同时发现降解中间产物有脱去1～4个乙基的RB分子碎片；质谱分析发现降解中间产物除了存在上述脱乙基RB的分子碎片外，还存在RB、脱乙基RB的羟基化产物以及结构难以确定的小分子．通过上述分析方法的综合，推出了Dy／WO3光催化降解RB的初步机理．
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| 关 键 词： | 光催化降解 罗丹明B 反应机理 WO3纳米粉体 |
| 文章编号： | 1671-8836(2007)02-0127-06 |
| 修稿时间： | 2006年11月16 |
Photocatalytic Degradation Mechanism of RB over Dy-Doped WO3 Photocatalysts |
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| LIU Huajun,PENG Tianyou,PENG Zhenghe,DAI Ke.Photocatalytic Degradation Mechanism of RB over Dy-Doped WO3 Photocatalysts[J].JOurnal of Wuhan University:Natural Science Edition,2007,53(2):127-132. |
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| Authors: | LIU Huajun PENG Tianyou PENG Zhenghe DAI Ke |
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| Abstract: | The UV-Vis absorption spectra,high performance liquid chromatograph(HPLC) and electric spray interface mass spectra(ESI-MS) of RB(rhodamine B) were measured under different irradiation time during the photocatalytic procedures of Dy-doped WO3 nanoparticles suspension system.The experimental results indicated that the photodegradation mechanism of the RB mainly involved the broken of benzene ring in RB combined with de-ethylation and hydroxylation process.Some intermediates can be attributed to RB molecular fragments which resulted from severing one,two,three and/or four ethyl from RB,respectively.Moreover,hydroxylation intermediates of RB and its de-ethylation products have also been determined by mass spectra.According to the above-mentioned experimental facts,the primary photocatalytic degradation mechanism of RB over Dy-doped WO3 photocatalysts was proposed. |
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| Keywords: | photocatalytic degradation rhodamine B reaction mechanism WO3 nanopowder |
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