Nd2O3/TiO2光催化剂的光生羟基自由基和光活性

doi:10.7517/j.issn.1674-0475.2006.03.197

影像科学与光化学 ›› 2006, Vol. 24 ›› Issue (3): 197-203.DOI: 10.7517/j.issn.1674-0475.2006.03.197

Nd₂O₃/TiO₂光催化剂的光生羟基自由基和光活性

李慧泉¹, 陈伟凡², 崔玉民¹

1. 阜阳师范学院, 化学系, 安徽, 阜阳, 236041;
2. 南京理工大学, 国家特种超细粉体工程技术研究中心, 江苏, 南京, 210094

收稿日期:2005-12-13 修回日期:2006-02-20 出版日期:2006-05-23 发布日期:2006-05-23
通讯作者: 李慧泉,E-mail:huiquanli@126.com.
基金资助:
安徽省自然科学基金项目(050450301);安徽省高等学校青年教师科研项目(2005jq1131)

Photoinduced Hydroxyl Radicals and Photocatalytic Performance of Nd₂O₃/TiO₂ Photocatalysts

LI Hui-quan¹, CHEN Wei-fan², CUI Yu-min¹

1. Chemistry Department, Fuyang Normal College, Fuyang 236041, Anhui, P. R. China;
2. National Special Superfine Powder Engineering Research Center, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, P. R. China

Received:2005-12-13 Revised:2006-02-20 Online:2006-05-23 Published:2006-05-23

摘要/Abstract

摘要： 以硝酸钕和钛酸四正丁酯作为前驱体,采用溶胶-凝胶法制备了Nd₂O₃/TiO₂纳米光催化剂,并通过XRD和BET等手段进行了表征.以对苯二甲酸作为探针分子,结合化学荧光技术研究了光催化剂表面羟基自由基的生成;并以甲基橙为光催化降解反应模型化合物,考察了光催化剂的活性.测定了甲基橙在TiO₂和Nd₂O₃/TiO₂(1.0%)光催化剂上的吸附常数.结果表明:Nd₂O₃掺杂使TiO₂的粒径减小,比表面积增大;羟基自由基的生成速率越大,催化剂的催化活性越高.Nd₂O₃掺杂有利于反应底物在催化剂表面的吸附,Nd₂O₃的最佳掺入量为Nd/Ti(摩尔比)=1.0%.

关键词: 光催化, 二氧化钛, 三氧化二钕, 羟基自由基, 甲基橙

Abstract: Nd₂O₃/TiO₂ photocatalysts were prepared by sol-gel method using neodymium nitrate and tetrabutyl titanate as precursors,and characterized by means of XRD and BET.After the doped with Nd₂O₃,the particle diameter of catalyst was decreased,the specific surface area was increased,the formation rate of hydroxyl radical on the catalyst was increased,and the catalytic activity was improved.Using methyl orange as the model compound of the photocatalytic degradation reaction,the activity of the prepared photocatalysts was investigated in suspension irradiated by high-pressure mercury lamp;and the hydroxyl radical produced in the supernatant of the irradiated catalyst suspension containing terephthalic acid were also investigated by measuring the fluorescence derived by the reaction with terephthalic acid.As a result,the addition of Nd₂O₃ to TiO₂ notably enhanced its photocatalytic activity.The adsorption constants of methyl orange on the Nd₂O₃ doped catalysts and the nonmodified TiO₂ catalyst were evaluated,and the result showed the adsorption of methyl orange on the Nd₂O₃/TiO₂ catalysts was improved.The optimum loading amount of Nd ion is 1.0%(molar ratio).

Key words: photocatalysis, TiO₂, Nd₂O₃, hydroxyl radicals, methyl orange

中图分类号:

O643

李慧泉, 陈伟凡, 崔玉民. Nd₂O₃/TiO₂光催化剂的光生羟基自由基和光活性[J]. 影像科学与光化学, 2006, 24(3): 197-203.

LI Hui-quan, CHEN Wei-fan, CUI Yu-min. Photoinduced Hydroxyl Radicals and Photocatalytic Performance of Nd₂O₃/TiO₂ Photocatalysts[J]. Imaging Science and Photochemistry, 2006, 24(3): 197-203.

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Nd₂O₃/TiO₂光催化剂的光生羟基自由基和光活性

Photoinduced Hydroxyl Radicals and Photocatalytic Performance of Nd₂O₃/TiO₂ Photocatalysts

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