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化学学报
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化学学报 ›› 2012, Vol. 0 ›› Issue (05): 567-571 .DOI: 10.6023/A1108312 上一篇    下一篇

研究论文

过渡金属掺杂和碳纳米管(CNT)接枝双重改性TiO2 光催化剂

马磊, 陆金东, 何洪波, 李春忠, 陈爱平   

  1. 华东理工大学材料科学与工程学院 超细材料制备与应用教育部重点实验室 上海 200237
  • 投稿日期:2011-08-31 修回日期:2011-11-07 发布日期:2012-03-17
  • 通讯作者: 陈爱平 E-mail:apchen@ecust.edu.cn
  • 基金资助:

    上海市科委纳米专项(No. 1052nm02400)和国家自然科学基金(No. 20925621)资助项目.

Preparation of TiO2 Photocatalyst Dual-modified by Transition Metal Doping and Carbon Nanotube (CNT) Grafting

Ma Lei, Lu Jindong, He Hongbo, Li Chunzhong, Chen Aiping   

  1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237
  • Received:2011-08-31 Revised:2011-11-07 Published:2012-03-17
  • Supported by:

    Project supported by the Nanotechnology Special Projects of Science and Technology Commission of Shanghai Municipality (No. 1052nm02400) and National Natural Science foundation of China (No. 20925621).

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提出了一种过渡金属掺杂和碳纳米管(CNT)双重改性TiO2 的新方法: 首先采用溶胶-凝胶法合成掺杂镍和铁的二氧化钛基催化剂, 然后采用流化床化学气相沉积方法(FBCVD)在二氧化钛基催化剂表面接枝生长CNT, 得到CNT/Fe-Ni/TiO2 复合光催化剂. 通过X 射线衍射、扫描电子显微镜、比表面分析、拉曼光谱、紫外-可见吸收光谱、荧光光谱等方法考察了双重改性复合光催化剂CNT/Fe-Ni/TiO2 的结构和性能, 通过降解亚甲基蓝溶液评价了双重改性复合光催化剂的活性. 结果表明, 在TiO2 表面接枝的CNT 具有较好的石墨化结构, CNT 生长过程中小部分TiO2 由锐钛矿向金红石晶型转变. 过渡金属和CNT 双重改性有效地克服了TiO2 的比表面积小、量子效率低等缺点, 明显提高了TiO2的光催化活性.

关键词: 过渡金属, 碳纳米管, 二氧化钛, 双重改性, 光催化

A new method for the preparation of TiO2 dual-modified by transition metal doping and carbon nanotube (CNT) grafting was proposed. Fe-NiO/TiO2 was prepared by sol-gel method. Then CNTs were grafted on Fe-NiO/TiO2 by fluidized bed chemical vapor deposition (FBCVD) method. The dual-modified CNT/Fe-Ni/TiO2 composite photocatalyst has been characterized by X-ray diffraction (XRD), Raman spectra, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV-Vis absorption spectra and photoluminescence spectra. The photocatalytic activities of prepared samples were investigated by the photodegradation of methylene blue (MB). The results show that CNT grafted on TiO2 had good graphite structure, and small part of TiO2 was transformed from anatase to rutile during FBCVD process. Double modification of transition metals and CNT can effectively overcome intrinsic defects of TiO2 in small specific surface area and low quantum efficiency. And the photocatalytic activity has been improved significantly.

Key words: transition metal, carbon nanotube, TiO2, dual modification, photocatalysis