高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (11): 2034-2042.doi: 10.7503/cjcu20160377

• 物理化学 • 上一篇    下一篇

赖氨酸辅助高分散金粒子修饰氮掺杂TiO2纳米管催化剂的合成及光催化性能

安会琴1(), 于育才1, 闫琳1, 吴婷婷1, 李晓峰1, 贺晓凌1, 赵莉芝2, 黄唯平3()   

  1. 1. 天津工业大学环境与化学工程学院, 省部共建分离膜与膜过程国家重点实验室, 天津 300387
    2. 天津工业大学材料科学与工程学院, 天津 300387
    3. 南开大学先进能源材料化学教育部重点实验室, 天津 300071
  • 收稿日期:2016-05-26 出版日期:2016-11-10 发布日期:2016-10-20
  • 作者简介:联系人简介: 安会琴, 女, 博士, 讲师, 主要从事无机功能材料合成研究. E-mail: anhuiqinhebei@163.com; 黄唯平, 男, 博士, 教授, 主要从事无机合成及材料催化研究. E-mail: hwp914@nankai.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21501131, 21373120)、 天津工业大学国家级大学生创新创业训练计划项目(批准号: 201510058021)和天津市科技特派员项目(批准号: 15JCTPJC57500)资助

Synthesis of Highly Dispersed Au Nanoparticles Modified N-Doped TiO2 Nanotubes by the Assist of Lysine and Their Photocatalytic Activity

AN Huiqin1,*, YU Yucai1, YAN Lin1, WU Tingting1, LI Xiaofeng1, HE Xiaoling1, ZHAO Lizhi2, HUANG Weiping3,*   

  1. 1. School of Environmental and Chemical Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China
    2. School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
    3. Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Enducation,Nankai University, Tianjin 300071, China
  • Received:2016-05-26 Online:2016-11-10 Published:2016-10-20
  • Contact: AN Huiqin,HUANG Weiping E-mail:anhuiqinhebei@163.com;hwp914@nankai.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21501131, 21373120), the National Training Program of Innovation and Entrepreneurship for Undergraduates of Tianjin Polytechnic University, China(No.201510058021) and the Science and Technology Correspondent Project of Tianjin, China(No.15JCTPJC57500)

摘要:

通过溶胶-凝胶法联合水热合成法制备了氮掺杂TiO2纳米管, 并以该纳米管为载体, 采用绿色无毒的赖氨酸作为链接剂和螯合剂, 一步实现金粒子在TiO2纳米管上的高度分散, 制备得到高分散金粒子修饰氮掺杂TiO2纳米管催化剂(Au/N-TiO2纳米管). 表征了产物的形貌、 结构、 光学特性及组成, 通过紫外光下甲基橙水溶液的光降解率评价产物的光催化活性, 讨论了氮掺杂量、 金负载量、 赖氨酸及焙烧对合成催化剂光催化性能的影响. 结果显示, 在赖氨酸存在下, 金粒子在TiO2纳米管上呈高度分散状态, 未发生聚集. 且与纯TiO2纳米管相比, Au/N-TiO2纳米管显示出更高的光催化活性. Au/N-TiO2纳米管的高催化活性是由于氮掺杂后引起的TiO2带隙能窄化、 金粒子在载体上的高分散状态及金与TiO2形成的肖特恩势垒引起的低电子-空穴复合率共同作用导致的.

关键词: 二氧化钛纳米管, 氮掺杂, 金粒子, 赖氨酸, 光降解甲基橙

Abstract:

N-doped TiO2 nanotubes were synthesized by the combination of sol-gel and hydrothermal methods firstly; and then Au nanoparticles were deposited on the N-doped TiO2 nanotubes by a simple one-pot process with lysine as both the linker and capping agent. The morphology, structure, optical absorption and composition of the samples were characterized by means of TEM, XRD, UV-Vis and XPS. The photodegradation rates of methyl orange under UV light irradiation were used to evaluate the photocatalytic activities of samples. The effects of N content, Au content, lysine and calcination on the photocatalytic activities of Au/N-doped TiO2 nanotubes were discussed. The results exhibit that Au nanoparticles capped by lysine are highly dispersed on the support without any aggregation and the obtained sample exhibits higher photocatalytic activity in comparison with pure TiO2 nanotubes. The improved photocatalytic activity is attributed to the narrower band gap of N-doped TiO2, the high dispersion of Au nanoparticles and the reduced recombination of photogenerated electrons and holes caused by the formation of metal-semiconductor Schottky junction between Au and TiO2.

Key words: TiO2 nanotube, N doping, Au nanoparticle, Lysine, Photodegradation of methyl orange

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