Chemical Industry and Engineering Progress ›› 2018, Vol. 37 ›› Issue (01): 175-181.DOI: 10.16085/j.issn.1000-6613.2017-0725

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Tryptophan assisted synthesis of spherical nanometer TiO2with enhanced photocatalytic activities

LI Bin1,3, CHEN Xingwei1, ZHANG Tianyong1,2, JIANG Shuang1,3, ZHANG Guanghui1, WU Wubin1   

  1. 1 Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China;
    2 Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Tianjin 300354, China;
    3 Tianjin Engineering Research Center of Functional Fine Chemicals, Tianjin 300354, China
  • Received:2017-04-24 Revised:2017-05-11 Online:2018-01-05 Published:2018-01-05

色氨酸辅助合成光催化活性增强的球形纳米TiO2

李彬1,3, 陈星炜1, 张天永1,2, 姜爽1,3, 张光辉1, 吴武斌1   

  1. 1 天津大学化工学院, 天津市应用催化科学与工程重点实验室, 天津 300354;
    2 天津化学化工协同创新中心, 天津 300354;
    3 天津市功能精细化学品技术工程中心, 天津 300354
  • 通讯作者: 张天永,教授,博士生导师;姜爽,讲师,研究方向为精细化学品合成。
  • 作者简介:李彬(1982-),男,博士,副教授,硕士生导师。
  • 基金资助:
    国家自然科学基金(21276187)、天津市自然科学基金(16JCYBJC20800)及天津市科技创新平台计划(14TXGCCX00017)项目。

Abstract: The spherical structure TiO2 nano photocatalyst was prepared by simple hydrolysis followed by calcination with L-tryptophan (L-Trp) as biological template. The prepared TiO2 was characterized by X-ray diffraction, scanning electron microscopy, infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and N2 adsorption-desorption. The L-Trp played a crucial role in the formation of photocatalysts, which could induce the formation of spherical structure TiO2. The photocatalytic activity of TiO2 samples prepared at different calcination temperatures was investigated. The results showed that the TiO2 prepared at 550℃ exhibited an excellent photocatalytic activity, and the degradation rate of methyl orange (MO) solution reached about 95% under UV light irradiation in 30min, which was mainly due to the synergistic effect of large BET surface area and spherical structure. The results of photocatalytic stability test indicated that the prepared TiO2 nanomaterials could be used as practical and effective photocatalysts for the degradation of organic dyes under UV light irradiation. Furthermore, the possible growth mechanism of spherical structure TiO2 nanoparticles supported by L-Trp was discussed.

Key words: tryptophan, photocatalysis, titanium dioxide, spherical structure, mechanism

摘要: 以L-色氨酸(L-Trp)为生物模板,采用简单水解及煅烧后制备了球形结构TiO2纳米光催化剂。通过X射线衍射、扫描电子显微镜、红外光谱、紫外-可见漫反射光谱、光致发光光谱和N2吸附-解吸等方法对制得的TiO2纳米材料进行表征。在催化剂合成过程中,L-Trp作为生物模板发挥至关重要的作用,能够指导球形结构纳米TiO2的形成。考察了不同煅烧温度下制备的TiO2样品光催化活性,结果表明550℃时制备的TiO2样品具有优异的光催化活性,紫外光照射30min对甲基橙溶液的降解率达到95%左右,主要是由于较大比表面积和球形结构的协同效应。光催化剂稳定性实验表明,所制备的TiO2纳米材料可作为一种实用有效的光催化剂用于紫外光照射下降解有机染料。同时,对L-Trp辅助下球形结构TiO2纳米颗粒的可能生长机理进行讨论。

关键词: 色氨酸, 光催化, 二氧化钛, 球形结构, 机理

CLC Number: 

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