物理化学学报 >> 2012, Vol. 28 >> Issue (01): 161-169.doi: 10.3866/PKU.WHXB201228161

催化和表面科学 上一篇    下一篇

离子液体-水混合介质中合成N、F共掺杂宽光域响应多孔TiO2光催化剂及性能

陈孝云1, 陆东芳2, 黄锦锋1, 卢燕凤1, 郑建强1   

  1. 1. 福建农林大学材料工程学院, 福州 350002;
    2. 福建农林大学园林学院, 福州 350002
  • 收稿日期:2011-08-16 修回日期:2011-10-10 发布日期:2011-12-29
  • 通讯作者: 陈孝云 E-mail:chenxy_dicp@126.com
  • 基金资助:

    国家自然科学基金(31000269), 福建省高等学校杰出青年科研人才培育计划(JA11072)和福建省教育厅基金(JA10121)资助项目

Preparation and Properties of N-F Co-Doped TiO2 Photocatalyst with Wide Range Light Response and Multipore Structure from Ionic Liquid-Water Mixture Solvent

CHEN Xiao-Yun1, LU Dong-Fang2, HUANG Jin-Feng1, LU Yan-Feng1, ZHENG Jian-Qiang1   

  1. 1. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China;
    2. College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China
  • Received:2011-08-16 Revised:2011-10-10 Published:2011-12-29
  • Contact: CHEN Xiao-Yun E-mail:chenxy_dicp@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (31000269), Talent Training Program for Distinguished Young Scholars in Universities of Fujian Province, China (JA11072) and Education Department Foundation of Fujian Province, China (JA10121).

摘要: 以TiCl4为钛源, 离子液体-水为混合溶剂, 采用液相水解-沉淀法制得浅黄色的N、F共掺杂宽光域响应多孔TiO2光催化剂(TiONF). 以苯酚为模型物, 考察了TiONF在紫外光区、可见光区及太阳光下催化活性. 采用X射线光电子能谱(XPS)、紫外-可见漫反射光谱(DRS)、透射电镜(TEM)、X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱及低温N2吸附-脱附等技术对TiONF的结构进行表征. 结果表明, 在离子液体-水混合介质中合成适量N、F共掺杂的TiO2在紫外光区、可见光区及太阳光下均表现出较高的活性, 且高于纯水介质中合成TiONF的活性. 离子液体-水混合介质有利于N、F进入TiO2晶格中; N、F共掺杂后在TiO2表面生成Ti―O―N键, 形成新的能级结构, 使催化剂的吸收红移至450-530 nm, 诱发TiO2可见光催化活性; 同时, N、F共掺杂提高了TiO2表面羟基数量; 还提高了TiO2相转变温度, 减缓了相转变速率. 另外, 在离子液体-水混合介质中合成的TiONF较纯水介质中合成的TiONF粒子小、分散性好、比表面积大.

关键词: TiO2, N-F共掺杂, 离子液体, 光催化剂, 可见光

Abstract: A yellow N-F co-doped TiO2 photocatalyst (TiONF) exhibited high activity over a wide light spectrum range and a multipore structure was prepared by a hydrolysis-precipitation method using an ionic liquid ([Bmim]PF6)-water mixture as the solvent and TiCl4 as the precursor. Photocatalytic activity was investigated by the photocatalytic degradation of phenol under ultraviolet (UV), artificial visible (Vis), and solar light irradiation. X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), spectroscopy, and N2 adsorption-desorption were used for catalyst characterization. The results show that TiONF synthesis in an ionic liquid-water mixture solvent with suitable N-F doping gives high activity under UV, Vis, and solar light irradiation, and the activities are higher than those obtained by synthesis in pure water. The ionic liquid-water mixture solvent leads to N and F being incorporated into the TiO2 lattice and N-F co-doping can increase the amount of surface OH- on TiO2. The new bandgap formed by N-F doping can induce a second adsorption edge (450-530 nm), which can be excited by Vis irradiation and induce Vis activity. N-F co-doping retards the phase transformation. In addition, an ionic liquid-water mixture as a solvent benefits the dispersion of TiO2, increases the SBET and reduces the particle size.

Key words: TiO2, N-F co-doping, Ionic liquid, Photocatalyst, Visible light

MSC2000: 

  • O643