催化学报 ›› 2012, Vol. 33 ›› Issue (6): 993-999.DOI: 10.3724/SP.J.1088.2012.11127

• 研究论文 • 上一篇    下一篇

S 掺杂 S-TiO2/SiO2 可见光响应光催化剂的制备及性能

陈孝云1,*, 陆东芳2, 林淑芳1   

  1. 1福建农林大学材料工程学院, 福建福州 350002; 2福建农林大学园林学院, 福建福州 350002
  • 收稿日期:2011-11-22 修回日期:2012-01-16 出版日期:2012-05-30 发布日期:2012-05-30

Preparation and Properties of Sulfur-Doped Visible-Light Response S-TiO2/SiO2 Photocatalyst

CHEN Xiaoyun1,*, LU Dongfang2, LIN Shufang1   

  1. 1College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; 2College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
  • Received:2011-11-22 Revised:2012-01-16 Online:2012-05-30 Published:2012-05-30

摘要: 以四氯化钛为钛源, 硫脲为硫源, 采用液相水解-沉淀法制备了 S 掺杂的 TiO2/SiO2 (S-TiO2/SiO2) 催化剂, 并以苯酚为模型物, 考察了催化剂在可见光区、紫外光区和太阳光下的光催化活性, 以及催化剂的使用寿命和分离性能. 采用 X 射线光电子能谱、傅里叶变换红外光谱、紫外-可见漫反射光谱、X 射线衍射、透射电镜及 N2 吸附-脱附等技术对催化剂进行了表征. 结果表明, S 以+6 价形式进入 TiO2 体相并置换晶格中的 Ti4+, 适量 S 掺杂的 S-TiO2/SiO2 在紫外光区、可见光区和太阳光下均表现出较高的光催化活性. SiO2 与 TiO2 界面间有 Ti–O–Si 键形成, 结合牢固. S 掺杂在 TiO2 表面生成 Ti–O–S 键, 形成新的能级结构, 使光催化剂在 450~550 nm 产生吸收, 诱发 TiO2 可见光催化活性; 同时提高了 TiO2 表面羟基数量. SiO2 的加入可减小 TiO2 颗粒的平均尺寸, 增大催化剂的比表面积, 改善催化剂的分离性能, 提高催化剂的使用寿命.

关键词: 二氧化钛, 二氧化硅, 硫掺杂, 可见光, 光催化

Abstract: S-doped visible-light response S-TiO2/SiO2 photocatalyst samples were prepared by a hydrolysis-precipitation method. The photocatalytic activity was investigated by the degradation of phenol. The separability of S-TiO2/SiO2 was determined by sedimentation. X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, X-ray diffraction, transmission electron microscopy, and N2 adsorption-desorption were used for catalyst characterization. The results showed that cationic S6+ was incorporated into TiO2 lattice and substituted part of Ti4+. S-TiO2/SiO2 with suitable S-doping exhibited higher activity under ultraviolet light, visible light, and solar irradiation. S-TiO2/SiO2 exhibited better decanting ability and less deactivation. Doped-S can form a new bond of Ti–O–S above the valence band of TiO2 to extend the adsorption edge to 450–550 nm, and can increase amount of surface OH of TiO2. The addition of SiO2 can form a new bond of Ti–O–Si, beneficial to the high dispersion, and larger surface area of S-TiO2/SiO2.

Key words: titania, silica, sulfur-doping, visible light, photocatalysis