催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (10): 1271-1276.DOI: 10.3724/SP.J.1088.2010.00408

• 研究论文 • 上一篇    下一篇

Pt 改性的高结晶度 TiO2 晶须的光催化性能

丁玉兰, 柏扬, 李伟, 陈闪山, 朱育丹, 朱银华, 杨祝红, 陆小华   

  1. 南京工业大学材料化学工程国家重点实验室, 江苏南京 210009
  • 收稿日期:2010-10-25 出版日期:2010-10-25 发布日期:2014-03-04

Highly Crystalline TiO2 Whisker Modified with Pt and Its Photocatalytic Performance

DING Yulan, BAI Yang, LI Wei, CHEN Shanshan, ZHU Yudan, ZHU Yinhua, YANG Zhuhong*, LU Xiaohua   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China
  • Received:2010-10-25 Online:2010-10-25 Published:2014-03-04

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摘要： 以二钛酸钾 (K2Ti2O5) 为前驱体, 通过离子交换和 800oC 焙烧制备了 TiO2晶须 (TiO2(800oC)), 并采用乙二醇胶体法, 在 TiO2(800oC) 样品上负载 1% Pt 纳米颗粒制成了 Pt/TiO2(800oC 催化剂. 采用 X 射线衍射、扫描电镜、透射电镜、X 荧光光谱和低温 N2 吸附-脱附等技术对催化剂进行了表征, 并考察了该催化剂光催化降解苯酚活性及稳定性. 结果表明, TiO2(800oC)样品为结晶度较高的纯锐钛矿 TiO2, 载 Pt 后催化活性提高到原来的 2.3 倍, 具有很高的单位比表面积活性. 催化剂经 10 次重复使用后, Pt 流失量仅为 6%, 活性为新鲜催化剂的 91%. 而低结晶度的纯锐钛矿或混晶的 TiO2 负载 Pt 催化剂的活性和稳定性均不及 Pt/TiO2(800oC).

关键词: 铂, 二氧化钛, 晶须, 光催化, 苯酚, 降解

Abstract: Highly thermally stable anatase TiO2 whisker has been synthesized by ion-exchange and calcination at high temperature (800oC) using K2Ti2O5 as the precursor. Pt nanoparticles (1%) were loaded on this TiO2 to prepare a Pt/TiO2 catalyst by the glycol-colloidal method. The catalyst samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray fluo-rescence, and N2 adsorption-desorption measurements. Photocatalytic performance of the Pt/TiO2 catalyst was measured by phenol degrada-tion. The catalytic activity of Pt/TiO2 was 2.3 times that of TiO2 whisker, and the activity on per unit surface area was high. The Pt/TiO2 cata-lyst was stable after reuse 10 times, and it maintained 91% of its initial activity because the loss of Pt was only 6%.

Key words: platinum, titanium dioxide, whisker, photocatalysis, phenol, degradation