Imaging Science and Photochemistry ›› 2018, Vol. 36 ›› Issue (3): 275-282.DOI: 10.7517/j.issn.1674-0475.2018.03.008

Previous Articles     Next Articles

Facial Fabrication of CdS Nanoparticles Sensitized TiO2 Nanomesh with Enhanced Photocatalytic Activity

LI Yue, SONG Yuze, TAO Yanzhong, GAO Fengxian, TANG Ning   

  1. Department of Material and Chemistry Engineering, Henan University of Engineering, Zhengzhou 450007, Henan, P. R. China
  • Received:2017-08-15 Revised:2017-09-15 Online:2018-05-15 Published:2018-05-15

Abstract: CdS nanoparticles coated on TiO2 mesh with high photocatalytic activity were successfully synthesized by a simple anodic oxidation method combined with continuous ion layer adsorption method. The CdS nanoparticles were evenly distributed on the top surface of the TiO2 nanotubes without clogging the tube entrances. Compared with the unmodified TiO2, the CdS/TiO2 composited catalyst possessed extended light absorption region and highest photocatalytic activities. After 120 min of irradiation, MB was degraded with the removal ratio of 71.3% on the bare TiO2 mesh, much lower than 98.3% on the CdS/TiO2 composited catalyst. Furthermore, the highest photocurrents were obtained on CdS/TiO2 composited catalyst when the depositing cycles of CdS reached to 15. The improved photodegradation efficiency on the composited catalyst mainly results from the enhanced visible-light absorption and lowest recombination rate of the electron-hole pairs due to the narrow-band-gap semiconductor of CdS.

Key words: TiO2 mesh, CdS, nanocomposites, photocatalysis