A kinetic study for the degradation of 1,2-dichloroethane by S-doped TiO2 under visible light

Yi Hsing Lin, Shih Han Chou, Hsin Chu

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19 Citations (Scopus)

Abstract

Sulfur-doped TiO2 prepared by a sol-gel method to degrade 1,2-dichloroethane (1,2-DCE) under visible light irradiation was investigated. The photocatalytic decomposition rate of 1,2-DCE under visible light condition was expected to increase via doping. Additionally, the physical and chemical properties of the photocatalysts measured by thermo-gravimetric/differential- thermal analysis, X-ray diffraction, UV-Vis spectroscopy, elemental analysis, BET surface analysis, and X-ray photoelectron spectroscopy were obtained for a better understanding of TiO2 particles. The results indicate that S-doped TiO2 are mainly nano-size with an anatase-phase structure, and doping sulfur leads to the formation of Ti-O-S in the TiO2 lattice. The role of S6+ as h+/e- traps promotes photocatalytic activity, and prevents h+/e- recombination. S-doped TiO2 photocatalysts show superior photocatalytic activity compared to that of TiO2. Among all photocatalysts, 10 mol% S/TiO2 exhibits the best decomposition rate of 1,2-DCE. The 10 mol% S-doped TiO2 was, therefore, chosen for the kinetic study. A variety of models were used for best fit of the kinetic data in this study. The results demonstrate that the bimolecular Langmuir-Hinshelwood kinetic model is more feasible than other two to illustrate the photocatalytic reaction of 1,2-DCE.

Original languageEnglish
Article number2539
JournalJournal of Nanoparticle Research
Volume16
Issue number8
DOIs
Publication statusPublished - 2014 Aug

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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