A kinetic study for the degradation of 1,2-dichloroethane by S-doped TiO2 under visible light
Source abstract
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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Advanced Photocatalysis Techniques
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