Aluminum sheet-based S-doped TiO2 for photocatalytic decomposition of toxic organic vapors

doi:10.1016/S1872-2067(14)60076-0

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (7): 1189-1195.DOI: 10.1016/S1872-2067(14)60076-0

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Aluminum sheet-based S-doped TiO₂ for photocatalytic decomposition of toxic organic vapors

Wan-Kuen Jo, Hyun-Jung Kang

Department of Environmental Engineering, Kyungpook National University, Daegu, 702-701, Korea

Received:2014-01-05 Revised:2014-03-12 Online:2014-06-28 Published:2014-06-28
Supported by:
This work was supported by the National Research Foundation of Korea Grant Funded by the Korean Government (2011-0027916).

Abstract

Abstract:

S-doped TiO₂ (S-TiO₂) films were immobilized on flexible low-cost aluminum sheets (S-TiO₂-AS) using a sol-gel dipping process and low post-processing temperatures. The photocatalytic degradation of toxic organic vapors using the prepared films was evaluated using a continuous-flow glass tube under visible light exposure. The surface properties of the S-TiO₂-AS and TiO₂-AS films were examined by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and ultraviolet-visible spectroscopy. The photolysis of benzene, toluene, ethyl benzene, and xylene (BTEX) did not occur on the bare AS. In contrast, the photocatalytic degradation efficiencies of the target pollutants using S-TiO₂-AS were higher than those obtained using reference TiO₂-AS photocatalyst. In particular, the average photocatalytic degradation efficiencies of BTEX using S-TiO₂-0.8-AS (S/Ti ratio=0.8) over a 3-h process were 34%, 78%, 91%, and 94%, respectively, whereas those of TiO₂-AS were 2%, 11%, 21%, and 36%, respectively. The photocatalytic decomposition efficiencies of BTEX under visible irradiation using S-TiO₂-AS increased with increasing S/Ti ratios from 0.2 to 0.8, but decreased when the ratio further increased to 1.6. Thus, S-TiO₂-AS can be prepared using optimal S/Ti ratios. The degradation of BTEX over S-TiO₂-AS depended on the air flow rates and initial concentrations of the target chemical. Overall, under optimal conditions, S-TiO₂-AS can be effectively applied for the purification of toxic organic vapors.

Key words: Sol-gel dipping, Low post temperature, Sulfur-to-titanium ratio, Reference titanium dioxide-aluminum, sheets-AS

Wan-Kuen Jo, Hyun-Jung Kang. Aluminum sheet-based S-doped TiO₂ for photocatalytic decomposition of toxic organic vapors[J]. Chinese Journal of Catalysis, 2014, 35(7): 1189-1195.

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Aluminum sheet-based S-doped TiO₂ for photocatalytic decomposition of toxic organic vapors

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