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Enhanced Mineralization of Gaseous Organic Pollutant by Photo-Oxidation Using Au-Doped TiO2/MCM-41

Author:
Tangale, Nilesh P., Belhekar, Anuja A., Kale, Kishor B., Awate, Shobhana V.
Source:
Water, air, and soil pollution 2014 v.225 no.2 pp. 1847
ISSN:
0049-6979
Subject:
Fourier transform infrared spectroscopy, absorption, acetone, adsorption, air, catalysts, desorption, gold, mineralization, nitrogen, reflectance, surface area, temperature, volatile organic compounds
Abstract:
The synthesis, characterization, and photocatalytic evaluation of titania-loaded MCM-41 with and without Au doping are reported in the present study. The samples were characterized by powder XRD, TEM, low temperature N₂adsorption/desorption, UV–Vis, and FTIR. UV-induced vapor-phase photo-oxidation of acetone was used as a probe reaction to study the role of Au in mineralization of volatile organic compounds (VOCs), viz. acetone at different concentrations. The doping of Au in titania-loaded MCM-41 resulted in the decrease of BET surface area, total pore volume, and average pore size. UV–Vis diffuse reflectance spectra of Au-doped titania-loaded MCM-41 showed the red shift in their absorption bands compared to titania-loaded MCM-41. The activity of mineralization of acetone by photocatalysis for 2 % Au-doped titania-loaded MCM-41 was found to be ∼1.6 times higher than titania-loaded MCM-41. The presence of cocatalytic nanosized gold might be responsible for their enhanced activity on account of the delayed recombination of electron/hole pair. Although, almost complete mineralization of acetone was observed irrespective of the initial concentration of acetone in air (up to 3.72 mol%) by all the catalysts, 2 wt.% Au-doped titania-loaded MCM-41 has shown the most enhanced activity.
Agid:
622657