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Enhancement of Photocatalytic Activity of TiO2 Thin Film Using Diethanolamine and MCM-41

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Abstract:

TiO2 thin film enhanced by diethanolamine (DEA) and MCM-41 (D-TiO2/MCM-41) was successfully synthesized by sol-gel dip coating technique on glass slides. The roles of DEA and MCM-41 on physical and photocatalytic characteristics of the films were studied using various techniques such as x-ray defraction (XRD), fourier transform infrared spectroscopy (FTIR), ultra violet-visible (UV-Vis) spectrometry, Brunauer, Emmett and Teller (BET) surface area analysis and field emission scanning electron microscope (FESEM). The XRD results showed that the thin film contained almost 100% anatase phase and the crystal size of TiO2 was in the range of 4-8 nm. The FTIR spectra indicated the formation of Ti-O-Si and Si-O-Si linkages due to interaction of TiO2 and MCM-41. The surface area of TiO2 was increased significantly when MCM-41 was added. The use DEA and MCM-41 caused slight increase in visible light absorption but UV absorption was decreased. The photocatalytic reactivity of the thin film was tested by photocatalytic degradation of methylene blue under visible light. The addition of DEA as a nitrogen source was beneficial not only for obtaining stable/smooth surface of the thin film but also for enhancing photocatalysis of methylene blue by preventing charge carrier recombination. While MCM-41 played important functions in improving porosity and hydrophilicity of the film. The photodegradation of methylene blue was obtained up to 35% of its original concentration when 1M DEA and 0.3M MCM-41 were incorporated in TiO2 thin film. The overall enhancement of photocatalytic activity of the film was a result of nitrogen doping, increased surface area as well as increased hydrophilicity provided by MCM-41.

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Periodical:

Materials Science Forum (Volume 712)

Pages:

117-131

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.712.117

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Online since:

February 2012

Authors:

Ananta Kumar Karki, Nurak Grisdanurak, Siriluk Chiarakorn

Keywords:

MCM-41, Nitrogen Doped TiO2, Photocatalysis, Thin Film

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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