Titania-Phosphotungstic Acid Nanocomposites Dispersed Homogeneously in Mesopores as the Recyclable Photocatalyst

Abstract:

Heterogeneous photocatalytic materials, titania–phosphotungstic acid nanocomposites in the mesopores of SBA-15 (TiO2-H4PW12O40/SBA15) were prepared by sol–gel method. Compositions and structures of the nanocomposites were characterized by X-ray diffraction (XRD), UV-visible absorption spectroscopy and transmission electron microscopy (TEM). Uniform mesoporous SBA15 consisting of long-range channels provides the immobilization of titania-phosphotungstic acid nanocomposites. The photocatalytic activity of the prepared TiO2-H4PW12O40/SBA15 powders was evaluated from an analysis of the photocatalytic degradation of methyl orange. The results indicated that photocatalytic activity increased with the amount of H4PW12O40 from 0% to 10% and decreased when the amount of H4PW12O40 was above 10%. It is due to the synergetic reaction of H4PW12O40 and TiO2. However, much more H4PW12O40 can occupy the active center of TiO2. TiO2 can inhibit the decomposition of H4PW12O40 in the TiO2-H4PW12O40/SBA15 composites. On the other hand, H4PW12O40 repressed the TiO2 particle growth during calcination process. The composite catalyst also had the advantage of easily being recovered and reused.

• Periodical: Advanced Materials Research (Volumes 152-153)
• Pages: 202-207
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.152-153.202
• Online since: October 2010
• Authors: Hua Lan Zhou, Sha Wu, Zhong Zou, Qin Qin, Wen Jian Shi
• Keywords: Nanomaterial, Photocatalytic, Sol-Gel Process, TiO₂

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