Photocatalytic Reaction of SiO₂/TiO₂ Composite Core-Shell Structured Powders

Abstract:

In this study, SiO₂/TiO₂ core-shell powders were prepared by 2 steps of modified sol-gel method. Silica cores were firstly prepared. In this step, polyethylene glycol was introduced in order to control shape and size. At the second step, Zn, N co-doped TiO₂ sols were prepared to coat on SiO₂ cores by dipping method. The synthesized core-shell structured powders were characterized using scanning electron microscopy, electron dispersive X-ray spectrometer, X-ray diffractometer and Fourier-transformed infrared spectrophotometer. Photocatalytic activity was evaluated by means of degradation of methylene blue solution. The effect of polyethylene glycol utilized for controlling size and shape of silica cores was studied together with the effect of calcinations temperature and amount of Zn doping on anatase phase, morphology, and crystallite size and photocatalytic property. Silica cored particles are spherical shape having particle size of 300 nm. TiO₂ coating resulted in a rough and textured surface of the core-shell particles and particle size about 400 nm. It was found that calcination temperature has a significant effect on degree of crystallinity of anatase phase, leading to enhancement of photocatalytic activity.

• Periodical: Advanced Materials Research (Volumes 602-604)
• Pages: 139-143
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.602-604.139
• Online since: December 2012
• Authors: Lek Sikong, Pattamon Masom
• Keywords: Core-Shell Powder, SiO₂/TiO₂, TiO₂ Composite, Zn, N Co-Doped TiO₂

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