Preparation and Photocatalytic Activity of TiO₂/Tourmaline Composite Catalyst

Abstract:

TiO₂/tourmaline composite photocatalyst was prepared by sol-gel method using tetrabutyl orthotitanate (Ti (OC₄H₉)₄) as a precursor. As a comparison, pure TiO₂ was prepared at the same experimental conditons without the addition of tourmaline. The obtained composite photocatalyst was characterized by X-Ray diffraction (XRD) and scanning electron microscope (SEM) and its photocatalytic activity was also investigated through the photodiscoloration of methyl orange (MO) under UV irradiation. The XRD results indicated that, in the composite photocatalyst, TiO₂ existed in the form of anatase and rutile, with the sintering temperature and tourmaline content increasing, the anatase phase trended to the transformation to rutile phase. The SEM results revealed that the nanosized particles of TiO₂ were well dispersed and immobilized on the surface of tourmaline, especially for the sample with 2% tourmaline content. Compared with pure TiO₂, the composite photocatalyst exhibited a higher photocatalytic activity. When the pure TiO₂ was used as the photocatalyst, the MO discoloration ratio only reached 55%. However, the MO discoloration ratio could approach 100% in presence of TiO₂/tourmaline composit photocatalyst under the same conditions. The effects of tourmaline content and sintering temperature on the photocatalytic activity of the composite were studied in this work and the results suggested that the sample with 2% tourmaline content and sintered at the temperature of 550°C exhibited the best photocatalytic activity. Finally, the possible mechanism for the photodiscoloration of MO was put forward.

• Periodical: Advanced Materials Research (Volume 800)
• Pages: 464-470
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.800.464
• Online since: September 2013
• Authors: Wei Chao Liu, Huan Yan Xu, Tian Nuo Shi, Li Cheng Wu, Ping Li
• Keywords: Composite Photocatalyst, Sol-Gel, TiO₂, Tourmaline

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