Facile Preparation of TiO 2 -SnO 2 Catalysts using TiO 2 as an Auxiliary for Gas Sensing and Advanced Oxidation Processe
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Facile Preparation of TiO2-SnO2 Catalysts using TiO2 as an Auxiliary for Gas Sensing and Advanced Oxidation Processes Ritu Malik1, Vijay K. Tomer2, Surender Duhan2, Pawan S. Rana1 and S. P. Nehra3 1 Department of Physics 2 Department of Materials Science and Nanotechnology 3 Center of Excellence for Energy and Environmental Studies D. C. R. University of Science and Technology, Murthal, Sonipat-131039, Haryana, India ABSTRACT A facile technique was adopted to synthesize beautiful lilac bush resembling TiO2-SnO2 microflowers aggregates for photodegradation of Congo Red (CR). The TiO2-SnO2 microflowers in the 2-3 μm range with high surface area (80 m2/g), under optimized conditions of catalyst dosage (0.3 g/L), dye concentration (100 ppm) and pH value is 10, exhibit excellent photocatalytic activity under visible light, whereby, 98.3% of the CR aqueous solution was degraded in 40 min of illumination time and also shows good recyclable photocatalytic activities. Further, the gas sensing properties of the as-synthesized material were evaluated towards detection of a variety of volatile organic compounds, such as acetone, methanol, benzene, ammonia, toluene, diethyl ether, and ethanol. INTRODUCTION In recent years, SnO2 have been extensively employed in the photocatalytic decontamination treatment of stained water and air purification [1,2]. To enhance the photocatalytic activity and sensing performance of the SnO2 catalysts it is significant to decrease the recombination of photogenerated hole and electron [3]. The coupling of SnO2 with other semiconducting metal oxide may provide effective approach to explore this problem. The main aim lies in modulating the band gap of SnO2 and increasing the recombination period of photoinduced charge carriers, which leads to the enhanced photodegradation and sensing performance [4-6]. Many materials have been successfully prepared till now and illustrated enhanced photodegradation and sensing performance [7-10]. However, complicated preparation process for the superior photocatalytic and sensing performance of these materials require. In past decades, the growth of nanostructured materials has boosted the photocatalytic and sensing researches into a new era. Many reports indicate that morphology of materials can effectively improve the photocatalytic and sensing performance. A number of morphology of materials has been successfully synthesized, such as such as nanorods, nanosheets, nanoflowers, nanotubes and core shell and so on [1,2,5]. In this paper, 3D microflowers of SnO2 coupled with TiO2 nanoparticles were prepared by using a simple one-pot hydrothermal method. Mixing of these two semiconductors could lead to accumulation of electrons in the conduction band of SnO2 and photogenerated holes in the valence band of the TiO2. As a result, the heterojunction hinders the charge recombination process and improves the photocatalytic performance, thereby shifting the photoexcitation of the coupled nanostructure towards visible light and increase the oxidizing power of SnO2. Also TiO2-S
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