6TH International Congress on Technology - Engineering - Kuala Lumpur3 - Malaysia (2018-07-19)

Design Of Ternary Hybrid Ato/g-c3n4/tio2 Nanocomposite For Visible-light-driven Photocatalysis

Semiconductor-based materials heterogeneous photocatalysis is the result of the interaction between the photogenerated electron–hole pairs after band-gap excitation of the semiconductor particles, followed by the redox reaction with species present in the water–semiconductor interface. Wide band gap TiO2 has most unique band position, electron mobility, chemical stability, and nontoxicity and is used widely in photocatalysis. However, practical application of TiO2 is limited only to UV light due to its wide band gap (1). A notable strategy to lower the band gap is coupling the narrow band-gap semiconductors with TiO2. In this research we combined graphitic carbon nitride (2) and antimony doped tin oxide (3) with TiO2 to construct a new visible light photocatalyst. Antimony-doped tin oxide (ATO) nanoparticles with an average size of ~8 nm were prepared by co-precipitation and subsequent heat-treatment. A series of ATO/g-CN/TiO2 composites with various ATO contents were successfully prepared by combining ATO, g-CN and TiO2 in one pot hydrothermal reaction. The composites were characterized using N2 adsorption/desorption (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the highest photocatalytic performance is obtained with the incorporation of ATO and g-CN nanoparticles with TiO2. BET surface area, PL spectra, and CV measurements were presented to further study the mechanism of the photoactivity. The superior performance of the ATO/g-CN/TiO2 nanocomposite photocatalyst may be attributed to the high surface area, higher carrier transfer rate and lower recombination rate.
Devi Prashad Ojha, Hem Prakash Karki, Jun-Hee Song, Han Joo Kim