Synthesis and Characterization of C-TiO2/FeTiO3 and CQD/C-TiO2/FeTiO3 Photocatalysts with Enhanced Photocatalytic Activities Under Sunlight Irradiation
来源期刊：Acta Metallurgica Sinica2016年第1期
论文作者：Ramakrishna Dadigala Bhagavanth Reddy Gangapuram Rajkumar Bandi Ayodhya Dasari Veerabhadram Guttena
文章页码：17 - 27
摘 要：Sunlight-driven C-TiO2/FeTiO3 composites were synthesized with different weight fractions of FeTiO3.The as-prepared samples were characterized by UV-Visible diffuse reflectance spectroscopy,Fourier transform infrared spectroscopy,X-ray diffraction analysis,transmission electron microscopy,scanning electron microscopy,energy-dispersive X-ray spectroscopy,and photoluminescence.Under sunlight irradiation,the C-TiO2/FeTiO3 photocatalysts degraded methyl orange（MO） efficiently and displayed much higher photocatalytic activity than that of pure FeTiO3 or carbon-doped titanium dioxide（C-TiO2）,and the C-TiO2/FeTiO3 photocatalyst with 10 wt%of FeTiO3 exhibited the highest photocatalytic activity.The enhancement of photocatalytic activity was mainly ascribed to the formation of a heterojunction between C-TiO2 and FeTiO3,which facilitated the transfer and separation of photogenerated electron-hole pairs.The quenching effects of different scavengers demonstrated that the reactive superoxide radicals（O2-） and hydroxyl radicals（OH） played a major role in the MO degradation.The possible photocatalytic mechanism is discussed on the basis of the band structures of C-TiO2 and FeTiO3.To further enhance the photocatalytic efficiency,double-heterojunctioned CQD/C-TiO2/FeTiO3 composite was prepared by loading carbon quantum dots onto the C-TiO2/FeTiO3 surface.
Ramakrishna Dadigala，Bhagavanth Reddy Gangapuram，Rajkumar Bandi，Ayodhya Dasari，Veerabhadram Guttena
Department of Chemistry,Osmania University
摘 要：Sunlight-driven C-TiO2/FeTiO3 composites were synthesized with different weight fractions of FeTiO3.The as-prepared samples were characterized by UV-Visible diffuse reflectance spectroscopy,Fourier transform infrared spectroscopy,X-ray diffraction analysis,transmission electron microscopy,scanning electron microscopy,energy-dispersive X-ray spectroscopy,and photoluminescence.Under sunlight irradiation,the C-TiO2/FeTiO3 photocatalysts degraded methyl orange（MO） efficiently and displayed much higher photocatalytic activity than that of pure FeTiO3 or carbon-doped titanium dioxide（C-TiO2）,and the C-TiO2/FeTiO3 photocatalyst with 10 wt%of FeTiO3 exhibited the highest photocatalytic activity.The enhancement of photocatalytic activity was mainly ascribed to the formation of a heterojunction between C-TiO2 and FeTiO3,which facilitated the transfer and separation of photogenerated electron-hole pairs.The quenching effects of different scavengers demonstrated that the reactive superoxide radicals（O2-） and hydroxyl radicals（OH） played a major role in the MO degradation.The possible photocatalytic mechanism is discussed on the basis of the band structures of C-TiO2 and FeTiO3.To further enhance the photocatalytic efficiency,double-heterojunctioned CQD/C-TiO2/FeTiO3 composite was prepared by loading carbon quantum dots onto the C-TiO2/FeTiO3 surface.
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