Abstract
Preparation and development of a novel visible light driven of CoAl2O4 on nano-TiO2 (NTiO2@x-CoAl2O4-H) nanocomposite with the aid of a facile sol-gel-hydrothermal synthesis have been reported for the first time. The as-prepared NTiO2@x-CoAl2O4-H nanocomposite was characterized with the utilization of X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) techniques. The photocatalytic performance of as-synthesized NTiO2@CoAl2O4-H nanocomposite was evaluated for the degradation of methyl orange (MO) under LED visible light irradiation. The enhanced photocatalytic activity of the NTiO2@x-CoAl2O4-H nanocomposite can be ascribed to the lower recombination of photogenerated e–/h+ pairs and its favorable separation. Mott-Schottky plots showed effect of pH and CoAl2O4-H loading on the flat band potential and donor density. The Nyquist plots of the samples showed an efficient separation of the photo-generated electrons and holes and confirmed the existing of low surface resistance in NTiO2@x-CoAl2O4-H nanocomposite. Bode plots showed prolongation in lifetime for nanocomposite compare with TiO2. The charge transfer phenomenon is fastest for this case. Phase angle tails highlighted higher pseudocapacitive nature for nanocomposite compare with TiO2.
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