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- Title
Investigations on the Phase Transformation, Optical Characteristics, and Photocatalytic Activity of Synthesized Heterostructured Nanoporous Bi<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub>.
- Authors
Sud, Dhiraj; Syal, Abhinandan
- Abstract
Fine-powdered, heterostructured, nanoporous Bi2O3-TiO2 ( BTO) was synthesized by a green approach using ultrasonication, with the mole ratio Bi/Ti of 1:1 and calcined at different temperatures. The physical and optical properties of the mixed oxides were investigated. The phase structure, as identified by X-ray diffraction ( XRD), showed the appearance of new phases as a function of the calcination temperature. Morphological examinations indicated the formation of a nanoporous structure with a drastic change in morphology at the calcination temperature of 850°C from a globule to a rod-shaped structure, which further got transformed to a rocky appearance at 1200°C. Doping with Bi2O3 led to the lowering of the bandgap of TiO2 from 3.25 to 2.5 eV. A BTO nanocatalyst calcined at 450°C exhibited promising photocatalytic activity for the degradation of quinalphos ( QP) (92%) after a time interval of 100 min under visible light and at the optimum pH 8. The kinetics of degradation of QP showed that it follows a pseudo-first-order path with a rate constant 0.01267 min−1. The synthesized BTO mixed oxide showed profound improvement in photocatalytic activity in the visible region as compared to TiO2.
- Subjects
BISMUTH titanate; OPTICAL properties; PHASE transitions; PHOTOCATALYSIS; HETEROGENEOUS catalysis; CALCINATION (Heat treatment); TEMPERATURE measurements; CHEMICAL decomposition; QUINALPHOS
- Publication
Journal of the Chinese Chemical Society, 2016, Vol 63, Issue 9, p776
- ISSN
0009-4536
- Publication type
Article
- DOI
10.1002/jccs.201600099