Enhanced catalytic performance of BiVO4/Pt under the combination of visible-light illumination and ultrasound waves

Publication date: Available online 3 June 2019Source: Journal of the Taiwan Institute of Chemical EngineersAuthor(s): Ying Lu, Haochuan Jing, Hongbin Yu, Yahui Zhao, Ying Li, Mingxin Huo, Suiyi Zhu, John C. CrittendenAbstractIn this paper, the enhanced degradation and improved mineralization of pollutants were successfully achieved by using BiVO4/Pt under the combination of visible light irradiation and ultrasound waves. The as-prepared BiVO4/Pt were studied using various investigative techniques and the results demonstrated that Pt nanoparticles with a diameter of about 3–4 nm were uniformly dispersed on the surface of BiVO4 sheet, and the composite catalysts presented enlarged light absorption. At the optimum experimental conditions, i.e., Pt loading amount was 2.35%, catalyst dosage was 20 mg, RhB initial concentration was 20 mg/l, and the ultrasound power was 210 W, a synergy index of 2.76 was achieved during this sonophotocatalytic system. The result showed that the coupling of photocatalysis with ultrasonic waves was more efficient than the sum of individual procedures for contaminates decomposition, indicating the superiority of sonophotocatalysis as an effective pollutants removal method. From the mechanism analysis, holes were the first species involved in RhB sonophotodegradation. In addition, the reusability of this sonophotocatalysis was also discussed in detail.
Source: Journal of the Taiwan Institute of Chemical Engineers - Category: Chemistry Source Type: research