期刊
OPTICAL MATERIALS
卷 113, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2021.110853
关键词
BaTiO3 particles; Bi2WO6 hierarchical architectures; BaTiO3/Bi2WO6 heterojunctions; Photodegradation; Simulated dye wastewater
资金
- National Natural Science Foundation of China [51662027]
The study investigated the photocatalytic degradation process of mixture dye solutions in different pH environments using novel BaTiO3/Bi2WO6 (BTO/BWO) heterojunction composites. The 15%wt BTO/BWO composite showed the highest photodegradation performance due to efficient separation of photoexcited electron/hole pairs. The photodegradation effect was found to be influenced by acidic-alkaline environments, and a competitive photodegradation phenomenon between the dyes was observed in mixed solutions.
To reveal the photodegradation process of mixture dye solutions in different pH environments by photocatalysts is a key point to promote the practical application of potocatalysis technology in purifying industrial dye wastewater. Herein we report the photocatalytic degradation of various organic dyes (MO, RhB, MB) and MO/RhB/MB mixture solutions in different pH environments by using novel BaTiO3/Bi2WO6 (BTO/BWO) heterojunction composites as the photocatalyst and simulated sunlight as the light source. The BTO/BWO heterojunction photocatalysts were prepared by immobilizing BTO particles onto rose flower-like BWO hierarchical architectures. Among the as-derived samples, the 15 wt%BTO/BWO composite is determined to have the highest photodegradation performance, which is ascribed to the efficient separation of photoexcited electron/hole pairs due to the Z-scheme electron transfer mechanism. The photodegradation of the dyes is found to be highly dependent on the acidic-alkaline environments. Moreover, an interesting competitive photodegradation phenomenon between the dyes is observed in the MO/RhB/MB mixture solutions. Superoxide (center dot O-2(-)) and hydroxyl (center dot OH) radicals are suggested to be the direct reactive species causing the dye photodegradation in the present photocatalytic system.
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