期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 21, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-019-4476-7
关键词
Photocatalysis; Plasmon effect; Nanomaterials; Bismuth vanadate; Gold nanoparticles; Microwave synthesis
资金
- FAPESP [2016/21070-5, 2016/01020-3, 2017/11395-7, 2017/12688-8]
- CNPq [474056/2013-9]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
We describe the synthesis of bismuth vanadate nanoflowers decorated with Au nanoparticles (Au-BiVO4NF) using conventional oil bath or microwave irradiation as a heating source, where de AuNPs exhibit sizes of 29 +/- 10nm and 50 +/- 11nm. We show how microwaves can be used to replace well-stablished methods in the synthesis of inorganic nanomaterials and drastically reduce both time and energy consumptions. The Au-BiVO4NF obtained under microwave irradiation exhibited the same physical-chemical properties of those prepared through conventional heating; however, time lapse for synthetizing the heterojunction decreased from 4h to only 10min. The heterojunction is a very promising photocatalyst under visible light irradiation since BiVO4 exhibits low band-gap energy and Au nanoparticles can behave as electron sinks and/or as electron sources through plasmon resonance, increasing charge separation of photogenerated electrons and holes. This synergic effect resulted in a heterojunction able to degrade similar to 95% of methylene blue after 6h of UV-visible light irradiation.
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