Fast One-Pot Photosynthesis of Plasmonic Protein-Coated Silver/Silver Bromide Nanoparticles with Efficient Photocatalytic Performance
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Photocatalysis is a promising method with great potential to solve several environmental challenges. Plasmonic Ag/AgBr nanoparticles (Ag/AgBr-NPs) are stable and highly efficient photocatalysts under visible light. Here, we reported for the first time the fast one-pot photosynthesis of stable protein-coated Ag/AgBr-NPs under blue light illumination. The photosynthesis was a simple process, carried out by equimolar mixing of Ag+ and Br− in the presence of protein, compatible with the green chemistry procedure. Electron microscopy showed that the Ag/AgBr-NPs were slightly heterogeneous in size and shape, and enveloped by a protein matrix responsible for colloidal stability. X-ray diffraction analysis showed that the Ag/AgBr-NPs were purely crystalline in nature. The content of metallic Ag0 in the Ag/AgBr-NPs was easily controlled varying the ratio between Ag+ and Br− in the reaction. Plasmonic protein-coated Ag/AgBr-NPs showed photocatalytic activity for the degradation of methylene blue, which enhanced with the increase of metallic Ag0 content, attributed to the synergistic effects among the plasmonic band, photosensibility of semiconductor and decrease in the recombination rate of the electron–hole pairs by the protein layer.
KeywordsProtein/Ag/AgBr nanoparticles Green chemistry Organic molecules Protein-coated Photocatalysis
This study was funded by Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP) via grants number 2015/02897-3, 2015/17688-0, 2017/17275-3, 2017/16976-8, and also by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) via grant number 402289/2013-7. The authors are grateful to the Multiuser Central Facilities (UFABC) for the experimental support.
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Conflict of interest
The authors declare that they have no competing interests.
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