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Loading of Au/Ag bimetallic nanoparticles within electrospun PVA/PEI nanofibers for catalytic applications

Author:
Dengmai Hu  Yunchao Xiao  Hui Liu  Hong Wang  Jingchao Li  Benqing Zhou  Pengchao Liu  Mingwu Shen  Xiangyang Shi  


Journal:
Colloids and Surfaces A: Physicochemical and Engineering Aspects


Issue Date:
2018


Abstract(summary):

Graphical abstract Abstract We present a convenient method to immobilize Au/Ag nanoparticles (NPs) within electrospun polyvinyl alcohol (PVA)/polyethylenimine (PEI) nanofibers by in-situ reduction for catalytic applications. Water-stable electrospun PVA/PEI nanofibers were initially fabricated by crosslinking with glutaraldehyde (GA) vapor. Then, the nanofibers were used as a nanoreactor to bind Au salt via electrostatic interaction with the free PEI amines, followed by NaBH 4 reduction to form Au NPs. The formed Au NP-containing nanofibers were then used to bind Ag + ions via chelation with the free PEI amines, followed by reduction with ascorbic acid to form the Au/Ag NP-loaded PVA/PEI nanofibers. The small size (4.9 ± 1.8 nm) and narrow size distribution of the immobilized Au/Ag NPs reveal that the nanofibrous structure is able to efficiently prevent the aggregation of the NPs. We then evaluated the catalytic activity and reusability of Au/Ag NP-immobilized PVA/PEI nanofiers by catalytic transformation of 4-nitrophenol to 4-aminophenol in aqueous solution. The material exhibited excellent catalytic efficiency and reusability. The developed approach could be applied to create other bimetallic NP-incorporated nanofibers for catalysis, tissue engineering, and environmental remediation applications.


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