One-pot preparation of pomegranate-like polydopamine stabilized small gold nanoparticles with superior stability for recyclable nanocatalysts. Issue 47 (25th April 2016)

• Record Type: Journal Article
• Authors: Ni, Yunzhou; Tong, Gangsheng; Wang, Jie; Li, Huimei; Chen, Feng; Yu, Chunyang; Zhou, Yongfeng
• Is Part Of: RSC advances. Volume 6:Issue 47(2016)
• Page Start: 40698
• Page End: 40705
• Publication Date: 2016-04-25
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra05902c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A pre-mixing and post-polymerization strategy has been developed to fabricate polydopamine (PDA) stabilized small gold nanoparticles (size of AuNPs < 5 nm) with high stability for recyclable catalysis of 50 mM 4-nitrophenol with a TOF of 1006 h −1 . Abstract : A pre-mixing and post-polymerization strategy has been developed for one-pot preparation of pomegranate-like polydopamine (PDA) stabilized small gold nanoparticles (AuNPs) with sizes smaller than 5 nm in aqueous media. Firstly, the pre-mixing of dopamine (DA) and HAuCl4 was used to generate the Au clusters as nucleating seeds. Secondly, the rapid self-polymerization of DA into polydopamine (PDA) and simultaneous Au redox reaction were initiated when the pH of the reaction system was tuned to 8 by the injection of a NaOH solution into the mixture, leading to the formation of the pomegranate-like PDA–AuNPs nanocomposites with small AuNPs well dispersed inside. The as-prepared nanocomposites exhibited superior stability in high saline conditions (500 mM NaCl) and were able to be coated onto a filter paper to form paper catalysts, which were used as recyclable catalysts for the reduction of high concentrated (50 mM) 4-nitrophenol (4-NP) with a TOF of 1006 h −1 .