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论文类型：期刊论文

发表时间：2017-04-01

发表刊物：PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES

收录刊物：SCIE、EI

卷号：88

页面范围：133-141

ISSN号：1386-9477

关键字：Gold nanoparticles; Biosynthesis; Aspergillum; Catalytic activity; Aromatic pollutants

摘要：A simple method for synthesis of gold nanoparticles (AuNPs) using Aspergillum sp. WL-Au was presented in this study. According to UV-vis spectra and transmission electron microscopy images, the shape and size of AuNPs were affected by different parameters, including buffer solution, pH, biomass and HAuCl4 concentrations. Phosphate sodium buffer was more suitable for extracellular synthesis of AuNPs, and the optimal conditions for AuNPs synthesis were pH 7.0, biomass 100 mg/mL and HAuCl4 3 mM, leading to the production of spherical and pseudo-spherical nanoparticles. The biosynthesized AuNPs possessed excellent catalytic activities for the reduction of 2-nitrophenol, 3-nitrophenol, 4-nitrophenol, o-nitroaniline and m-nitroaniline in the presence of NaBH4, and the catalytic rate constants were calculated to be 6.3x10(-3)s(-1) , 5.5x10(-3)s(-1) , 10.6x10(-3)s(-1), 8.4x10(-3)s(-1) and 13.8x10(-3)s(-1), respectively. The AuNPs were also able to catalyze the decolorization of various azo dyes (e.g. Cationic Red X-GRL, Acid Orange II and Acid scarlet GR) using NaBH4 as the reductant, and the decolorization rates reached 91.0-96.4% within 7 min. The present study should provide a potential candidate for green synthesis of AuNPs, which could serve as efficient catalysts for aromatic pollutants degradation.