Biosynthesis of gold nanoparticles by Aspergillum sp. WL-Au for degradation of aromatic pollutants |
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| Institution: | 1. State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;1. Department of Medical Sciences, Shahrood Branch, Islamic Azad University, Shahrood, Iran;2. Department of Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran;3. Department of Biology, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran;1. Department of Biotechnology, University of Malakand Chakdara Dir Lower, Pakistan;2. Department of Biotechnology, Faculty of Chemical and Life Sciences, Abdul Wali Khan University Mardan (AWKUM), Mardan 23390, Pakistan;3. Department of Botany, PMAS Arid Agriculture University, Rawalpindi, Pakistan;4. Institute of Integrative Biosciences, CECOS University, Peshawar 25000, Pakistan |
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| Abstract: | 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 6.3×10?3 s?1, 5.5×10?3 s?1, 10.6×10?3 s?1, 8.4×10?3 s?1 and 13.8×10?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. |
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| Keywords: | Gold nanoparticles Biosynthesis Catalytic activity Aromatic pollutants |
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