Green synthesis of protein capped nano-gold particle: An excellent recyclable nano-catalyst for the reduction of nitro-aromatic pollutants at higher concentration

摘要

An eco-friendly green technology has been developed to synthesize, protein capped nano-gold particles (NGPs) utilizing culture filtrate of Fusarium sp. MMT1 strain. The average diameter of NGPs was 30.61 +/- 17 nm. SDS-PAGE analysis revealed the presence of a similar to 60 kDa protein on NGP surface, rendering higher stability. The fungal based biosynthetic nano-catalyst exhibited excellent recyclable catalytic activity for reduction of toxic p-nitro phenol, o-nitrophenol and o-nitroaniline using sodium borohydride (NaBH4). Interestingly, the nano-catalyst was easily recovered and recycled for next reduction reaction confirming its potential efficiency and good stability. The major significance of our study is the achievement of reusable nano-catalyst efficiently reducing nitroaromatics at a concentration hundred times higher compared to existing reports. This NGP may be utilized as a potential "recyclable nano-catalyst" to eliminate nitroaromatic compounds from environmental effluent efficiently, aiming cleaner environment for the sustainability of development. (C) 2016 Published by Elsevier B.V.