Abstract
Biogenic nanoparticles present a wide range of possibilities for use in industrial applications, their production is greener, they can be manufactured using impure feedstocks, and often have different catalytic abilities compared to their chemically made analogs. Nanoparticles of Ag, Pd, Pt, and the bi-elemental PdPt were produced by Morganella psychrotolerans and Desulfovibrio alaskensis and were shown to be able to reduce 4-nitrophenol, an industrial and toxic pollutant. Nanoparticles were recovered post-reaction and then reused, thus demonstrating continued activity. Biogenic PdNPs were shown to have enhanced specificity in a wide pH activity range in the oxidation of the three common substrates used 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), 2,6-Dimethoxyphenol and (2,6-DMP) and 3,3′,5,5′-Tetramethylbenzidine (TMB) to determine oxidase-like activity. Overall Pd in a nanoparticle form exhibited higher oxidation activity than its ionic counterpart, highlighting the potential of biogenic nanoparticles over the use of ions or chemically made elemental forms.
Highlights
Nanoparticles (NPs), are particles with a dimension between 1 and 100 nm, which may exhibit different physicochemical properties compared to their bulk-metal equivalent due to their larger surface area to mass ratio
The aim of the present work was to investigate the properties of AgNPs synthesized by M. psychrotolerans, and Pd, Pt, and bimetallic PdPt NPs synthesized by D. alaskensis G20 as catalysts for reducing and oxidizing reactions
Unlike the NPs produced by D. alaskensis, AgNPs are produced extracellularly by M. psychrotolerans and were free within the culture medium (Figure 1D)
Summary
Nanoparticles (NPs), are particles with a dimension between 1 and 100 nm, which may exhibit different physicochemical properties compared to their bulk-metal equivalent due to their larger surface area to mass ratio. The chemical methods of production of nanoparticles often involves high temperatures, pressures and hazardous chemicals as well as requiring high purity feed stocks (Yu et al, 2009). As such biogenic nanoparticles represent an alternative that has the potential to be greener and a more cost-effective method for the synthesis of nanoparticles (Kharissova et al, 2013)
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