Production of Biogenic Nanoparticles for the Reduction of 4-Nitrophenol and Oxidative Laccase-Like Reactions

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.

Microbially Induced Mineralization of Layered Mn Oxides Electroactive in Li Batteries

“…With the aim of bypassing this technological barrier, biomineralization, bio-assisted, or bio-inspired processes can be used as eco-efficient methods for fabricating Li-ion electrodes. Microbial biomineralization proceeding under soft conditions, i.e., at ambient temperature and in aqueous media, provides nanoparticles with specific properties (crystallinity, texture, catalytic activity, and electroactivity) usually difficult to reach through abiotic pathways ( Kim et al, 2018 ; Piacenza et al, 2018 ; Capeness et al, 2019 ; Gallardo-Benavente et al, 2019 ; Gomez-Bolivar et al, 2019 ). This has been reported for the microbial-assisted Li-ion electrode synthesis of Fe phosphates ( Mirvaux et al, 2016 ), Fe-oxides ( Miot et al, 2014 ), Co 3 O 4 ( Shim et al, 2011 ; Rosant et al, 2012 ), MnO x /C ( Li et al, 2016 ), or MnO 2 ( Yu et al, 2013 ).…”

Shotgun proteomic analysis of nanoparticle-synthesizing Desulfovibrio alaskensis in response to platinum and palladium

“…It is possible that mutations to the Dde_2137 protein could produce smaller, more highly catalytic Pt nanoparticles, which would be more useful for applications rather than recovery. A recent study has also shown that D. alaskensis has the ability to produce bi-metallic nanoparticles made of both palladium and platinum and illustrates how they are useful for redox reactions applicable to industrial settings [ 16 ]. This further underpins there being a shared pathway for the formation of both the palladium and platinum nanoparticles, which potentially are effluxed using the same machinery (Dde_3627 and Dde_1415), as highlighted in this work.…”

“…are ideally suited for further analysis as they are already highly tolerant to platinum and palladium ions, and can survive up to 2 and 5 mM, respectively [15]. They reduce these metals at incredible speed, with up to 100 % of Pd 2+ being converted to Pd(0) within 5 min [7], and also are able to synthesize bi-metallic nanoparticles containing both elemental palladium and platinum [16].…”

Microbiologically-Synthesized Nanoparticles and Their Role in Silencing the Biofilm Signaling Cascade

“…Moreover, the presence of a biological capping agent on some micro biogenic nanoparticles, as a protective covering against oxidation, agglomeration, and aggregation, offer a higher stability (Durán and Seabra, 2012). Hence, microbiologically-synthesized NPs are often considered to be a better option for antibacterial therapies (Capeness et al, 2019).…”