Use of titanium dioxide nanoparticles biosynthesized by

Abstract

BackgroundOne of the major challenges of nanotechnology during the last decade has been the development of new procedures to synthesize nanoparticles. In this context, biosynthetic methods have taken hold since they are simple, safe and eco-friendly.ResultsIn this study, we report the biosynthesis of TiO2 nanoparticles by an environmental isolate of Bacillus mycoides, a poorly described Gram-positive bacterium able to form colonies with novel morphologies. This isolate was able to produce TiO2 nanoparticles at 37°C in the presence of titanyl hydroxide. Biosynthesized nanoparticles have anatase polymorphic structure, spherical morphology, polydisperse size (40–60 nm) and an organic shell as determined by UV–vis spectroscopy, TEM, DLS and FTIR, respectively. Also, conversely to chemically produced nanoparticles, biosynthesized TiO2 do not display phototoxicity. In order to design less expensive and greener solar cells, biosynthesized nanoparticles were evaluated in Quantum Dot Sensitized Solar Cells (QDSSCs) and compared with chemically produced TiO2 nanoparticles. Solar cell parameters such as short circuit current density (ISC) and open circuit voltage (VOC) revealed that biosynthesized TiO2 nanoparticles can mobilize electrons in QDSSCs similarly than chemically produced TiO2.ConclusionsOur results indicate that bacterial extracellular production of TiO2 nanoparticles at low temperatures represents a novel alternative for the construction of green solar cells.

Biosynthesis of TiO2 and ZnO nanoparticles by Halomonas elongata IBRC-M 10214 in different conditions of medium

“…Bacillus subtilis and Bacillus mycoides respectively show average diameter size in the range of 10-30 nm (spherical shape) and 40-60 nm (spherical shape) at room temperature condition. 41 , 42 Further, the green synthesis of ZnO NPs by Aeromonas hydrophila bacterium had NPs diameter in the range of 57-75 nm with a spherical shape. 43 …”

Cost-effective and eco-friendly synthesis of titanium dioxide (TiO2) nanoparticles using fruit’s peel agro-waste extracts: characterization,in vitroantibacterial, antioxidant activities

“…The UV absorption spectrum for TiO 2 NPs synthesized from Plum (A), Kiwi (B) and Peach (C) were identified at 202.89, 202.92 and 202.48 nm (Figure 4), respectively. The appearance of UV spectrum of numerous titanium dioxide nanoparticles was also evaluated at around 200 nm by many reported works (40,41).…”

Phosphate Favors the Biosynthesis of CdS Quantum Dots in Acidithiobacillus thiooxidans ATCC 19703 by Improving Metal Uptake and Tolerance

“…The use of microorganisms to biosynthesize QDs is of great interest because the nanoparticles produced in this way offer many advantages compared to chemical methods in terms of stability, water solubility, sustainable production and costs. The capacity to produce nanoparticles has been reported in distantly related bacteria such as Escherichia coli, Bacillus mycoides , and Rhodopseudomonas capsulatus (He et al, 2007 ; Iravani, 2014 ; Ordenes-Aenishanslins et al, 2014 ; Jacob et al, 2016 ). Biosynthesis of QDs has also been observed in bacterial cells with high metal resistance, increased tolerance to oxidative stress or overexpressing genes involved in thiol metabolism (Narayanan and Sakthivel, 2010 ; Valizadeh et al, 2012 ; Dunleavy et al, 2016 ; Ulloa et al, 2016 ).…”