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Bio-mediated synthesis of TiO2 nanoparticles and its photocatalytic effect on aquatic biofilm

Paper ID Volume ID Publish Year Pages File Format Full-Text
30512 44483 2012 7 PDF Available
Title
Bio-mediated synthesis of TiO2 nanoparticles and its photocatalytic effect on aquatic biofilm
Abstract

The nano-TiO2 was synthesized biologically employing Bacillus subtilis (FJ460362). These nanoparticles were characterized by FTIR, TGA–DTA, UV–Visible spectroscopy, XRD and TEM. FTIR and TGA results confirm that the organic impurities were completely removed while calcinating the resultant products. Band gap value was estimated from the UV–Visible spectrum and anatase crystal phase was confirmed by XRD. TEM images reveal that these particles were agglomerated; mostly spherical in shape with an average particle size of 10–30 nm. The synthesized nano-TiO2 particles were coated on glass slides, biofilm were grown and subjected to irradiation of polychromatic light to understand photocatalytic activity in controlling the aquatic biofilm. The bacterial killing process was established by Epi-fluorescence microscopy. The results reveal that biogenic TiO2 nanomaterial acts as good photocatalyst by the generation of H2O2 in the vicinity of the TiO2-biofilm interfaces to suppress the growth of the aquatic biofilm.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Nanoparticles of TiO2 were synthesized through biological routes using Bacillus subtilis. ► XRD and TEM results confirmed the anatase phase formation of TiO2 with an average particle size of 10–30 nm. ► Production of H2O2 at TiO2/pond water and TiO2 coating/biofilm interfaces were estimated under illumination of light. ► The bacticidal efficiency is confirmed from EPM and total bacterial count within the film.

Keywords
Bacterial synthesis; TiO2 nanoparticles; Aquatic biofilm; Hydrogen peroxide; Photocatalytic effect
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 110, 2 May 2012, Pages 43–49
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us