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Open AccessArticle

Lignin-Mediated Biosynthesis of ZnO and TiO2 Nanocomposites for Enhanced Antimicrobial Activity

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Department of Chemistry, Prof. Ramkrishna More Arts, Commerce and Science College, Pune, Maharashtra 411044, India
2
Nanocrystalline Laboratory, Centre for Material for Electronic Technology (CMET), Pune, Maharashtra 411008, India
3
Department of Botany, Prof. Ramkrishna More Arts, Commerce and Science College, Pune, Maharashtra 411044, India
4
Department of Biotechnology, Savitribai Phule Pune University, Pune, Maharashtra 411007, India
*
Authors to whom correspondence should be addressed.
J. Compos. Sci. 2019, 3(3), 90; https://doi.org/10.3390/jcs3030090
Received: 30 June 2019 / Revised: 28 August 2019 / Accepted: 9 September 2019 / Published: 13 September 2019
(This article belongs to the Special Issue Nanocomposites for Biomedical Implants and Tissue Engineering)
In this work, we report the synthesis of fragmented lignin (FL) assisted zinc oxide (ZnO) and titanium oxide (TiO2) nanocomposites. The fragmented lignin synthesized from biomass (sugarcane bagasse) was used as a template to generate the morphology and crystallite structure of metal oxide nanomaterial. The nanocomposites were synthesized by a simple precipitation method, wherein fragmented lignin is used in alkaline medium as a template. X-ray diffraction (XRD) analysis shows the phase formation of hexagonal wurtzite ZnO and mixed phase formation of TiO2 as rutile and anatase. The morphology was studied by using field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HRTEM). The FE-SEM of pristine ZnO nanocomposites showed a cluster of particles whereas FL–ZnO NPs showed self-aligned nanoparticles in the form of rod shaped having average size 30–70 nm. Pristine TiO2 nanoparticles showed clusters of particles and FL–TiO2 nanocomposites showed well crystalline 41nm size nanocomposites. The FL acts as a surfactant which restrict the cluster formations. The band gap determined by diffuse reflectance spectra is 3.10 eV and 3.20 eV for FL–ZnO and FL–TiO2 nanocomposites, respectively. Photoluminescence spectra of both nanocomposites showed structural defects in the visible region. Further, the antimicrobial activity of pristine ZnO and TiO2 nanoparticles, and FL–ZnO and FL–TiO2 nanocomposites against Escherichia coli (ATCC25922), Staphylococcus aureus (ATCC25923) were studied under UV-A (315-400 nm) (8W) for 30min. View Full-Text
Keywords: ZnO; TiO2; fragmented lignin; E. coli; S. aureus. Nanorods ZnO; TiO2; fragmented lignin; E. coli; S. aureus. Nanorods
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Samb-Joshi, K.M.; Sethi, Y.A.; Ambalkar, A.A.; Sonawane, H.B.; Rasale, S.P.; Panmand, R.P.; Patil, R.; Kale, B.B.; Chaskar, M.G. Lignin-Mediated Biosynthesis of ZnO and TiO2 Nanocomposites for Enhanced Antimicrobial Activity. J. Compos. Sci. 2019, 3, 90.

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