Comprehensive biological assessment and photocatalytic activity of surfactant assisted solvothermal synthesis of ZnO nanogranules

Zare, Mina and Namratha, K. and Thakur, M. S. and Yallappa, S. and Byrappa, K. (2018) Comprehensive biological assessment and photocatalytic activity of surfactant assisted solvothermal synthesis of ZnO nanogranules. Materials Chemistry and Physics, 215. 148 - 156. ISSN 0254-0584

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A facile synthetic route and growth mechanism zinc oxide nanogranules (ZnO NGs) have been developed using tween 80 via solvothermal method. Tween 80 act as both reducing and stabilizing agent, which plays a critical role in the formation of ZnO NGs and enhanced the antimicrobial and antioxidant activity of ZnO NGs. The formation of surfactant stabilized ZnO NGs are confirmed by monitoring UV–Vis absorption spectra for surface plasmon resonance (SPR) band observed at ∼364 nm. Further, the band gap from UV–Vis absorption spectra of NGs shows blue shift which is attributed to decrease in particle size of synthesized ZnO NGs. The powder X-ray diffraction (XRD) pattern of ZnO NGs shows well crystalline nature with hexagonal wurtzite structure. The size and surface morphology of as synthesized ZnO NGs were analysed by transmission electron scanning microscopy (TSEM), which confirms the obtained NGs having uniform spherical shape with the sizes ranging from 15 to 20 nm. FTIR results confirmed ZnO NGs bio-capped with functional group of surfactant molecule (tween 80), which stabilizes the NGs for a long time and enhanced the biological activity. In addition, the in vitro biological activity such as antioxidant, antimicrobial and haemolysis were performed to as obtained ZnO NGs. The in vitro antioxidant properties of the granules was performed by using DPPH assay and found that the antioxidant activity of prepared NGs was enhanced to 90 when compared to control. The antimicrobial activity of as synthesized ZnO NGs against selected food-born pathogen revealed that the tested Gram negative bacteria are more pronounced than the tested Gram positive bacteria. The cytotoxic assessment was carried out by hemolytic test shows there was no toxicity found with treated sample. Moreover, photocatalytic degradation of rhodamine B dye was also carried out for ZnO NGs. This study suggested that tween 80 treated ZnO NGs could be used in many biological applications and food science.

Item Type: Article
Uncontrolled Keywords: ZnO nanogranules, Solvothermal method, TEM, Antioxidant activity, Antimicrobial activity, Haemolysis activity
Subjects: F Earth Science > Geology
Divisions: Department of > Earth Science
Depositing User: Manjula P Library Assistant
Date Deposited: 08 Jul 2019 06:33
Last Modified: 08 Jul 2019 06:33

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