Biosynthesis of Ag/bentonite, ZnO/bentonite, and Ag/ZnO/bentonite nanocomposites by aqueous leaf extract of <i>Hagenia abyssinica</i> for antibacterial activities-Reference-Cited by-同舟云学术

Biosynthesis of Ag/bentonite, ZnO/bentonite, and Ag/ZnO/bentonite nanocomposites by aqueous leaf extract of Hagenia abyssinica for antibacterial activities

Published:2023-01-01 Issue:1 Volume:62 Page:
ISSN:1605-8127
Container-title:REVIEWS ON ADVANCED MATERIALS SCIENCE
language:en
Short-container-title:

Author:

Zewudie Adisu Girma¹,Zereffa Enyew Amare²,Segne Teshome Abdo²,Murthy H. C. Ananda²³,Ravikumar C. R.⁴,Muniswamy Dhanalakshmi⁵,Binagdie Bayissa Bekele⁶

Affiliation:

1. Department of Chemistry, Madda Walabu University , Robe , Ethiopia

2. Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University , PO Box 1888 , Adama , Ethiopia

3. Department of Prosthodontics, Saveetha Dental College & Hospital, Saveetha Institute of Medical and Technical Science (SIMATS), Saveetha University , Chennai , 600077, Tamil Nadu , India

4. Research Centre, Department of Science, East-West Institute of Technology , Bengaluru , 560091 , India

5. Department of Physics, Government Science College (Nrupathunga University) , Bengaluru , 560 001 , India

6. Adama Public Health Referral and Research Laboratory Center , Adama , Ethiopia

Abstract

Abstract We report the synthesis of Ag/bentonite, ZnO/bentonite and Ag/ZnO/bentonite nanocomposites (NCs) using Hagenia abyssinica plant extract and their antibacterial study. The synthesized NCs were characterized by using many advanced techniques. The X-ray diffraction and high resolution transmission electron microscopy analysis confirmed the formation of composites with different phases. The average crystallite size (D) values of pure Ag nanoparticles (NPs), ZnO NPs, and activated bentonite (Na-AB) were found to be 8.14, 18.1, and 37.6 nm, respectively. The Ag/bentonite NCs, ZnO/bentonite NCs, and Ag/ZnO/bentonite NCs exhibited the D values of 7.4, 9.4, and 9.4 nm, respectively. The Fourier transform infrared spectral analysis revealed the presence of hydroxyl, carbonyl, and other functional groups on the surface of the synthesized NCs. The transmission electron microscopic analysis revealed the formation of Ag and ZnO NPs with hexagonal, rod-shaped, and spherical structures. HRTEM also revealed the presence of (102) plane of ZnO and (220) plane of Ag in Ag/ZnO/bentonite NCs. The antibacterial activities of the composites suspension were evaluated against Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 by the disc diffusion and broth dilution methods. The ternary NC and Ag/ZnO/bentonite exhibited better zone of inhibition of 14.3 ± 0.3 and 17.3 ± 0.2 mm at 10 mg·mL−1 toward E. coli and S. aureus bacterial strains. The minimum inhibitory concentration and minimum bactericidal concentration values of Ag/ZnO/bentonite NCs were found to be 156.25 and 312.5 µg·mL−1 for E. coli. The investigation results revealed that the low temperature bio-synthesized Ag/ZnO/bentonite is a promising bactericide over the binary composites.

Publisher

Walter de Gruyter GmbH

Subject

Condensed Matter Physics,General Materials Science

Link

https://www.degruyter.com/document/doi/10.1515/rams-2022-0307/pdf

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