Green synthesis of zinc oxide nanoparticles using leaf extract: characterization, antimicrobial, antioxidant and photocatalytic activity.
Farjana Rahman, Md Abdul Majed Patwary, Md Abu Bakar Siddique, Muhammad Shahriar Bashar, Md Aminul Haque, Beauty Akter, Rimi Rashid, Md Anamul Haque, A K M Royhan Uddin
Author Information
Farjana Rahman: Department of Chemistry, Comilla University, Cumilla 3506, Bangladesh.
Md Abdul Majed Patwary: Department of Chemistry, Comilla University, Cumilla 3506, Bangladesh. ORCID
Md Abu Bakar Siddique: Institute of National Analytical Research and Service (INARS), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka 1205, Bangladesh.
Muhammad Shahriar Bashar: Institute of Fuel Research and Development (IFRD), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka 1205, Bangladesh.
Md Aminul Haque: Department of Chemistry, Jagannath University, Dhaka 1100, Bangladesh.
Beauty Akter: Department of Chemistry, Comilla University, Cumilla 3506, Bangladesh.
Rimi Rashid: Materials Science Division, Atomic Energy Centre, Bangladesh Atomic Energy Commission, Dhaka 1000, Bangladesh.
Md Anamul Haque: Department of Pharmacy, Comilla University, Cumilla 3506, Bangladesh.
A K M Royhan Uddin: Department of Chemistry, Comilla University, Cumilla 3506, Bangladesh.
Zinc oxide nanoparticles (ZnO NPs) have been successfully prepared using leaf extract and their antimicrobial, antioxidant and photocatalytic activity investigated. The structural, compositional and morphological properties of the NPs were recorded and studied systematically to confirm the synthesis. The aqueous suspension of NPs showed an ultraviolet-visible (UV-Vis) absorption maxima of 370 nm, indicating primarily its formation. X-ray diffraction analysis identified the NPs with a hexagonal wurtzite structure and an average particle size of 16.6 nm. Fourier transform infrared analysis identified some biomolecules and functional groups in the leaf extract as responsible for the encapsulation and stabilization of ZnO NPs. Energy-dispersive X-ray analysis showed the desired elemental compositions in the material. A flower-shaped morphology of ZnO NPs was observed by scanning electron microscopy, with a grain size of around 15 nm. The optical properties of the NPs were studied by UV-Vis spectroscopy, and the band gap was calculated as 3.37 eV. The prepared ZnO NPs have demonstrated antimicrobial activity against , with a zone of inhibition of 14 and 10 mm, respectively. The photocatalytic behaviour of ZnO NPs showed absorbance degradation at around 640 nm and it discoloured methylene blue dye after 1 h, with a degradation maximum of 84.29%. Thus, the prepared ZnO NPs could potentially be used in antibiotic development and pharmaceutical industries, and as photocatalysts.
