Adsorption and photocatalytic activity of biosynthesised ZnO nanoparticles using Aloe Vera leaf extract. (25th March 2021)

• Record Type: Journal Article
• Authors: Jose, Lolly Maria; Raj, R S Arun; Sajan, D; Aravind, Arun
• Is Part Of: Nano express. Volume 2:Number 1(2021)
• Publication Date: 2021-03-25
• Subjects: green synthesis -- zinc oxide nanoparticles -- williamson-hall method -- rietveld refinement -- photocatalysis -- adsorption kinetics; Nanotechnology -- Periodicals; Nanoscience -- Periodicals; 620.5
• DOI: 10.1088/2632-959X/abeec6
• Languages: English
• ISSNs: 2632-959X

Abstract

Abstract: In this article, we demonstrates the growth of phase pure ZnO nanostructures from Aloe-Vera leaf extract and degradation of an organic dye-Malachite Green (MG)- from aqueous medium using the same as catalyst. Adsorption mechanisms were evaluated using Lagergren's pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. X-Ray diffraction data showed that the synthesised ZnO is crystalline with hexagonal wurtzite phase. Average crystallite size and lattice strain was estimated from Scherrer equation and Williamson-Hall analysis with the help of Rietveld refinement data. Crystallite size obtained from Scherrer method is 12.62 nm while that from Williamson-Hall analysis is 19.27 nm. Uniform growth of ZnO nano-sheets were confirmed by FE-SEM analysis. Optical characterisation was carried by UV-Visible spectroscopy and the band gap ZnO nanoparticles was found to be 3.19 eV. Zn-O stretching vibrations were recorded at 550 cm −1 using FTIR spectrophotometer. Results showed that biosynthesised ZnO nanosheets are particularly effective for the degradation of MG dye.