Effect of pH Value on the Bandgap Energy and Particles Size for Biosynthesis of ZnO Nanoparticles: Efficiency for Photocatalytic Adsorption of Methyl Orange

Bachir Gherbi, Salah Eddine Laouini, Souhaila Meneceur, Abderrhmane Bouafia (), Hadia Hemmami, Mohammed Laid Tedjani, Gobika Thiripuranathar, Ahmed Barhoum and Farid Menaa ()
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Bachir Gherbi: Department of Process Engineering, Faculty of Technology, University of El Oued, El-Oued 39000, Algeria
Salah Eddine Laouini: Department of Process Engineering, Faculty of Technology, University of El Oued, El-Oued 39000, Algeria
Souhaila Meneceur: Department of Process Engineering, Faculty of Technology, University of El Oued, El-Oued 39000, Algeria
Abderrhmane Bouafia: Department of Process Engineering, Faculty of Technology, University of El Oued, El-Oued 39000, Algeria
Hadia Hemmami: Department of Process Engineering, Faculty of Technology, University of El Oued, El-Oued 39000, Algeria
Mohammed Laid Tedjani: Department of Process Engineering, Faculty of Technology, University of El Oued, El-Oued 39000, Algeria
Gobika Thiripuranathar: Institute of Chemistry Ceylon, College of Chemical Sciences, Welikada, Rajagiriya 10107, Sri Lanka
Ahmed Barhoum: NanoStruc Research Group, Chemistry Department, Faculty of Science, Helwan University, Helwan 11795, Egypt
Farid Menaa: Department of Nanomedicine and Advanced Technologies, CIC-Fluorotronics, Inc., San Diego, CA 92037, USA

Sustainability, 2022, vol. 14, issue 18, 1-14

Abstract: In this paper, ZnO nanoparticles (NPs) were greenly synthesized at different pH values of 4, 6, 9.5, and 11 via Portulaca oleracea leaf extract, and the effect of pH on the optical and structural properties was studied. UV-Vis spectrophotometers and FTIR spectroscopy characterized the optical properties. Meanwhile, the structural properties were characterized via Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). Furthermore, their photocatalytic dye degradation was examined against methyl orange dye. The characterization results have confirmed the successful biosynthesis of ZnO nanoparticles with a size ranging between 22.17 to 27.38 nm. The synthesis pH value significantly influenced ZnO NPs’ optical and morphological properties. The results have also indicated the high performance of the greenly synthesized ZnO NPs for dye degradation.

Keywords: green synthesis; Portulaca oleracea; zinc oxide; metallic nanoparticles; photocatalysis; methyl orange; sustainability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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