Biosynthesis Microwave-Assisted of Zinc Oxide Nanoparticles with Ziziphus jujuba Leaves Extract: Characterization and Photocatalytic Application

Mohamed Abdel Salam,Iqbal Ismail,Stefano Bellucci,Maymounah N Alharthi,Nezar H Khdary

doi:10.3390/nano11071682

Abstract

The present work is intended to biosynthesize zinc oxide nanoparticles (ZnO NPs) via facile and modern route using aqueous Ziziphus jujuba leaves extract assisted by microwave and explore their photocatalytic degradation of methyl orange anionic dye and methylene blue cationic dye under solar irradiation. The biosynthesized microwave assisted ZnO NPs were characterized and the results showed that ZnO NPs contain hexagonal wurtzite and characterized with a well-defined spherical-like shape with an outstanding band gap (2.70 eV), average particle size of 25 nm and specific surface area of 11.4 m2/g. The photocatalytic degradation of the MO and MB dyes by biosynthesized ZnO NPs under solar irradiation was studied and the results revealed the selective nature of the ZnO NPs for the adsorption and further photocatalytic degradation of the MO dye compared to the MB dye. In addition, the photocatalytic degradation of MO and MB dyes by the ZnO NPs under solar radiation was fitted by the first-order kinetics. Moreover, the photodegradation mechanism proposed that superoxide ions and hydroxyl radicals are the main reactive species.

Highlights

Tion of the methyl orange (MO) dye molecules was much more compared with the methylene blue (MB) dye molecule—52.3% and 27.2%, respectively, indicating the selective nature of the zinc oxide nanoparticles (ZnO NPs) for the adsorption and further photocatalytic degradation of the MO dye compared with the MB dye
Zinc oxide nanoparticles were biosynthesized using Ziziphus jujuba leaves extract assisted with microwave and used forbiosynthesized the photocatalytic using degradation of thejujuba methylleaves orange extract
The biosynsisted with microwave and used for the photocatalytic degradation of the methyl oran anionic dye and the methylene blue cationic dye under solar irradiation

Summary

Introduction

Nanotechnology is based on the preparation, characterization and applications of different nanoparticles (NPs) such as metals, metal oxides, semiconductors, ceramics and polymers, due to their outstanding morphological, structural and physicochemical properties allowed the NPs to be the used in a wide variety of applications.Among the most commonly used nanoparticles is zinc oxide nanoparticles (ZnO NPs), which are usually used in different applications, such as corrosion protection [1], food packaging [2], biomedical [3,4,5], electronics [6], revolutionizing agriculture [7], textiles [8]and as photocatalysts for environmental applications [9,10,11,12,13]. Among the most commonly used nanoparticles is zinc oxide nanoparticles (ZnO NPs), which are usually used in different applications, such as corrosion protection [1], food packaging [2], biomedical [3,4,5], electronics [6], revolutionizing agriculture [7], textiles [8]. The physical and chemical processes for synthesis of ZnO NPs. Nanomaterials 2021, 11, 1682. An alternative and interesting trend was adopted to minimize the generation of such chemical waste known as biosynthesis, or green synthesis, of nanoparticles, where various plant parts extract have been used for this synthesis, as the biosynthesis of ZnO NPs in comparison with conventional synthesis is recommended, as it has minimal impact on the environment and is without health risk [17]. The extract of various plants parts have been applied for the biosynthesis of ZnO

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Conclusion