Abstract
In recent years, nanoparticles synthesis by green synthesis has gained extensive attention as a facile, inexpensive, and environmentally friendly method compared with chemical and physical synthesis methods. This review covered the biosynthesis of zinc oxide nanoparticles (ZnO NPs), including the procedure and mechanism. Factors affecting the formation of ZnO NPs are discussed. The presence of active bioorganic molecules in plant extract played a vital role in the formation of ZnO NPs as a natural green medium in the metallic ion reduction processes. ZnO NPs exhibit attractive photocatalysis properties due to electrochemical stability, high electron mobility, and large surface area. In this review, the procedure and mechanism of the ZnO photocatalysis process are studied. The effects of dyes amount, catalysts, and light on photodegradation efficiency are also considered. This review provides useful information for researchers who are dealing with green synthesis of ZnO NPs. Moreover, it can provide investigators with different perceptions towards the efficiency of biosynthesized ZnO NPs on dyes degradation and its restrictions.
Highlights
Eliminating environmental pollution has been under scrutiny and gained extensive attention
Due to the advances in using the biosynthesis approach in synthesis of zinc oxide nanoparticles (ZnO NPs), the researchers have used different types of plants and different parts. ere is no role in choosing a specific plant to synthesize ZnO NPs. e most important issue should concern that every part of the plant contains natural compounds that act as reducing agents
Biosynthesis of ZnO NPs using plant extract has been exposed to be a potential candidate because of lowcost, secure, and simplistic syntheses approaches compared with other microorganisms
Summary
Eliminating environmental pollution has been under scrutiny and gained extensive attention. Many researchers emphasized that the zinc oxide nanoparticle has unique properties for mineralization of organic pollution through a photocatalytic reaction and other applications [17, 18]. This study highlighted the efficiency of biosynthesized ZnO NPs on the removal of organic dyes. A combination of ZnO NPs and AOPs techniques to improve the degradation of organic dyes was proposed. A brief discussion was made of limitation of photocatalytic efficiency of ZnO NPs. In this study, the Internet, mainly the Google Scholar database, was used to find and download manuscripts related to biosynthesis and photocatalysis activities of ZnO NPs using suitable keywords such as organic pollution, zinc oxide, nanoparticles, and photocatalysis. E basis of the collection of the articles was (i) biosynthesis, (ii) zinc oxide nanoparticles, (iii) photocatalysis, and (iv) dyes degradation The Internet, mainly the Google Scholar database, was used to find and download manuscripts related to biosynthesis and photocatalysis activities of ZnO NPs using suitable keywords such as organic pollution, zinc oxide, nanoparticles, and photocatalysis. e basis of the collection of the articles was (i) biosynthesis, (ii) zinc oxide nanoparticles, (iii) photocatalysis, and (iv) dyes degradation
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