ABSTRACT
Nanotechnology is regarded as the future of all technologies and the subject is evolving as a multidisciplinary research concept. Nanomaterials have currently found applications in almost all fields of science and technology. The wide use of metal nanoparticles (NPs) in the daily life of humans and their surrounding environment has urged the researchers to develop NP synthesis protocols that are economical, energy-efficient, and which can overcome the toxicity caused by chemically synthesized NPs. Therefore, nanotechnology and green chemistry combined and proposed the green methods for synthesizing such NP. Hence, this work explores the different approaches and methods that are used for NP production and it provides a brief explanation of how green methods are advantageous over other methods. Additionally, the influence of various factors such as temperature, reaction time, pH of the reaction medium, the volume of extract used, and the metal salt concentration used on the NP morphology and properties was investigated. The applications of green synthesized NPs have been highlighted as well and mostly these NPs are used in the applications meant for sustainable development. The work concludes that green methods of NP synthesis are the simplest, 214cheapest, and most effective methods for manufacturing NPs at a larger scale with no adverse environmental factors.
