Being an environmentally benign method biosynthesis of nanomaterial paying much more attention to researchers, it has many advantages over other routes, such as one pot, facile synthesis, and cost-effective; synthesized material can have good affinity due to surface modification and hence became a most attractive candidate for medicinal and biological applications. Moreover, biosynthesis creates a bridge of interdisciplinary research. Biosynthesis can be done by using bacteria, microbes, plant extracts, etc. In this study, we focus on the synthesis of some metal and metal oxide nanomaterials (M/MO NMs) by using an extract of parts from the Moringa oleifera plant. It is a natural source that can serve as a capping, stabilizing, and reducing/oxidizing agent due to the presence of some of the phytochemical parameters. Moreover, it is a rich source of antioxidants, including quercetin and chlorogenic acids, such as flavonoids, phenolics, astragalin, anthocyanins, cinnamates, and carotenoids, as well as a good source of carotene, iron, potassium, calcium, terpenes, quinines, saponins, alkaloids, proteins, tannins, and vitamin. These components produce smaller particles and give a compelling impact on the activities of M/MO NMs nanoparticles. Here, we discuss nanoparticles such as FeO, CuO, ZnO, NiO, MgO, Ag, and Au.

Calcium oxide nanoparticles (CaO NPs) have unique catalytic and biological properties; their activities are highly influenced by their morphology; as a result, these characteristics are most needed for various applications in several fields, including material science, environmental science, and medicinal science. The primary motivation for synthesizing CaO NPs using a biological method is to suppress the usage of hazardous chemicals used in making its process, which will be more cost-effective and ecologically profitable. However, due to the complexity of the biological extracts employed in chemical processes, large-scale manufacturing of nanoparticles via the green synthesis approach remains a significant problem. As a result, the production of CaO NPs utilizing Moringa oleifera plant leaves aqueous extract as an alternative biological agent for capping, stabilizing, and reducing agents due to rich phytochemical parameters in synthesis was investigated in this study. The structural characterization of the CaO NPs obtained by using UV-Vis, FTIR, XRD, and SEM-EDS indicates the presence of purity and primarily aggregated spherical nanosized material with an average size of 32.08 nm observed. The XRD study revealed that heat annealing increased the size of the crystallites, favoring monocrystalline. Finally, these findings, together with the cheap cost of synthesizing the plant-mediated CaO NPs produced, show good antimicrobial (gram-positive) activities.

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Background: The Novel coronavirus (COVID-19), which started in Wuhan (China) during December 2019, has spread to the rest of the world until now (July 2020). COVID-19 infections are more prevalent in developed countries rather than in the fast-developing, and underdeveloped countries. Now novel COVID-19 infection is a global health problem. In a fast-developing country like India, the incidence of coronavirus infections is increasing day by day. The fifth phase of lockdown has started in India to reduce the incidence of infection.Purpose: The purpose of this study of the impact of lockdown on the India’s environment, according to the literature survey from various research papers, news, social networking, government data (websites), etc., indicates that the lockdown helping to reduce transit in India and at the same time has a great impact on reduced pollution such as air pollution, water pollution, land pollution, etc., thus improving the balance of the environment after March 2020 onwards.Methods: In this work, we have used an online method using various online sources, which has mainly surveyed some important cities in India, have also studied the factors such as air pollution, river pollution, land pollution, etc. and its impact on Indian environment.Results: According to an online survey, lockdown has had a significant impact on the Indian environment, reducing the number of vehicles on the road that improving air quality, reducing river pollution, and having a positive impact on various fields. Lockdown has been very beneficial to the environment.Conclusions: The observations from various parts of the sources show that reduced pollution has also reduced the number of patients in hospitals, mainly jaundice (yellow fever), chikungunya, typhoid, respiratory diseases, etc. This review article explains the brief analysis of the impact of COVID-19 lockdown on India’s environment.

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