Showing papers by "Anjanapura V. Raghu published in 2021"

Gd3+ and Y3+ co-doped mixed metal oxide nanohybrids for photocatalytic and antibacterial applications

Abstract: Rare earth based mixed metal oxide nanohybrids have become unique and tend to show impressive performance in different fields of applications such as photocatalytic, and biological, and electrochemical systems. NiO-CGYO [nickel based yttria and gadolinia co-doped ceria, fabricated composition with a formula NiO-Ce0.9Gd0.1O2−δ –Ce0.9Y0.1O2−δ ] nanocomposite was prepared by the wet-chemical method by rare earth-based metal originators and examined for use in three applications such as electrochemical, photocatalytic and biological activity. The formation of fluorite cubic crystal structure with no secondary phase (XRD) was observed and metal-oxygen bonds (FT-IR) were revealed. SEM and EDAX analysis revealed chemically pure almost spherical nanocomposite particles with a size of 40–70 nm. The electrochemical behaviour assessed from room temperature up to 600 °C at 1.3 V in the frequency assortment from 42 Hz to 5 kHz showed maximum values of conductivity at elevated temperatures (500°C–600°C). The photocatalytic activity of the prepared NiO-CGYO nanocomposite resulted in 90% methylene blue (MB) dye degradation after 120 min. NiO-CGYO also demonstrated admirable antibacterial activity against foodborne pathogens comparable with that of the standard antibiotic (Streptomycin).

Investigation into the effects of SiO2/TiO2 nanolayer on the thermal performance of solar box type cooker

Abstract: The current study presents an experimental analysis of a stepped solar box type cooker (SSBC) using energetic SiO2/TiO2 nanoparticles focused on the different ratios of 5% to 25% with coating on th...

Metal Nitrides and Graphitic Carbon Nitrides as Novel Photocatalysts for Hydrogen Production and Environmental Remediation

Abstract: The demand for energy is growing day by day owing to population growth worldwide. There is thus a need to search alternate source of energy that is easily available and environmentally benign. Therefore, to meet the challenges and decrease the dependency on fossil fuel, researchers are focusing on alternative resources that are easy to handle, economic, environment-friendly, confined, and vast. Therefore, recent advances on metal nitrides for photocatalysts in energy storage, hydrogen production, sustainable organic conductor, and environmental purification are timely and are discussed in this chapter. The different types of metal nitrides such as covalent nitrides, ionic nitrides, boron nitrides, interstitial nitrides, metal nitrides, and sulfur nitrides are discussed, along with their preparation, fabrication, and application. Graphitic carbon nitride (g-C3N4) and transition metal nitride (TMN)-based photocatalysts have also been discussed.

Influence of nanotechnology to combat against COVID-19 for global health emergency: A review

Abstract: Covid 2019 is spreading and emerging rapidly all over the world as a new social disaster. This virus is accountable for the continuous epidemic that causes severe respiratory problems and pneumonia related to contamination of humans, which leads to a dangerous condition of life. Due to the increasing threatening number of cases all over the world, the world health organization (WHO) declared coronavirus as a global health emergency. The pandemic disease affected nearly 80 million people positive cases were reported worldwide till now and cause the death of more than 1.7 million people. The virus has novel characteristics types of pathogens. Many clarifications are done and much more are still unknown and pending. The collaborative research will be useful during this pandemic time in order to meet the improvement of global health improvement. It will also help to know about the knowledge of this COVID-19. Recent advancements in nanotechnology proved that they can help in the production of vaccines in a brief timeframe. In this review, the requirement for quick immunization improvement and the capability and implementation of nanotechnology combat against coronavirus disease were discussed.

Facile synthesis of Ni-doped ZnS-CdS composite and their magnetic and photoluminescence properties

Abstract: ZnS and CdS are promising semiconductors due to their excellent optical and catalyst properties. But, its low photon efficiency and high photo corrosion limit their practical applications. Heterojunctions construction and designing advanced structures with a suitable transition metal ions doping are active methods to improve the properties of semiconductors. In this work, Ni-doped ZnS-CdS hybrid composite was successfully synthesized using a simple chemical precipitation technique. X-ray diffraction, FT-IR spectroscopy, TEM, UV-Vis spectroscopy, PL, and VSM measurements were used to investigate the structural, morphological, optical, and magnetic properties of Ni-doped ZnS-CdS hybrid composite. The XRD analysis confirmed the incorporation of Ni2+ ions into the host lattice and the calculated average crystallite size is ~15.5 nm. The optical and EPR analysis confirmed that the dopant (Ni2+) ions occupy octahedral sites in the host lattice. From the CIE chromaticity diagram, it is revealed that the hybrid composite displayed green light emission. The presence of Zn-S and Cd-S vibrational bands is confirmed from the FT-IR spectrum. Room temperature ferromagnetism was observed in the Ni-doped ZnS-CdS hybrid composite.

Myco-Nanotechnology for Sustainable Agriculture: Challenges and Opportunities

Abstract: Nanotechnology is a fast-growing field of science that involves synthesis and development of various nanomaterials, its production, manipulation, and application of materials that range in size from less than a micron to that of individual atomic and/or sub-atomic sizes. Formation of nanoparticles employing fungi and their application in medicine, agriculture, and other areas are known as myco-nanotechnology. Fungal nanoparticles could be used in various fields including agriculture, industry, and medicine. In the present chapter, the status of research carried out on fungal nanoparticles in the area of agriculture is consolidated and presented. Myco-nanotechnology has emerged as one of the key eco-friendly technologies in the last decades, and its vast application in the management of bacterial and fungal diseases, pest control, preserved foods, and beverages is constantly being explored. Thus, myco-nanotechnology provides a greener alternative to chemically synthesized nanoparticles. Myco-synthesized nanoparticles found their vast application in pathogen detection and control, wound healing, food preservation, textile fabrics, and many more. The present chapter provides an appraisal on the applications of myco-nanotechnology in agriculture and looks into the prospects.