Effect of ZnO/Ag Nanocomposites Against Anionic and Cationic Dyes as Photocatalysts and Antibacterial Agents
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Effect of ZnO/Ag Nanocomposites Against Anionic and Cationic Dyes as Photocatalysts and Antibacterial Agents Ramaraj Bhaviya Raj1 · Mahalingam Umadevi1 · Ramasamy Parimaladevi1 Received: 11 June 2020 / Accepted: 19 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Engineering efficient, strong and cost-effective nanoparticles with strong inhibitory activities are the growing need at present. Using the strategies of doping, Zinc oxide/Silver nanocomposites (ZnO/Ag NCs) namely 0.9 M ZnO: 0.1 M Ag, 0.7 M ZnO: 0.3 M Ag and 0.5 M ZnO: 0.5 M Ag were synthesized hydrothermally. The average crystallite sizes for the ZnO/Ag NCs were 31 nm, 29 nm and 23 nm. The band gap energy ( Eg) for the ZnO/Ag NCs was estimated to be 3.09 eV, 3.12 eV and 3.18 eV using Tauc’s plot. Grain-like morphological images was observed in the Scanning Electron Microscopy (SEM), which helps in effective promotion of degrading methyl orange (MO), methylene blue (MB) and crystal violet (CV) under visible light irradiation with a rate constant of 5 × 10–3/min, 16.6 × 10–3/min and 4 × 10–3/min respectively. This superior photocatalytic decomposition of dye are ascribed to smaller particle size, high surface area, the ability to absorb visible light and the efficient charge separation associated with the synergetic effects of appropriate amounts of ZnO and Ag in the prepared samples. In addition, the antibacterial efficacy of the NCs is observed as 90 and 100% for 75 μl. These hydrothermally synthesized synergistic NCs can be designed for large-scale fabrication of NC materials for potential applications in photocatalytic and antibacterial activity. Keywords ZnO/Ag nanocomposites · X-ray diffraction · Energy band gap · Photocatalytic activity · antibacterial activity
1 Introduction Colour has always mesmerized the mankind, for both aesthetic and social reasons. Dyes are the colored organic compounds used to impart colors to various substrates. Complete rainbow of colors are made available by azo dyes. The organic dyes from different sources such as paper, pharmaceutical, textile dyeing industry transport organic pollutants to natural water and make it contaminated. The toxicity and hazardous nature of different organic pollutants result in severe environmental and health problems [1]. The methyl orange (MO) is an anionic dye containing sulphonic or phenolic groups, and cationic dyes methylene blue (MB) and crystal violet (CV) comprise the amino group. Cationic dyes are tested to be more toxic than anionic dyes [2]. Hydrothermal method is a promising method to synthesize micro- and nanoparticles * Mahalingam Umadevi [email protected] 1
Department of Physics, Mother Teresa Women’s University, Kodaikanal‑624102, India
of high crystallinity and variety of crystalline metal oxides with high purity. This method has advantages like low cost, eco-friendly, low-temperature preparation, easy handling, etc. [3, 4]. Semiconductors photocatalysts with nanostructures are of great interest due to their astonishing physic
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