Photocatalytic and Antibacterial Activity Studies of ZnO Nanoparticles Synthesized by Thermal Decomposition of Mechanochemically Processed Oxalate Precursor

Abstract

The ZnO nanoparticles (NPs) have been prepared by thermal decomposition of zinc oxalate precursor ZnC2O4.2H2O synthesized by a simple solution‐free mechanochemical method. Thermogravimetric analysis/Differential thermal analysis (TGA/DTA) studies of oxalate precursor showed it to undergo two step decomposition yielding zinc oxide nanoparticles. The ZnO NPs have been thoroughly characterized by Powder X‐ray diffraction (XRD), Fourier Transform Infrared (FTIR), Transmission Electron Microscopy (TEM) and UV‐Visible techniques. XRD pattern showed that nanoparticles present hexagonal wurtzite phase of ZnO with high crystallinity. The Rietveld's refinement of the XRD pattern has shown the average grain size of the as synthesized nanoparticles to be 13 nm. The photocatalytic activity of as prepared ZnO NPs studied using Methyl Orange (MO) as probe molecule have effected ∼90 % degradation of 0.045 mM of MO in 100 min at catalyst load of 1.5 g L−1. As prepared ZnO NPs photocatalyst are appreciably stable and reusable. The antibacterial activity study of ZnO NPs assayed against Gram positive bacteria Staphylococcus aureus and Staphylococcus epidermidis and Gram negative bacteria Pseudomonas aeruginosaandEnterobacter aerogenes by MIC method has shown that as prepared ZnO NPs constitute effective antibacterial agents.

Deep-Level Emission Tailoring in ZnO Nanostructures Grown via Hydrothermal Synthesis

“…This phenomenon was also observed previously [64][65][66][67]. The a and c lattice constants are refined using the Rietveld method [62,63] and demonstrate excellent agreement with the lattice parameters of nanostructured ZnO materials reported previously (a-3.2504 Å and c-5.2063 Å, respectively) [57] and differ from the values corresponding to the monocrystal bulk (JCPDS Data Card No: 36-1451).…”

“…The GIXRD patterns of the as synthesized ZnO/Si(111) structures are presented in Figure 3 and show well-defined diffraction peaks of the ZnO P6 3 mc wurtzite crystal phase (JCPDS Data Card No: 36-1451) [ 57 , 58 , 59 ]. Structures are found free of impurities as they do not exhibit any characteristic XRD peaks other than that corresponding to ZnO.…”

Biological Evolution of New Intercalated Layered Double Hydroxides: Anticancer, Antibacterial and Photocatalytic Studies

“…The synthesized i‐ZANF band gap is 3.1 eV and e − /h + pairs are produced in system by light‐energy and produced oxy and hydroxyl radicals. The active oxy and hydroxyl radicals can effectively interact with bacterial cell wall finally bacteria was damaged by fragmentation . From this observation we can analyzed zone of inhibition and Minimum Inhibitory Concentration (MIC) for i‐ZANF.…”

Novel Pt-Ag3PO4/CdS/Chitosan Nanocomposite with Enhanced Photocatalytic and Biological Activities

“…The deployment of some transition metal nanoparticles (NPs) offers a practical approach in improving the potential biological properties. Silver is an excellent antibacterial agent because of its chemical and electronic structure, which enables it to penetrate the bacteria’s wall and kill them; the half maximal inhibitory concentration (IC 50 ) of silver NPs (AgNPs) is lower than other transition metal NPs, which makes it an appropriate candidate for different biomedical applications [ 1 , 2 , 3 , 4 , 5 ].…”