title: Photocatalytic activity of binary metal oxide nanocomposites of CeO2/CdO nanospheres: Investigation of optical and antimicrobial activity.
abstract: We report the synthesis of high quality CeO2-CdO binary metal oxide nanocomposites were synthesized by a simple chemical precipitation and hydrothermal method. Cerium nitrate and cadmium nitrate were used as precursors. Composition, structure and morphology of the nanocomposites were analyzed by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). XRD pattern proves that the final product has cubic phase and the particle size diameter of the nanocomposites are 27nm, XRD results also indicated that the crystalline properties of the nanocomposite were improved without affecting the parent lattice, FESEM analysis indicates that the product is composed of spherical particles in clusters. The morphological and optical properties of CeO2-CdO nanosamples were characterized by HRTEM and DRS spectroscopy. The IR results showed high purity of products and indicated that the nanocomposites are made up of CeO2 and CdO bonds. Absorption spectra exhibited an upward shift in characteristic peaks caused by the addition of transition metal oxide, suggesting that crystallinity of both the metal oxide is improved due to specific doping level. TGA plots further confirmed the purity and stability of nanomaterials prepared. Hence the nanocomposite has cubic crystal lattice and form a homogeneous solid structure. From the result, Cd(2+) ions are embedded in the cubic crystal lattice of ceria. The growth rate increases which are ascribed to the cationic doping with a lower valence cation. Ce-Cd binary metal oxide nanocomposites showed antibacterial activity, it showed the better growth inhibition towards p.aeruginosa. Exploit of photodegradation and photocatalytic activity of large scale synthesis of CeO2-CdO binary metal oxide nanocomposites was reported.
authors.affiliation: Department of Chemistry, St. Xavier's College (Autonomous), Tirunelveli 627002, India; LIFE, Department of Chemistry, Loyola College (Autonomous), Chennai 600034, India.
authors.forename: C Maria
authors.initials: CM
authors.lastname: Magdalane
authors.affiliation: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; Nanosciences African network (NANOAFNET), Materials Research Department (MRD), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa.
authors.forename: K
authors.initials: K
authors.lastname: Kaviyarasu
authors.affiliation: Catalysis and Nanomaterials Research Laboratory, Department of Chemistry, Loyola College (Autonomous), Chennai 600034, India.
authors.forename: J Judith
authors.initials: JJ
authors.lastname: Vijaya
authors.affiliation: Department of Microbiology School of Life Sciences, Pondicherry University, Puducherry 605014, India.
authors.forename: Busi
authors.initials: B
authors.lastname: Siddhardha
authors.affiliation: LIFE, Department of Chemistry, Loyola College (Autonomous), Chennai 600034, India. Electronic address: jeyaraj.boniface@gmail.com.
authors.forename: B
authors.initials: B
authors.lastname: Jeyaraj
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D019187:Cadmium Compounds / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D054118:Nanospheres / Q000737:chemistry*; D055620:Optical Phenomena; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D011550:Pseudomonas aeruginosa / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D019187:Cadmium Compounds; D010087:Oxides; C029663:cadmium oxide; D002563:Cerium; C030583:ceric oxide
keywords: Antibacterial effect; CdO; CeO(2); DRS; Photocatalytic studies; p.aeruginosa