Synthesis and characterization of nanoparticles niobia (Nb2O5) by the method of peroxide oxidizer by hydrothermal route and study of photocatalytic properties.

• Grant number: 11/16546-7
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2012
• End date: July 31, 2013
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Cauê Ribeiro de Oliveira
• Grantee: Osmando Ferreira Lopes
• Host Institution: Embrapa Instrumentação Agropecuária. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA). Ministério da Agricultura, Pecuária e Abastecimento (Brasil). São Carlos , SP, Brazil

Abstract

The treatment of wastewater containing organic compounds such as dyes and pesticides is still a concern, so the development of efficient methods and materials to accomplish the degradation of organic compounds and subsequent reuse of water is required. Treatment methods of great interest are the advanced oxidation processes, which apply semiconductors as photocatalysts. These systems have been intensively studied due to the increased efficiency of degradation of these compounds. Thus, this project proposes the optimization study of Nb2O5 nanoparticle synthesis (at different stages), obtained by the oxidant peroxide method and under hydrothermal conditions for crystallization and subsequent study of photocatalytic properties of the material. This method is proposed since it is considerably simple and dispenses organic /inorganic additive compounds that can be harmful, and carried out in milder conditions. The characterization of the obtained materials will be made through conventional techniques such as X-ray diffraction (XRD), Raman spectroscopy, surface area (BET method), photoluminescence spectroscopy, scanning electron microscopy (SEM) and advanced techniques such as transmission electron microscopy high resolution (HRTEM). Photocatalytic efficiency tests will be performed on a bench with fotoreator UV-Vis, mainly using pesticides as substrates for degradation, the removal efficiency will be monitored by UV-Vis spectroscopy, observing the degradation of compounds and correlating it to the characterization.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

LOPES, OSMANDO F.; PARIS, ELAINE C.; RIBEIRO, CAUE. Synthesis of Nb2O5 nanoparticles through the oxidant peroxide method applied to organic pollutant photodegradation: A mechanistic study. APPLIED CATALYSIS B-ENVIRONMENTAL, v. 144, p. 800-808, JAN 2014. (11/16546-7)

OSMANDO F. LOPES; VAGNER R. DE MENDONÇA; FERNANDO B. F. SILVA; ELAINE C. PARIS; CAUE RIBEIRO. ÓXIDOS DE NIÓBIO: UMA VISÃO SOBRE A SÍNTESE DO Nb2O5 E SUA APLICAÇÃO EM FOTOCATÁLISE HETEROGÊNEA. Química Nova, v. 38, n. 1, p. 106-117, 2015-01-00. (11/16546-7)