Síntese e caracterização do molibdato de estrôncio dopado com cobre, cobalto e zinco para fins fotocatalíticos

• Autor(a) principal: Dutra, Fabíola Bezerra
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38907
• topic: Síntese; Caracterização; Materiais dopantes; Fotocatálise heterogênea; Engenharias.

With the concern of contemporary society with environmental issues, new legislations, more stringent control of pollutants emissions of and more effective techniques for wastewater treatment has been implemented. In this context, heterogeneous photocatalysis is presented as a powerful alternative to be a rapid and efficient method for a complete contaminants mineralization. At recent years, ceramic materials have been receiving much focus on various studies and research due to its various properties such as: high melting points, mixed conductivity, high stability, among others and applications as, for example, the study of semiconductor materials, electrodes in technological devices and in particular in heterogeneous photocatalysis. This work deals with the synthesis and characterization of molybdate Strontium (SrMoO4) doped with copper, cobalt and zinc at the site A in the structure of this material (AMoO4, A = 0.9 Strontium + 0.1 dopant). The products were synthesized by complexation method EDTA / Citrate, with basic mean(pH ≈ 9), through thermal pretreatment for removing water and ammonia at 230 °C during 180 minutes and heating rate of 10 ° C.min- ¹ obtaining an amorphous precursor of the final powder. The precursors were then submited to heat treatment of 650 ° C with a fixed level of 180 minutes and a heating rate of 10 ° C min-¹. For the characterization of the products obtained were used Thermogravimetric Analysis (TG), X-Ray Diffraction (XRD), Particle size distribution by laser diffraction, Spectroscopy in the UV-Visible region, Energy Dispersive Spectroscopy (EDS) and Scanning Electron Microscopy (SEM). Finally, was carried out a brief study of the photocatalytic properties of these materials in a batch reactor under agitation.