Síntese e caracterização de carbetos de molibdênio puro e dopado com cobalto e com níquel para degradação fotocatalítica e adsorção do corante Maxilon Blue GRL 300

Abstract

The search for processes of production of low cost materials has been studied in recent years, mainly by the industries, in order to relate the cost / benefit associated with low risk to the environment, and the ease of transport and its use. The transition metal carbides are gaining emphasis, due to their catalytic activity, stability and selectivity in a wide range of reactions. The purpose of doing doping with cobalt and nickel to the molybdenum carbide is the search for the improvement of its catalytic activity. The process of photocatalysis is based on a reaction that a semiconductor material is activated by the emission of solar or artificial light on the particles with sufficient energy to excite the electrons of the band of valence for the conduction band, that region between the bands is called "Bandgap". This work aims to develop the study of the synthesis, characterization and photocatalytic / adsorption application of semiconductor materials with carbide type structure, using the gas-solid reaction method in a fixed-bed reactor. These materials were characterized using XRD (crystallite size), TGA, BET, granulometry and MEV / EDS techniques. With its characterization, it was possible to understand the relation between its structural properties and its activities as heterogeneous catalysts. The results of photocatalysis were satisfactory, the studied carbides obtained good yield in the process of degradation and adsorption of the dye. The best result was for Mo2C_Ni 5% in acid medium with yield around 97% degradation / adsorption of the dye.