Compósitos magnéticos formados por estruturascarbonáceas sobre matrizes inorgânicas paratratamento de efluentes

Abstract

In this work, magnetic carbonaceous nanostructured composites were developed using Chemical Vapor Deposition (CVD) process and two inorganic supports: synthetic (MgO) and natural (chrysotile). Further, the obtained composites were tested for environmental applications in the treatment of wastewater. Chapter 1 provides a literature review on the process of obtaining the magnetic carbonaceous composites, followed by a brief study of environmental applications proposed in this work. A detailed description of reagents, equipment used and methodology applied in the work is shown in Chapter 2. Chapter 3 shows the synthesis of magnetic carbonaceous composites, obtained using a synthetic matrix (MgO), were characterized by RTP, TPCVD, CHN, TG/DTG, Mössbauer, XRD, Raman, SEM, TEM, EDS, adsorption/desorption of N2 and magnetization measurements. The influence of the molybdenum on the material was investigated in bimetallic catalyst systems of Fe/Mo impregnated on the surface of MgO to grow the carbon structures using methane as the carbon source. Chapter 4 shows the synthesis of magnetic carbonaceous composites, obtained using a natural matrix (chrysotile), were characterized by CHN, TG/DTG, Mössbauer, XRD, Raman, SEM, EDS, adsorption/desorption of N2 and magnetic measurements. The influence of metal catalyst used (Fe or Co) on the CVD process using different temperature (600-900 ° C) was investigated for the production of carbonaceous structures using ethanol as carbon source. Finally, Chapter 5 shows tests for environmental applications in the treatment of wastewater. In general, the obtained composites showed good potential for waste remediation, i.e., (i) breaking the emulsion (ii) turbidity removal of a real effluent from biodiesel production process, and (iii) the color removal from aqueous solutions of methylene blue.