Nanopartículas de cobalto e monolitos cerâmicos recobertos com carbono utilizados para remediação ambiental

Abstract

Nanoparticles of cobalt and ceramic monoliths were recovered by carbon through the catalytic carbon chemical vapor deposition (CCVD), and they were utilized for the removal of organic contaminants by adsorption/oxidation process. The cobalt nanoparticles get a magneticbehavior when submitted to a CCVD process, and they produce carbon filaments like nanotubes as carbon products. Those new characteristics allow them to work both as potential adsorbents and magnetic supports for metal impregnation on its surface. It makes them useful forheterogeneous catalysis in hydrogenation reactions, by the palladium impregnation, and in oxidation reactions, by the impregnation of cobalt or iron. The magnetic properties, the specific area besides the quality and the amount of obtained carbon produced under three differenttemperatures, e.g. 700, 800 and 900 oC, were investigated. The ceramic monoliths were impregnated with salts of cobalt and iron, further they were thermally treated for finally be submitted to a CCVD process, what partially covered them with carbon by the production of filaments. The quality and the amount of carbon obtained were studied. The ceramic monoliths recovered by carbon and the ceramic monolith just impregnated with metals were both tested as catalysts in oxidation reactions.