Recebido em 20/2/13; aceito em 18/7/13; publicado na web em 21/8/13 MODIFICATION AND CHARACTERIZATION OF RESIDUE ELECTRIC ARC FURNACE DUST (EAFD) FOR APPLICATION IN CHROMIUM (VI) REDUCTION REACTIONS. In this study, electric arc furnace dust (EAFD) was thermally modified at different temperatures under H 2 flow or charcoal in order to obtain reduced iron phases (Fe 3 O 4 , FeO and Fe 0 ). The formation of these phases was confirmed by powder X-ray diffraction. The tests performed for reducing Cr (VI) using resultant materials obtained after thermal treatment of the EAFD showed excellent results, with PAE600H (EAFD reduced at 600 ºC under H 2 flow) decreasing around 100% of the Cr (VI) in only 10 minutes of reaction. These results indicate the possibility of adding value to the residue, obtaining materials that offer great potential for environmental applications.
Nitroaromatic compounds appear as important agents in environmental contamination, with the highlight, its high resistance to microbial degradation. The reductive processes using metallic iron have been studied by several researchers with the purpose of formation of substrates that are less recalcitrant compounds. In this study the flue dust electric iron rich residue was thermally reduced under flowing hydrogen gas to obtain a composite phase reduced iron. This composite was used as reducing agent in transformation reaction of nitrobenzene to aniline. The results show that heat treatment of the residue promoted the formation of phases of reduced iron as FeO and Fe This material has high efficiency in reduction reaction of nitrobenzene to aniline, where the concentration of this contaminant was reduced ca. 86%.Keywords: electric arc furnace dust, nitrobenzene, reduction. INTRODUÇÃOO consumismo da sociedade atual atrelado ao crescimento demográfico tem demandado maior dedicação das indústrias para que intensifiquem suas atividades, o que consequentemente aumenta a geração de resíduos e a contaminação ambiental [1,2]. Os compostos nitroaromáticos, por exemplo, aparecem como importantes agentes na contaminação ambiental, tendo como destaque, a sua elevada resistência à degradação microbiana [3,4]. Dentre esta classe de compostos encontra-se o nitrobenzeno que é um composto tóxico e cancerígeno que tem sido utilizado em diversas indústrias para a produção de anilina, explosivos, tintas, plásticos, pesticidas e produtos farmacêuticos [5][6][7]. Reações redutivas de compostos nitroaromáticos utilizando ferro metálico tem sido relatado na literatura como alternativa viável para a formação de produtos menos tóxicos e mais biodegradáveis [6][7][8][9][10][11]
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