Jute fiber is the second most common natural cellulose fiber worldwide, especially in recent years, due to its excellent physical, chemical and structural properties. The objective of this paper was to investigate: the thermal degradation of in natura jute fiber, and the production and characterization of the generated activated carbon. The production consisted of carbonization of the jute fiber and activation with steam. During the activation step the amorphous carbon produced in the initial carbonization step reacted with oxidizing gas, forming new pores and opening closed pores, which enhanced the adsorptive capacity of the activated carbon. N 2 gas adsorption at 77K was used in order to evaluate the effect of the carbonization and activation steps. The results of the adsorption indicate the possibility of producing a porous material with a combination of microporous and mesoporous structure, depending on the parameters used in the processes, with resulting specific surface area around 470 m 2 .g -1 . The thermal analysis indicates that above 600°C there is no significant mass loss.

The ever growing focus on environmental issues has raised concerns about scrap tires, whose major component -vulcanized rubber -does not degrade easily. When burned, tires release toxic gases containing substantial amounts of sulfur and ammonia in addition to other pollutants. Dumped on empty city lots, tires are also a breeding ground for mosquitoes. Many proposals have been put forward to handle the disposal of scrap tires, but none of them have proved to offer a definitive solution. The study reported here investigated the production of fuel oil and activated carbon from the pyrolysis of scrap tires. The initial mass of rubber yielded approximately 46% of oil, 40% of activated carbon and 14% of gases. The resulting activated carbon displayed a specific surface area of 200 m 2 .g −1 .

RESUMO -Vazamento de gasolina resultando em contaminação de solo e água está se tornando cada vez mais frequente, em função disso é necessária a busca de uma técnica de descontaminação destas áreas. Uma das técnicas mais indicada para esse tipo de tratamento é a adsorção através de carvão ativado. Visando um estudo da capacidade de adsorção de alguns carvões ativados comerciais, nacional e importado, foram realizados ensaios de adsorção para a remoção dos poluentes oriundos da gasolina solúveis em água. Foram testados carvões ativados em pó em granular. Os carvões ativados em pó apresentaram maior capacidade de adsorção em relação aos carvões ativados granulares testados.

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