Abstract
SOx and NOx are emissions resulting from combustion processes and are the main agents that contribute to the formation of acid rain, which causes harm to humans and the environment. Several techniques for removing these pollutants are applied in i.e. oil refineries, thermoelectric that use petroleum oils and vehicular pollution. Among these, highlight the adsorption of contaminants by the usage of activated carbon fibers and activated carbon, which are characterized by high surface area and uniform distribution of pores, providing appropriate conditions for application in processes of removing environmental contaminants. In the present work, activated viscose fibers (AVF) were prepared and applied in adsorption experiments of NO and SO2. The materials produced showed high values of surface area, with a predominance of micro pores with diameters in the range of 1.0 nm. The AVF had satisfactory performance in the removal of contaminants and are compatible with other synthetic fibers. Thus, the formation of active sites of carbon provides contaminants adsorption, demonstrating that carbon fibers cloth can be applied for the removal of pollutants.
Highlights
Natural, artificial and synthetic fibers are used as raw materials for producing activated carbon fibers, which generally have a high adsorption capacity.The production process of viscose reached an industrial scale in 1905 through chemical treatment of wood pulp and cotton linter to form the viscose rayon and the acetate (Bastion 2009)
The samples of activated viscose fibers (AVF) had a yield of 20.4±1.1%, similar to that of activated PAN fibers (Zaini et al 2010) and activated carbons produced from biomass (Tan et al 2008, Asadullah et al 2010)
Results show that the AVF samples have a high fraction of micro pores (%)
Summary
Artificial and synthetic fibers are used as raw materials for producing activated carbon fibers, which generally have a high adsorption capacity.The production process of viscose reached an industrial scale in 1905 through chemical treatment of wood pulp and cotton linter to form the viscose rayon and the acetate (Bastion 2009). Woven fabrics of activated carbon fibers (ACF), derived from artificial and synthetic raw materials, were produced with uniform pore distribution and a high surface area. ACFs in the form of felts or woven fabrics have advantages including higher specific surface areas of up to 1,000 m2.g-1, mechanical integrity, easy handling and use in adsorption processes. They have shown potential for being used in the removal of various microorganisms, harmful compounds, phenolic, pesticides, dyes, polycyclic aromatic hydrocarbons and volatile organic compounds (VOCs), as well as SOx and NOx (Asakura et al 2004)
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