Mestrado em Química - PPGQ

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Navegando Mestrado em Química - PPGQ por Autor "Alves , Vanessa Nunes"

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    Resíduos agroindustriais como adsorventes para remoção de azul de metileno em meio aquoso
    (Universidade Federal de Goiás, 2016-06-08) Oliveira, Fabiano Mendonça de; Melo , Edmar Isaias de; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4736951H0; Coelho , Luciana Melo; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4794563A2; Coelho , Luciana Melo; Alves , Vanessa Nunes; Silva , Sidnei Gonçalves da; Melo , Edmar Isaias de
    The intensification of human actions, consumption, production and exploitation of raw materials, coupled with rapid population growth and development of industrial activity have caused major environmental impacts, affected the quality of water, soil and human health. The activities of the textile industry generally consume a lot of water, generating a high volume of waste, contributing to the increase in account-level determinants. Some of these contaminants show toxicity even at low concentrations, the dyes. Adsorption has been identified as a promising technique for the removal of dyes from effluents. The organic residues are low cost alternative materials, since considerable quantities thereof are discarded in the environment and have already reported the potential of these materials as adsorbents in removing pollutants. Therefore, this study was to evaluate the use of coconut fiber, bagasse from sugarcane and orange peel as adsorbents in removing the methylene blue dye in an aqueous medium. For both the adsorbent materials were subjected to different treatments using HCl, NaOH and hexane. The raw and processed materials were characterized using the techniques of scanning electron microscopy (SEM), Infrared Spectroscopy in the region and Rays Diffraction X. The parameters evaluated in the adsorption study particle size of the material, pH, agitation time , amount of adsorbent material and adsorption kinetic mechanism of adsorption equilibrium. Optimized kinetic data were fitted to the models of pseudo first order, pseudo second order, intraparticle diffusion and chemisorption, where we found that the most appropriate model was the pseudo second order. The experimental data of the isotherms were drawn to the models of Langmuir and Freundlich. The balance of experimental data fitted to the Freundlich model. The maximum adsorption capacity observed for the coconut fiber raw and treated with HCl, 166.67 and 104.8 mg g-1, respectively. The results show that the organic residues have potential application as adsorbent materials in the remediation of organic pollutants in particular, dyes in wastewater.