Estudo comparativo da adsorção de íons cu2+ e óleo em efluente sintético sobre materiais híbridos à base de argilominerais e quitosana

• Ano de defesa: 2015
• Autor(a) principal: Silva, Anne Priscila Oliveira da
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio Grande do Norte; Brasil; UFRN; PROGRAMA DE PÓS-GRADUAÇÃO EM QUÍMICA
• Palavras-chave em Português: Vermiculita; Bentonita; Quitosana; Caranguejo; Óleo; Cobre; Adsorção; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/20555

In recent years, researches have been developed to obtain new materials and methodologies aimed at minimizing environmental problems resulting from discharges of industrial effluents contaminated with heavy metals and oil. The adsorption has been used as an alternative technology effectively, economically viable and potentially important for the reduction of these contaminants, particularly when using natural adsorbents such as some types of clays. The vermiculite and bentonite clay as well as the biopolymer chitosan materials have been used as low-cost adsorbents. This study aimed to evaluate the potentiality of the hybrid materials obtained through the use of clay (expanded vermiculite and bentonite), with the chitosan with the aim of reducing the oil content and the metal ions for use in production waters generated by petroleum industry. The materials were characterized by diffraction of X-ray (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG / DTG), scanning electron microscopy (SEM) and gas adsorption measurements to textural analyzes. The XRD and SEM data, showed no significant change in the structures of clay mineral coated with chitosan in comparison to its shape natural. The results of FTIR observed that the presence of chitosan on the surface of clay minerals, due to the increased intensity of the characteristic absorption bands of the organic material. The adsorption tests conducted initially through a 22 planning showed that chitosan has a higher adsorption capacity than the natural vermiculite with a maximum of 89.22% on average for concentrations of 1000 mg/L. The results show that the capacity of removing ions by chitosan was, on average, 92.84% for copper concentrations in the range of 100 mg/L and 41.87 % at concentrations around 750 mg/L after 24 hours of contact. From the results it can be concluded that the incorporation of the polymer provides an improvement in adsorptive capacity of clay minerals studied an alternative to using low cost materials to reduce contaminants originating from the production water.