Mestrado em Química - PPGQ

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Navegando Mestrado em Química - PPGQ por Assunto "Adsorventes naturais"

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    Avaliação do uso de serragem de madeira tratada com ácido como bioadsorvente para a remoção de Diclofenaco de Sódio em meio aquoso
    (Universidade Federal de Goiás, 2015-08-13) Silva, Lícia Aparecida; Coelho, Luciana Melo; http://lattes.cnpq.br/0074807107314789; Coelho, Luciana Melo; Rezende, Hélen Cristine de; Freitas, Silvia de Sousa
    The present work describes the development of an analytical method for the removal of contaminant emerging Sodium Diclofenac (DCF) present in aqueous solutions. For the removal thereof, it is used as a natural adsorbent sawdust treated in acid medium. The detection and quantification of the analyte were Performed by High-Performance Liquid Chromatography (English, HPLC). The material was characterized according to the techniques of Infrared Spectroscopy and X-Ray Diffraction. The Point of Zero Charge (PZC) was obtained both for the sawdust treated in acid medium, and for the same in kind, obtaining values of 4.8 and 5.5, respectively. We chose to work with the adsorbent treated with acid in natural pH of the solution (6.43), since the adsorption was quite satisfactory (86%). It was determined the LD figures of merit (0.06 mg L-1) and LQ (0.2 mg L-1). The linearity was determined by construction of standard curves prepared in solvent and prepared curves with water samples fortified with the DCF standard. The obtained correlation coefficient was quite satisfactory (r = 0.9999) and the recovery values were between 86% and 117% to the study drug. It used Full Factorial Planning 23 for optimization of chemical variables that can have an effect on the adsorption process. The results obtained by the Pareto chart showed that the only variable that exerted influence on the adsorption was the mass of adsorbent. Therefore, it was determined by univariate optimization, as being 600 mg. To study the adsorption kinetics, it was determined the equilibration time of 180 min, and following the adsorption pseudosegunda-order model. The isotherm obtained was linearized and the result indicated that the adsorption follows the Langmuir model, ie, chemical adsorption occurs monolayer.