Navegando por Autor "Sousa, Priscila Afonso Rodrigues de"

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    Avaliação da adsorção de contaminantes emergentes pela casca de banana e folhas da Typha Angustifolia L.
    (Universidade Federal de Goiás, 2015-04-10) Sousa, Priscila Afonso Rodrigues de; Coelho, Luciana Melo; http://lattes.cnpq.br/0074807107314789; Coelho, Luciana Melo; Richter, Eduardo Mathias; Freitas, Sílvia de Sousa
    This paper describes the use of analytical methodology for removal of emerging contaminants sulfamethoxazole (SMX), 17α-ethinylestradiol (EE2) and estrone (E1) in water samples. Was used to remove the natural adsorbents Banana and Typha angustifolia L.in raw and treated in acidic medium. The detection and quantification was performed by high performance liquid chromatography (English, HPLC). There was a characterization of bioadsorventes by Infrared Spectroscopy East and X-ray diffraction The point of zero charge of in natura banana peels and treated with HCl was approximately 5.6 and 4.3, respectively, while point of zero charge of Typha angustifolia in natura leaves and treated with HCl was approximately 5.5 and 4.5, respectively. It was determined that the pH only influences the adsorption exerted SMX, and the pH 2 and 8 were most suitable. However, we chose to work with natural pH of the mixtures of the compounds (pH = 5.25). This study used multivariate methods (full 23 factorial design and response surface) to verify the best chemical variables. The optimized and used for construction of isotherms conditions were: cattail in kind (m = 0.38 g; t = 65 min), cattail HCl (m = 0.75 g; t = 64 min), fresh banana (m = 0, 55g, t = 62 min) and banana HCl (m = 0.76g; t = 66 min). There was the determination of LD figures of merit (SMX = 0.02 mg L-1, EE2 = 0.03 mg L-1, E1 = 0.03 mg L-1) QL (SMX = 0.05 mg L-1, EE2 = 0.05 mg L-1, E1 = 0.05 mg L-1), the selectivity was determined by building fortified calibration curves with water samples. The linearity was determined by the correlation coefficient (r = 0.99), recovery values were between 59.9% and 93.6% for the compounds and accuracy of results presented at most 14.7%. The proposed methodology has been applied to real matrix with removal percentages close to 100%.