Biossorção de micropoluentes em fibra de sabugo de milho e detecção analítica usando fluorescência de raio x, espectroscopia Raman e análise quimiométrica
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2021-04-07
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Universidade Federal de Goiás
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The presence of micro-pollutants in the waters has led to growing concern due to the impact on human health. Among the most important molecules is Bisphenol-A (BPA), pesticides, hormones and dyes. On the other hand, micro-pollutant removal processes that make use of agro-industrial waste have aroused the interest of researchers. This is because the accumulation of lignocellulosic materials is also an environmental problem. The adsorption capacity was tested using the molecules BPA, diuron, cyproterone acetate, caffeine, erythrosine red and tartrazine yellow. The detection of these pollutants requires the use of sensitive and easy-to-handle techniques. In this context, the X-ray Fluorescence (FRX) and Raman spectroscopic methods are highlighted.The objective of this work is to use corncob agroindustrial residue (CC) as an adsorbent in the removal of micropollutants of aqueous matrix and detect them using FRX and Raman Spectroscopy. The values was treated using Chemoface Software and PLS (Partial Least Square) Model of calibration. The adsorption studies were carried out in reaction media containing the ground vegetable fiber and different concentrations of molecules, as well as at different pHs. Isotherms models and kinetic models were evaluated. The results showed that CC is a potent adsorbent in aqueous solution, leading to about 90% of removal for BPA. The adsorption kinetics followed the pseudo-second order model and isotherm that best suited the Lagmuir model, and the maximum adsorption capacity was 51.25 mg per gram of adsorbent fiber, after 20 minutes of contact. The chemometric analyze showed hat PLS model allows to determine a calibration model capable to reach high values of R2 and low values of error. The thermogravimetric analysis allowed to conclude that it is a material resistant to high temperatures, due to the presence of considerable amount of lignin. Finally, the best results of BPA removal efficiency by CC compared to activated carbon corroborate its high biosorption capacity.
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GOLVEIA, J. C. S. Biossorção de micropoluentes em fibra de sabugo de milho e detecção analítica usando fluorescência de raio x, espectroscopia Raman e análise quimiométrica. 2021. 91 f. Tese (Doutorado em Inovação Farmacêutica em Rede) - Universidade Federal de Goiás, Goiânia, 2021.