Cinética de adsorção de derivados de hidrocarbonetos policíclicos aromáticos em EPU, PEAD, Amberlite XAD-2

Abstract

Polycyclic Aromatic Hydrocarbons (PAH) are organic molecules stable constituted by aromatic rings fused. The PAH, nitrogenous and oxygenates (Nitro-PHA and Oxy-PHA) composes this class of compounds where there is the presence of a heteroatom of nitrogen and oxygen, respectively in your constitution. One of your main sources is the incomplete combustion of fossil fuels. The insertion of the heteroatom entails a greater mobility and increase of the potential toxicological. Adsorption processes are used for the purpose to decrease the concentration of PAH and its derivatives in aqueous samples or atmospheric. In this study is has evaluated various kinetic models existing to determine that one which best would suit to process of adosption of Nitro-PAH and Oxi-PAH at the adsorbents high density polyethylene (PEHD), Polyurethane foam (PUF) and Amberlite XAD-2 in the temperatures of 20 and 60°C for the data obtained experimentally by Colim, A.N. (2014). In addition, is has evaluated as well through the groupings analysis the similarity as which the adsorvatos behave in front of the adsorbents, this analysis allows that establish a pattern of behavior by comparing the compounds among themselves for each adsorbent. The kinetic model of pseudo-second-order showed to be the suitable model for expressing the adsorption kinetics and calculation of the kinetic constant, this model was chosen because has presented better correlation of the data and meet with the literature found about the subject. Through the grouping analysis is has highlighted the compound 2-hydroxyfluorene demonstrating distinct behavior and in greater proportion in relation to the others. Becomes necessary more deepened studies concerning the adsorption of these compounds, procedures in a third intermediate temperature must be performed to determine the type of adsorption and establish a mechanism for such.