| Afiliação do(s) autor(es): | [1] Univ Aveiro, Dept Chem, CICECO, P-3810193 Aveiro - Portugal
[2] Univ Fed Sao Carlos, Polymer Lab, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Fed Sergipe, Dept Chem, BR-49100000 Itabaiana, Sergipe - Brazil
[4] Univ Fed Sergipe, Dept Chem, BR-49100000 Sao Cristovao, Sergipe - Brazil
Número total de Afiliações: 4
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The rice husk ash (RHA) was used as an alternative source of silica for the synthesis of the functionalized mesoporous material, which was used in the removal of the PAHs naphthalene (Nap), benzo{[}b]fluoranthene (B{[}b]F), benzo{[}k]fluoranthene (B{[}k]F), and benzo{[}a]pyrene (B{[}a]P) from aqueous media. The PABA-MCM-41 (RHA) was characterized using FTIR, TGA, SAXS, and N-2 adsorption-desorption analyses. Removal experiments were performed to determine the initial concentrations, individual adsorption in comparison with the mixture of the PAHs, PABA-MCM-41 (RHA) amount, pH, time, and temperature, and the results obtained were statistically analyzed. The PABA-MCM-41 (RHA) presented the S-BET, V-T, and D-BJH values of 438 m(2) g(-1), 0.41 cm(3) g(-1), and 3.59 nm, respectively, and good thermal stability. The q(e) values found in the kinetic equilibrium for the PAHs mixture followed increasing order: Nap < B{[}a] P < B{[}k]F < B{[}b]F, with removal percentages of 89.08 +/- 0.00, 93.85 +/- 0.28, 94.54 +/- 0.10, and 97.80 +/- 0.05%, respectively. (AU) |