RESUMO-O objetivo do trabalho é avaliar a aplicação do bagaço de malte como material adsorvente no processo de adsorção do corante comercial azul 5G. Nos experimentos investigou-se a influência do pré-tratamento químico do bagaço de malte na adsorção do corante e a influência da velocidade de agitação na cinética de adsorção. Em cada experimento, alíquotas foram retiradas e a concentração de corante em solução quantificada mediante a leitura da absorbância em espectrofotômetro. Os resultados obtidos demonstraram que o bagaço de malte, resíduo da indústria cervejeira, pode ser utilizado em lavanderias industriais na adsorção do corante azul 5G de forma eficiente.
This study evaluated the prednisone removal from aqueous solutions using adsorption by an activated carbon of vegetal origin (VAC). A central composite rotatable design (CCRD) and the response surface methodology (RSM) were used to verify the influence of the parameters: pH, adsorbent dose and prednisone concentration in a batch adsorption process. Among the analyzed parameters, only the adsorbent dose and the prednisone concentration were statistically significant (α = 0.05) and the critical values obtained were adsorbent dose: 1.87 g/L, pH 7.56 and prednisone concentration: 3.66 mg/L with 77.51% of prednisone removal by VAC. The kinetic study of the adsorption of prednisone reached the equilibrium in 4 h. The pseudo-first-order model described adequately the kinetics data behavior. The equilibrium experimental data obtained at different temperatures showed that the VAC has a maximum adsorption capacity of 18.04 mg/g at a temperature of 30 °C. The prednisone removal decreased by the increasing temperature and the Langmuir isotherm well described the experimental data (R² > 0.98). Thermodynamic results shown that the prednisone removal of aqueous solutions by VAC is spontaneous and favorable process.
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