Navegando por Autor "Barbosa, Mylene Lourdes"

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    Influence of methyl groups in triphenylmethane dyes on their adsorption on biochars from cofee husks.
    (2022) Castro, Amanda Eugênio de; Martinho, Felipe da Silva; Barbosa, Mylene Lourdes; Franca, José Romão; Soares, Jenaina Ribeiro; Ferreira, Gabriel Max Dias; Ferreira, Guilherme Max Dias
    Biochars (BC), whose properties are highly dependent on the pyrolysis temperature used, have been proposed for the efcient removal of a vari- ety of contaminants from wastewater. In this work, pristine biochars were produced by the pyrolysis of cofee husks at temperatures of 400, 500, 750, and 900 °C, for use in the adsorption of pararosaniline (PRA) and methyl violet 10B (MV10B), which are triphenylmethane dyes with similar structures, but dif- ferent numbers of methyl groups. The biochars were characterized and the dye adsorption kinetics and equi- libria were investigated. FTIR and Raman spectros- copy analyses indicated that a higher pyrolysis temper- ature increased the aromaticity of the biochar surface structure, while decreasing the number of oxygenate functional groups. Higher adsorption capacities were generally observed at pH 7.5, with the maximum adsorption amounts increasing in the order BC900 ≈ BC750