Abstract
In this work, the powder of the coconut husk was submitted to the hydrothermal pretreatment steam explosion. The effect of this pretreatment under the rigid lignocellulosic structure of biomass was evaluated from the analysis of hydrolyzable composition, XRD, specific surface area, and pore volume. The results confirmed that there was thermal degradation of hemicellulose, with an increase of the biomass crystallinity and porosity, favoring the adsorption of the monocomponent Cu2+ and Cd2+ at room temperature. The kinetic pseudo-second-order model and the Langmuir model isotherm described the adsorption process, with a maximum adsorption capacity of Cu2+ and Cd2+ of 18.86 and 17.9 mg/g, respectively. The effect of temperature on monocomponent adsorption was also studied. Coconut husk powder can be used efficiently after steam explosion for metal ion adsorption.
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