Avaliação do potencial da casca do coco verde pré-tratada com NAOH na remoção de íons de cobre

Abstract

The growing concern about pollution generated in aquatic ecosystems has motivated many studies and research aimed at finding a viable treatment for this environment. In this context, this work aims to investigate the effects of using green coconut husk pre-treated with NaOH in the removal of copper ions. For this, the effects of the amount of adsorbent mass, pH of the solution, kinetics and adsorption equilibrium were evaluated. The results indicated an increase in the adsorption capacity for a pH value equal to 5. A contrary behavior was observed in the adsorption capacity when there was an increase in the adsorbent mass, which was already expected. From the kinetic study, it was possible to observe that in the first minutes of reaction, equilibrium was reached in approximately 5 minutes. The experimental data best fitted the pseudo-second order model. Among the mathematical models evaluated, it was observed that the Langmuir isotherm represents the best fit of the experimental data. Thus, the results showed that the use of green coconut husk pre-treated with NaOH presents appropriate characteristics for adsorption of copper and thus, can be an alternative to high cost adsorbents.