Remoção de fenol em efluente sintético através de adsorção com carvão ativado

Abstract

Phenol is a compound found in effluents from various industry sectors accounting for part of the pollution of water bodies. Due to the toxicity of this compound to the environment it is necessary to remove them before disposal of these effluents. Among the different processes that can be used in order to minimize the deleterious effects of contaminants in water, the most important are the adsorption processes. One of the adsorbents most used in this type of process is activated carbon, its use has been widely used since its high efficiency in the removal of contaminants in wastewater. In this context the present study sought to evaluate a phenol removal in synthetic waters in a batch system using as activated adsorbent produced from coconut shell. Kinetic studies were performed using the pseudo first and second order models and intraparticular diffusion models, which showed that second order pseudo kinetics better fitted the data, describing the adsorption rate better. The equilibrium studies were conducted at three different temperatures, 25, 35 and 45 ° C, showing that adsorption is temperature dependent, being as large as temperature, lower adsorption. The data were adjusted as isotherms of Langmuir and Freundlich, where is a Langmuir isotherm presented better fit. In addition, there is a more appropriate procedure for the term extermination and spontaneous. The results showed that the mechanism of coconut hull production was efficient in the removal of phenol.