| Autor: |
Melo ALFC; Federal Institute of Piauí, Floriano Campus, Floriano 64808-475, PI, Brazil., Carneiro MT; Federal Institute of Piauí, Floriano Campus, Floriano 64808-475, PI, Brazil., Nascimento AMSS; Interdisciplinary Laboratory for Advanced Materials, Teresina 64049-550, PI, Brazil., Morais AIS; Interdisciplinary Laboratory for Advanced Materials, Teresina 64049-550, PI, Brazil., Bezerra RDS; Federal Institute of Piauí, Teresina-Central Campus, Teresina 64000-040, PI, Brazil., Viana BC; Interdisciplinary Laboratory for Advanced Materials, Teresina 64049-550, PI, Brazil., Osajima JA; Interdisciplinary Laboratory for Advanced Materials, Teresina 64049-550, PI, Brazil., Silva-Filho EC; Interdisciplinary Laboratory for Advanced Materials, Teresina 64049-550, PI, Brazil. |
| Abstrakt: |
Given the increase in environmental pollution, especially of water, the emergence of studies that seek to develop strategies to mitigate/treat such effects have gained prominence in the world scientific community. Among the numerous adsorption processes, those made from biochar production stand out. This study analyzed the adsorption properties of the blue methylene model dye in the aqueous solution of biochar and activated biochar developed from pequi ( Caryocar brasiliense ) endocarp. The biochar was characterized, before and after adsorption, by infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and thermogravimetric analysis (TG). The surface load of the materials was performed by the point of zero charge (pH PZC ) method. The study also included analyses of contact time parameters and adsorbed concentration in the adsorption process. Morphological analysis showed that a more significant and profound number of fissures and pores appeared in the activated biochar compared to the biochar. Residual mass analysis evidenced that biochar lost about 15% more mass than the activated biochar, indicating that activation occurred satisfactorily. The adsorption process was well adjusted by pseudo-second-order kinetics and Langmuir's isothermal model. The activated biochar achieved an excellent adsorption capacity of 476.19 mg.g -1 , thus demonstrating to be a sound system for removing dyes from an aqueous medium. |
