Potential Application of Alternative Materials for Organic Pollutant Removal
2022
da Costa, Matheus Londero | Pavoski, Giovani | Espinosa, Denise Crocce Romano | de Vasconcellos, Noeli Júlia Schüssler | da Silva, William Leonardo
The work aims to synthesize and characterize vegetal charcoal (or biochar) from Syzygium cumini (AC-SC), evaluating the adsorption capacity for dexamethasone drug (DEX) removal, using the kinetic and equilibrium adsorption. The samples were characterized by N₂ porosimetry, X-ray diffraction, scanning electron microscopy with energy-dispersive spectroscopy, zeta potential, and zero charge point. Adsorption equilibrium was carried out applying the Langmuir, Freundlich, Redlich-Peterson, Sips, and Toth models, and kinetic adsorption applied the pseudo-first order, pseudo-second order, Elovich, Avrami, and Weber-Morris models. AC-SC showed a heterogeneous and porous surface, negatively charged, crystalline structure, specific surface area of the 2.14 m² g⁻¹ and pHZCP = 7.36. About the effect of the AC-SC concentration, 5.0 g L⁻¹ showed the best DEX removal (53.02%), about the others’ concentration (2.0 and 7.5 g L⁻¹). About the equilibrium and kinetic adsorption, the Sips model and pseudo-second order showed the best experimental data adjusted, indicating that the adsorption monolayer was dependent on the ions onto the biosorbent, with a maximum adsorption capacity of 0.744 mg g⁻¹ after 180 min. Therefore, AC-SC can be used as an alternative material in the removal of organic pollutants, such as drug removal.
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