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Activated carbon prepared from yerba mate used as a novel adsorbent for removal of tannery dye from aqueous solution

Bruno Linhares, Caroline Trevisan Weber, Edson Luiz Foletto, Diego Silva Paz, Marcio A. Mazutti, Gabriela Carvalho Collazzo
Environmental technology 2013 v.34 no.16 pp. 2401-2406
Ilex paraguariensis, activated carbon, adsorbents, adsorption, aqueous solutions, environmental technology, mass transfer, models, pH, sorption isotherms, surface area, tanneries, texture, yerba mate
Activated carbon prepared from yerba mate (Ilex paraguariensis) was used as adsorbent for the removal of tannery dye from aqueous solution. The activated carbon was characterized, and it showed a mesoporous texture, with surface area of 537.4 m ² g ⁻¹. The initial dye concentration, contact time and pH influenced the adsorption capacity. The equilibrium data were in good agreement with both Langmuir and Freundlich isotherms. The adsorption kinetics of the tannery dye on activated carbon prepared from yerba mate followed a pseudo-second-order model. The adsorption process was found to be controlled by both external mass-transfer and intraparticle diffusion, but the external diffusion was the dominating process. This work highlights the potential application of activated carbon produced from yerba mate in the field of adsorption.