Resumo

FOLETTO, E. L. et al. Use of rice hull as a biomass sorbent for organic pollutant removal: adsorption isotherms and thermodynamic. Lat. Am. appl. res. [online]. 2013, vol.43, n.1, pp. 1-5. ISSN 1851-8796.

The present study describes the adsorption of textile dye on rice hull. The adsorption parameters were obtained from Langmuir and Freundlich isotherms utilizing linear regression plots to fit the data. The results showed that Langmuir equation was more suitable than the Freundlich one to predict the experimental adsorption isotherms, indicating that the adsorption of dye molecules is localized in a monolayer on the surface of the adsorbent. Thermodynamic parameters such as ΔH_a, ΔS_a and ΔG_a were determined in this work. The heat evolved during adsorption is endothermic. The maximum sorption capacity of rice husk was satisfactory when compared to capacities of other low-cost adsorbent materials.

Palavras-chave : Adsorption; Dye; Rice Hull; Isotherm; Thermodynamic.