摘要：Equilibrium and kinetic data for the adsorption of Congo-red dye from aqueous solution onto activated ricehusk carbon have been reported. The effects of dye initial concentration, adsorbent-adsorbate contact time,temperature, adsorbent’s amount and particle size on the percent adsorption of the dye on the adsorbenthave been investigated. Kinetics of adsorption of Congo-red onto the adsorbent in aqueous solution wasmonitored spectrophotometrically. At the specified dye initial concentration, percent adsorption of dye increaseswith increase in temperature as well as the adsorbate-adsorbent contact period. However, at the giventemperature, % adsorption of Congo-red decreases with the increase in dye initial concentration. The observedadsorption data were analysed in light of Langmuir and Freundlich adsorption isotherms. Dye adsorptionrate constant (k ad ) follows the first order kinetics. Activation energy (E a ) of adsorption, intra-particle diffusionrate constant and thermodynamic parameters of Congo-red adsorption on the rice-husk carbon have beenevaluated and interpreted.
