Removal of Cationic Dye from Aqueous Solution by Adsorption on Activated Carbon Developed from Xanthoceras Sorbifolia Bunge Hull
Adsorption of cationic dye, methylene blue (MB) onto Xanthoceras Sorbifolia Bunge hull activated carbon (XSBHAC) developed by zinc chloride solution activation has been investigated. Exp eriments were carried out as function of contact time, pH (2-10) and temperature (293, 303, 313 and 323K). Adsorption isotherms were modeled with the Langmuir and Freundlich isotherms. The data fitte d well with the Langmuir isotherm. The Langmuir monolayer saturation capacities of MB adsorbed onto activated carbon were 501.32, 534.54, 588.30 and 593.28mg/g at 293, 303,313, and 323 K, respect ively. The kinetic models were also studied. The rates of adsorption were found to conform to the pseu do-second-order kinetics with good correlation. Using the equilibrium concentration contents obtained at different temperatures, various thermodynamic parameters, such as△G, △H and△S, have been calc ulated.The thermodynamics parameters of system indicated spontaneous and endothermic process.
Joong Hee Lee
Y. N. Hao et al., "Removal of Cationic Dye from Aqueous Solution by Adsorption on Activated Carbon Developed from Xanthoceras Sorbifolia Bunge Hull", Advanced Materials Research, Vols. 123-125, pp. 367-370, 2010