Adsorption Kinetics and Thermodynamics of Auramine-O on Sugarcane Leaf-Based Activated Carbon

作者：Qi, Congliang; Meng, Mianwu^*; Liu, Qingye; Kang, Caiyan; Huang, Siyu; Zhou, Zhenming; Chen, Chunqiang

来源：Journal of Dispersion Science and Technology, 2015, 36(9): 1257-1263.

DOI：10.1080/01932691.2014.973036

• Activated carbon
• Auramine-O
• kinetic study
• thermodynamic study

The removal efficiency, adsorption kinetics, and thermodynamics of Auramine-O (AO) onto sugarcane leaf-based activated carbon prepared by ammonium dihydrogen phosphate were investigated systematically. The optimal AO removal conditions were found to infuse 1.2 g/L sugarcane leaf-based activated carbon in 200 mg/L AO solution which the initial pH (pHO) was 9.0 for 180 minutes. The adsorption kinetics of AO was described well by the pseudo-second-order and intra-particle diffusion model. The intra-particle diffusion was not the exclusive rate controlling step in the adsorption process. The isotherm obeyed the Langmuir isotherm with a high correlation coefficient (R-2 > 0.99), and the thermodynamic analysis suggested that Delta G < 0, Delta H < 0, Delta S > 0, which indicated that the adsorption of AO onto sugarcane Delta H > 0, and AS > 0, which indicated that the adsorption of AO onto sugarcane leaf-based activated carbon was a spontaneous chemical and endothermic adsorption process.

• 出版日期2015
• 单位广西师范大学