标题：Adsorption of basic dyes on activated carbon prepared from Polygonum orientale Linn: Equilibrium, kinetic and thermodynamic studies
作者：Wang, Li; Zhang, Jian; Zhao, Ran; Li, Cong; Li, Ye; Zhang, Chenglu
作者机构：[Wang, Li; Zhang, Jian; Zhao, Ran; Li, Cong; Li, Ye; Zhang, Chenglu] Shandong Univ, Sch Environm Sci & Engn, Jinan 250100, Peoples R China.
通讯作者地址：[Zhang, J]Shandong Univ, Sch Environm Sci & Engn, Jinan 250100, Peoples R China.
关键词：Polygonum orientale Linn activated carbon; Basic dyes; Adsorption; kinetics; Isotherm
摘要：Low cost activated carbon was prepared from Polygonum orientale Linn by phosphoric acid activation. Its ability to remove the basic dyes, malachite green (MG) and rhodamine B (RB) was evaluated. The surface area of P. orientale Linn activated carbon (PLAC) was found to be 1398 m(2)/g. The effects of experimental parameters such as initial concentration, contact time, pH, ionic strength and temperature on the adsorption were investigated. Alkaline pH was more favorable for MG adsorption, whereas acidic pH was better for RB uptake. Adsorption of dyes on PLAC was weakly dependent on ionic strength. The adsorption kinetics was found to be best represented by the pseudo-second-order kinetic model. The mechanism of the adsorption process was determined from the intraparticle diffusion model. The equilibrium adsorption data was well described by the Langmuir model. Thermodynamic study showed that the adsorption was a spontaneous, endothermic process. (C) 2009 Elsevier BM. All rights reserved.