竹炭对亚甲基蓝的吸附平衡和动力学研究

摘要

The adsorption equilibrium and kinetic of methylene blue dye on bambo carbon(BC) were examined at room temperature, and the effect of the original concentration of methylene blue and the amount of bamboo carbon were measured. Adsorption isotherm of the methylene blue (MB) on the bamboo carbon was determined and correlated with Langmuir and Freundlich adsorption isotherm equations. Two simplified kinetic models including pseudo-first-order and pseudo-second-order equation were selected to follow the adsorption processes. The result shows that the equilibrium data for methylene blue adsorption fit to the Freundlich equation(R2 =0. 99) well. The adsorption of methylene blue could be best described by the pseudo-second-order equation. The kinetic parameters of this best-fit model were calculated and discussed.%研究了室温下竹炭对亚甲基蓝的吸附平衡和动力学,考察了亚甲基蓝初始浓度和吸附剂用量的影响.由Langmuir吸附等温模型、Freundlich吸附等温模型对吸附平衡数据进行拟合 ;动力学由准一级反应方程和准二级反应方程进行拟合.研究结果表明:Freundlich吸附等温线模型(R2 =0.99)更为精确地描述了亚甲基蓝在竹炭上的吸附 ;吸附动力学由二级动力学模型拟合更为准确.对动力学数据进行了计算和讨论.