Abstract: In order to explore the adsorption performance of the porous carbon material prepared from waste cellulose fiber on removing organic dyes from water and to design a reasonable system, different adsorption systems, in which the porous carbon prepared using waste regenerated cellulose fiber was used as the adsorbent and methyl orange dye was used as the adsorbate, were established. Adsorption equilibrium and kinetic data were obtained. The adsorption equilibrium of the material was evaluated using Langmuir and Freundlich isotherm formula. The experimental kinetic data were simulated using pseudo-first order and pseudo-second order kinetic models. Based on the results of equilibrium and kinetic simulations, the adsorbent dosage and the optimal adsorption time were evaluated by the batch adsorption method. Experimental results show that the Freundlich adsorption isotherm formula is more suitable to evaluate the adsorption equilibrium of the porous carbon for methyl orange, indicating that the adsorbent surface is heterogeneous and a multi-layer adsorption occurs on the adsorption surface. The pseudo-order kinetic model can describe all the adsorption process of the carbon for methyl orange, and the two-stages batch adsorber model can achieve high removal efficiency of methyl orange in a shorter time.

Key words: porous carbon, adsorption, methyl orange, kinetics, adsorption design

摘要： 为了探究纤维素纤维制备的多孔炭材料去除水中有机染料的吸附性能并设计合理的吸附体系,以废弃再生纤维素纤维制备的多孔炭为吸附剂,甲基橙染料为吸附质,构建了不同的吸附体系,获得吸附平衡和动力学数据。运用Langmuir和Freundlich吸附等温方程评估材料的吸附平衡,应用准一级和准二级动力学模型对动力学数据进行了模拟,进而基于平衡和动力学模拟结果,采用静态吸附法评估了吸附体系所用的吸附剂用量和最优吸附时间。结果表明:Freundlich吸附等温线方程更适合于评估该多孔炭材料吸附甲基橙的吸附平衡,说明表面吸附不均匀且存在多层吸附;准二级动力学模型能很好地描述该多孔炭吸附甲基橙的所有吸附过程;两级吸附器模型可以在短时间内实现较高的甲基橙去除效率。

关键词: 多孔炭, 吸附, 甲基橙, 动力学, 吸附设计