Renault François, Morin-Crini Nadia, Gimbert Frédéric, Badot Pierre-Marie, Crini Grégorio
University of Franche-Comté, Laboratory of Chrono-Environment, UMR UFC/CNRS 6249, USC INRA, Place Leclerc, 25030 Besançon cedex, France.
Bioresour Technol. 2008 Nov;99(16):7573-86. doi: 10.1016/j.biortech.2008.02.011. Epub 2008 Apr 9.
This article describes the use of a cationized starch-based material as new ion-exchanger adsorbent for the removal of C.I. Acid Blue 25 (AB 25) from aqueous solutions. Batch adsorption studies concerning the effects of contact time, pH and temperature are presented and discussed. Adsorption experimental data showed that: (i) the process was uniform and rapid: adsorption of dye reached equilibrium in 50 min in the wide pH range of dye solutions; (ii) adsorption kinetics followed the pseudo-second order model; (iii) the Langmuir model yielded a much better fit than the Freundlich model for the dye concentration range under study; (iv) this adsorbent exhibited interesting adsorption capacities: on the basis of the Langmuir analysis, the maximum adsorption capacity was determined to be 322 mg of dye per gram of material at 25 degrees C; (v) the adsorption capacity decreased with increasing temperature; and (vi) the negative value of free energy change indicated the spontaneous nature of adsorption.
本文描述了一种基于阳离子化淀粉的材料作为新型离子交换吸附剂用于从水溶液中去除酸性蓝25（AB 25）的应用。文中展示并讨论了关于接触时间、pH值和温度影响的批量吸附研究。吸附实验数据表明：（i）该过程均匀且迅速：在较宽的染料溶液pH范围内，染料吸附在50分钟内达到平衡；（ii）吸附动力学遵循准二级模型；（iii）对于所研究的染料浓度范围，朗缪尔模型的拟合效果远优于弗伦德里希模型；（iv）这种吸附剂表现出有趣的吸附容量：基于朗缪尔分析，在25℃时，每克材料对染料的最大吸附容量确定为322毫克；（v）吸附容量随温度升高而降低；（vi）自由能变化的负值表明吸附是自发进行的。
