Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China.
Int J Biol Macromol. 2012 Mar 1;50(2):444-50. doi: 10.1016/j.ijbiomac.2011.12.016. Epub 2011 Dec 23.
A novel nano-adsorbent, β-cyclodextrin-chitosan (CDC) modified Fe(3)O(4) nanoparticles (CDCM) is fabricated for removal of methyl blue (MB) from aqueous solution by grafting CDC onto the magnetite surface. The characteristics results of FTIR, SEM and XRD show that CDC is grafted onto Fe(3)O(4) nanoparticles. The grafted CDC on the Fe(3)O(4) nanoparticles contributes to an enhancement of the adsorption capacity because of the strong abilities of CDCM, which includes the multiple hydroxyl, carboxyl groups, amino groups and the formation of an inclusion complex due to the β-CD molecules through host-guest interactions, to adsorb MB. The adsorption of MB onto CDCM is found to be dependent on pH and temperature. Adsorption equilibrium is achieved in 50 min and the adsorption kinetics of MB is found to follow a pseudo-second-order kinetic model. Equilibrium data for MB adsorption are fitted well by Langmuir isotherm model. The maximum adsorption capacity for MB is estimated to be 2.78 g/g at 30°C. The CDCM was stable and easily recovered. Moreover the adsorption capacity was about 90% of the initial saturation adsorption capacity after being used four times.
一种新型的纳米吸附剂，β-环糊精-壳聚糖（CDC）修饰的 Fe(3)O(4)纳米粒子（CDCM），通过将 CDC 接枝到磁铁矿表面，用于从水溶液中去除亚甲基蓝（MB）。FTIR、SEM 和 XRD 的特征结果表明，CDC 已接枝到 Fe(3)O(4)纳米粒子上。由于 CDCM 具有多个羟基、羧基、氨基以及通过主体-客体相互作用形成包含络合物的能力，因此接枝在 Fe(3)O(4)纳米粒子上的 CDC 有助于提高吸附能力，从而增强对 MB 的吸附能力。研究发现，MB 在 CDCM 上的吸附取决于 pH 值和温度。在 50 分钟内达到吸附平衡，MB 的吸附动力学符合准二级动力学模型。MB 吸附的平衡数据很好地符合 Langmuir 等温吸附模型。在 30°C 时，MB 的最大吸附容量估计为 2.78 g/g。CDCM 稳定且易于回收。此外，经过四次使用后，吸附容量约为初始饱和吸附容量的 90%。
