Li Leilei, Luo Chuannan, Li Xiangjun, Duan Huimin, Wang Xiaojiao
Key Laboratory of Chemical Sensing & Analysis in Universities of Shando ng (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
Key Laboratory of Chemical Sensing & Analysis in Universities of Shando ng (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
Int J Biol Macromol. 2014 May;66:172-8. doi: 10.1016/j.ijbiomac.2014.02.031. Epub 2014 Feb 21.
Magnetic chitosan and graphene oxide-ionic liquid (MCGO-IL) composites as biodegradable biosorbents were synthesized by impregnating MCGO with ionic liquid. The characteristic results of FTIR, SEM, and XRD showed that MCGO-IL were successfully prepared with large surface area and good magnetic responsiveness. They were used for the removal of Cr(VI) from simulated wastewater with a fast solid-liquid separation in the presence of external magnetic field. The influence of various analytical parameters on the adsorption of Cr(VI) such as pH, contact time, and initial ion concentration were studied in detail. The adsorption followed a pseudo-second-order kinetics. The equilibrium adsorption was well-described by the Langmuir isotherm mode and the maximum adsorption capacity was 145.35 mg/g. The stronger intermolecular hydrogen bond between MCGO-IL and Cr(VI) and the hydroxyl and amine groups were believed to be the metal ion binding sites. Moreover, the MCGO-IL could be repeatedly used by simple treatment without obvious structure and performance degradation. The obtained results indicated that the impregnation of the room temperature IL significantly enhances the removal efficiency of Cr(VI). The MCGO-IL may be suitable materials in heavy metal ion pollution cleanup if they are synthesized in large scale and at low price in near future.
通过用离子液体浸渍磁性壳聚糖和氧化石墨烯 - 离子液体（MCGO - IL）复合材料来合成可生物降解的生物吸附剂。傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和X射线衍射（XRD）的表征结果表明，成功制备了具有大表面积和良好磁响应性的MCGO - IL。它们用于从模拟废水中去除Cr(VI)，在外部磁场存在下实现快速固液分离。详细研究了各种分析参数如pH值、接触时间和初始离子浓度对Cr(VI)吸附的影响。吸附遵循准二级动力学。平衡吸附符合朗缪尔等温线模型，最大吸附容量为145.35 mg/g。认为MCGO - IL与Cr(VI)之间较强的分子间氢键以及羟基和胺基是金属离子结合位点。此外，通过简单处理，MCGO - IL可以重复使用，且结构和性能无明显降解。所得结果表明，室温离子液体的浸渍显著提高了Cr(VI)的去除效率。如果在不久的将来能够大规模、低成本地合成，MCGO - IL可能是重金属离子污染清理的合适材料。
