Sinha Arjyabaran, Jana Nikhil R
Centre for Advanced Materials, Indian Association for the Cultivation of Science, Kolkata-700032, India.
ACS Appl Mater Interfaces. 2015 May 13;7(18):9911-9. doi: 10.1021/acsami.5b02038. Epub 2015 May 1.
Microcystin-LR belongs to the family of microcystins produced by cyanobacteria and known to be the most toxic of this family. Existence of cyanobacteria in water bodies leads to the contamination of drinking water with microcystin-LR and thus their separation is essential for an advanced water purification system. Here we report functional nanocomposite-based selective separation of microcystin-LR from contaminated water. We have synthesized cyclodextrin-functionalized magnetic composite of colloidal graphene and porous silica where the cyclodextrin component offers host-guest interaction with microcystin-LR and the magnetic component offers easier separation of microcystin-LR from water. High surface area and large extent of chemical functional groups offer high loading (up to 18 wt %) of cyclodextrin with these nanocomposites, and the dispersible form of the nanocomposite offers easier accessibility of cyclodextrin to microcystin-LR. We have shown that microcystin-LR separation efficiency is significantly enhanced after functionalization with cyclodextrin, and among all the tested cyclodextrins, γ-cyclodextrin offers the best performance. We have also found that graphene-based nanocomposite offers better performance over porous silica-based nanocomposite due to better accessibility of cyclodextrins for interaction with microcystin-LR. The proposed graphene-based functional nanocomposite is environment friendly, reusable, and applicable for advanced water purification.
微囊藻毒素-LR属于蓝藻产生的微囊藻毒素家族，是该家族中毒性最强的。水体中蓝藻的存在导致饮用水被微囊藻毒素-LR污染，因此将它们分离对于先进的水净化系统至关重要。在此，我们报告了基于功能纳米复合材料从受污染水中选择性分离微囊藻毒素-LR的方法。我们合成了胶体石墨烯和多孔二氧化硅的环糊精功能化磁性复合材料，其中环糊精成分与微囊藻毒素-LR形成主客体相互作用，磁性成分便于从水中分离微囊藻毒素-LR。高比表面积和大量的化学官能团使这些纳米复合材料中环糊精的负载量很高（高达18 wt%），并且纳米复合材料的可分散形式使环糊精更容易与微囊藻毒素-LR接触。我们已经表明，用环糊精功能化后，微囊藻毒素-LR的分离效率显著提高，在所有测试的环糊精中，γ-环糊精表现最佳。我们还发现，基于石墨烯的纳米复合材料比基于多孔二氧化硅的纳米复合材料性能更好，因为环糊精与微囊藻毒素-LR相互作用的可及性更好。所提出的基于石墨烯的功能纳米复合材料环境友好、可重复使用，适用于先进的水净化。
