Graphene oxide has been functionalized with crown-ether moieties, while silica has been functionalized with stable free radicals of nitroxide type. These two materials and their mixture were firstly characterized by IR, ESR, SEM, and Raman spectroscopy, and secondly tested further for removal of some organic and inorganic pollutants from water, like benzyl alcohol, methylene blue dye, iron (II), and copper (II) ions. It is well known that graphene oxide, as well as crown-ether compounds, has a high capacity to bind transition metal ions, whereas nitroxide free radicals are able to oxidize, under certain conditions, organic compounds. Consequently, our experiments evaluated these materials and showed that they may act synergistically in order to simultaneously remove metal ions and organic pollutants.

氧化石墨烯已被冠醚部分官能化，而二氧化硅已被稳定的一氧化氮类型自由基官能化。这两种材料及其混合物首先通过IR，ESR，SEM和拉曼光谱进行了表征，其次进一步测试了从水中去除某些有机和无机污染物的能力，例如苯甲醇，亚甲基蓝染料，铁（II）和铜（II）离子。众所周知，氧化石墨烯以及冠醚化合物具有高的结合过渡金属离子的能力，而氮氧化物自由基能够在某些条件下氧化有机化合物。因此，我们的实验评估了这些材料，并表明它们可以协同作用以同时去除金属离子和有机污染物。