汞离子磁性吸附剂的制备及应用

Synthesis and application of magnetic adsorbent for mercury ions

采用化学接枝技术将功能单体罗丹明肼合物修饰于Fe_3O_4@SiO_2核壳纳米球上,制备出磁性吸附材料,并用于检测和除去水体中的汞离子.实验结果表明,所制备的磁性吸附剂对汞离子有很高的选择性,可选择性识别和富集环境水样中的汞离子,对汞离子的最大吸附容量为40.15μmol·g^(-1),且该吸附剂饱和磁化率达26.1 emu·g^(-1),可以通过磁铁实现在水体中的快速收集.此外,通过四丁基氢氧化铵溶液洗涤已吸附汞离子的吸附剂,还可以实现汞离子磁性吸附剂的再生和循环使用.

We developed an organic-inorganic hybrid material for selective removal of Hg^（2＋） ion from water,by immobilizing rhodamine derivative onto the surface of core / shell Fe3O4@SiO2 nanospheres（ Fe3O4@SiO2-R6G）. With a saturation magnetization of 26. 1 emu·g^（-1）,the Fe3O4@Si O2-R6 G could be simply re-collected from water by an external magnet within a few minutes. Moreover,the Fe3O4@SiO2-R6 G showed high selectivity for adsorbing Hg^（2＋）over other metal ions in aqueous solution. The maximum adsorption capacity for Hg^（2＋）was 40.15 μmol·g^（-1）. It could be easily recovered by treatment with a solution of tetrabutylammonium hydroxide and used repeatedly.