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一步溶剂热法合成磁性壳聚糖微球及其对汞离子的吸附

DOI: 10.14062/j.issn.0454-5648.2015.08.17

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Abstract:

采用一步溶剂热法合成了磁性壳聚糖微球(Fe3O4@CS),并对所制备的样品进行了表征。结果表明Fe3O4@CS微球尺寸为220~250nm,比饱和磁化强度>38.5A.m2/kg,且随着壳聚糖含量的增加,样品的饱和磁化强度与单分散性降低。考察了Fe3O4@CS对Hg2+的吸附性能,结果显示,Fe3O4@CS对Hg2+的最大吸附量为0.83mmol/g,其对Hg2+的吸附能力归因于样品表面暴露的官能团的数量及单分散性的共同影响样品壳聚糖含量的增加,会增加表面的氨基和羟基的数量,有助于对Hg2+的吸附;反之样品壳聚糖含量增加,表面官能团电荷增多易团聚,又会降低对Hg2+的吸附。在动力学吸附实验中,样品在10min内即可达到吸附平衡,表明该吸附剂具有快速的吸附能力;同时可通过外加磁场对吸附剂进行分离,被吸附的Hg2+用乙二胺四乙酸二钠(EDTA-2Na)很容易被洗脱,因此该吸附剂具有良好的循环利用能力。

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