PEI功能化磁性碳纳米管的制备及其对岩藻多糖的吸附

Preparation of PEI Functionalized Magnetic Carbon Nanotubes and Their Adsorption of Fucoidan

以碳纳米管和乙酰丙酮铁为原料,采用多元醇法制备聚乙烯亚胺包覆的碳纳米管负载Fe_(3)O_(4)的复合材料(PEI-CNTs@Fe_(3)O_(4)),并用于岩藻多糖的吸附研究。研究发现,PEI-CNTs@Fe_(3)O_(4)吸附剂可有效吸附岩藻多糖,反应30 min即可达到吸附平衡。对其吸附机理研究表明:岩藻多糖在PEI-CNTs@Fe_(3)O_(4)吸附剂表面的吸附更加符合准二阶反应动力学和Langmuir等温吸附模型,结果更倾向于单层化学吸附,且热力学数据表明该吸附反应为吸热反应,在298、308和318 K的温度下其最大吸附量分别可达405.6、415.7和433.0 mg·g^(-1)。在经过3次循环再用的情况下,PEI-CNTs@Fe_(3)O_(4)对于岩藻多糖的吸附效果依然保持在80%以上。

A polyethyleneimine-coated carbon nanotube-loaded Fe_(3)O_(4)composite(PEI-CNTs@Fe_(3)O_(4))was prepared by polyol method using carbon nanotubes and iron acetylacetonate,which was used in fucoidan adsorption studies.The study found that the composite adsorbent can adsorb fucoidan effectively,which can be reached the adsorption equilibrium within 30 min.The study of the adsorption mechanism showed that:The fucoidan adsorption of PEI-CNTs@Fe_(3)O_(4)was more in line with the pseudo-second-order reaction kinetics and Langmuir isotherm adsorption model,the results were more inclined to monolayer chemisorption.Thermodynamic data show that the adsorption reaction was an endothermic reaction.At the temperature of 298,308 and 318 K,the maximum adsorption capacity can reach 405.6,415.8 and 433.0 mg·g^(-1),respectively.The adsorption effect of PEI-CNTs@Fe_(3)O_(4)adsorbent on fucoidan remained above 80%after three recycling cycles.The new composite material was expected to be widely used in the field of adsorption due to its green and effi-cient adsorption properties.