Preparation of PEI Functionalized Magnetic Carbon Nanotubes and Their Adsorption of Fucoidan
A polyethyleneimine-coated carbon nanotube-loaded Fe3O4 composite(PEI-CNTs@Fe3O4)was prepared by polyol method using carbon nanotubes and iron acetylacetonate,which was used in fucoidan adsorption studies.The study found that the composite adsor-bent 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@Fe3O4 was more in line with the pseudo-second-order reaction kinetics and Langmuir isotherm adsorption model,the results were more inclined to monolayer chemi-sorption.Thermodynamic data show that the adsorption reaction was an endothermic reac-tion.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@Fe3O4 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.
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