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采用悬浮聚合法制备了巯基功能化纳米Fe3O4-高分子磁性复合材料(SH-nFe3O4-polymer)。通过TGA、EA、AAS、XRD、FTIR、TEM、VSM等手段对合成的SH-nFe3O4-polymer进行了组成、结构、形貌、磁性等表征,并研究了其吸附和去除水中亚甲基蓝(MB)染料的性能。结果表明:合成的SH-nFe3O4-polymer平均粒径为250~300nm,饱和磁化强度为5.88emu/g;SH-nFe3O4-polymer对MB的等温吸附线符合Langmuir模型,饱和吸附量为476.2mg/g,高于四乙烯五胺功能化纳米Fe3O4-高分子磁性复合材料(TEPA-nFe3O4-polymer,30.6mg/g)和不含磁核的巯基功能高分子材料(SH-polymer,74.6mg/g)。吸附热力学研究表明,SH-nFe3O4-polymer对MB的吸附过程是自发的吸热熵增过程;吸附动力学研究表明,吸附过程可在10min内达到平衡,符合准二级动力学模型;其吸附过程的活化能为9.53kJ/mol。SH-nFe3O4-polymer能有效去除水中的MB,其对MB的吸附机理涉及静电相互作用、π-π相互作用和疏水相互作用;磁核的存在可以形成微电场,有利于加速吸附过程的传质,确保吸附过程快速有效地进行。
The sulfhydryl functionalized Fe3O4-polymer magnetic composites (SH-nFe3O4-polymer) were prepared by suspension polymerization. The composition, structure, morphology and magnetism of the synthesized SH-nFe3O4-polymer were characterized by means of TGA, EA, AAS, XRD, FTIR, TEM and VSM. The adsorption and removal of methylene blue (MB) Performance. The results showed that the average particle diameter of synthesized SH-nFe3O4-polymer was 250-300 nm and the saturation magnetization was 5.88 emu / g. The adsorption isotherm of SH-nFe3O4-polymer to MB was in accordance with the Langmuir model. The saturated adsorption capacity was 476.2 mg / g , Which is higher than that of TEPA-nFe3O4-polymer (30.6 mg / g) and SH-polymer (74.6 mg / g) . Adsorption thermodynamics studies show that the adsorption process of MB on SH-nFe3O4-polymer is a spontaneous endothermic entropy increase process; adsorption kinetics studies show that the adsorption process can reach equilibrium within 10min, in line with the quasi-second-order kinetic model; the adsorption process The activation energy is 9.53 kJ / mol. SH-nFe3O4-polymer can effectively remove MB in water, its adsorption mechanism on MB involves electrostatic interaction, π-π interaction and hydrophobic interaction; the existence of magnetic core can form micro-electric field, which is good for accelerating the mass transfer of adsorption process , To ensure that the adsorption process carried out quickly and effectively.