GO/Fe3O4/有机胺复合材料的制备及对结晶紫染料的吸附性能

用改进的Hummers法制备了氧化石墨烯,用乙二胺、乙二胺与丁二胺/己二胺混溶来改性氧化石墨烯。用水热法制备了Fe3O4,并用物理混合法制备了GO/Fe3O4/有机胺的三元复合体系。用透射电镜、扫描电镜、红外光谱、热重分析、X射线衍射、VSM和XPS等对所制得的样品进行了结构表征和性能测试,研究了三元复合粒子对结晶紫染料的吸附性能及影响结晶紫染料吸附效果的因素。结果表明:所制备的Fe3O4的平均粒径约为200 nm,粒径分布均匀;复合物中GO为典型的片状结构,GO及有机胺的掺杂没有影响Fe3O4的尖晶石结构;复合物为超顺磁性,Ms为53.0 emu·g~(-1)。吸附结果表明:石墨烯/Fe3O4/有机胺的三元复合材料对结晶紫染料的最大吸附量随浓度增大而增大,而吸附结晶紫染料的移除率却随结晶紫染料浓度增大而减小,并趋向一定值;乙二胺和己二胺混溶比例为5∶1的GO/Fe3O4复合材料吸附性能最佳:结晶紫浓度为400 mg·L~(-1),最大吸附量为164.3 mg·L~(-1)。

GO/Fe3O4/Organic Amine Composites: Preparation and Adsorption on Crystal Violet Dyes

Graphene oxide prepared by modified Hummers was modified by ethylenediamine, ethylenediamine and butanediamine/hexamethylenediamine miscibility. Fe₃O₄ was prepared by hydrothermal, and GO/Fe₃O₄/organic amine ternary complex system was prepared by physical mixing. The prepared samples were characterized by TEM, SEM, FT-IR, TG, XRD, VSM and XPS, the performance of ternary composite particles on the crystal violet dye adsorption was tested, and the adsorption properties of the ternary composite particles on the crystal violet dyes were studied. The results show that the prepared Fe₃O₄ have an average particle size of about 200 nm and a uniform particle size distribution; the graphene in the composite is a typical sheet-like structure; the doping of graphene and organic amine does not affect the spinel of Fe₃O₄ structure; the composite is superparamagnetic with M_s of 53.0 emu·g^-1. The results of adsorption showed that the maximum adsorption capacity of the ternary composite on the crystal violet dye increases with the increase of concentration, while the removal rate of crystal violet dye adsorption increases with the concentration of crystal violet dye decrease, and tend to a certain value. The best adsorption capacity of GO/Fe₃O₄ composites with 5:1 miscibility of ethylenediamine and hexamethylenediamine is:mass concentration of the crystal violet=400 mg·L^-1, maximum adsorption=164.3 mg·L^-1.