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利用可溶性淀粉或壳聚糖作为碳源前驱体,以溶剂热法制备的磁性Fe_3O_4纳米颗粒在喷雾干燥原位包覆过程中镶嵌于不同的碳源前驱体中,制得Fe_3O_4@X复合材料(X为可溶性淀粉或壳聚糖)。不同的前驱体复合材料在氮气气氛保护下经不同的高温煅烧,得到不同的介孔Fe_3O_4@碳磁性复合材料。利用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)、超导量子干涉器磁强计(SQUID)、比表面积及孔径分布测定仪(BET)等手段对不同样品的形貌、结构、组分、磁性、比表面积和孔径分布进行了表征。结果表明,在煅烧温度为800℃条件下,以壳聚糖为碳源前躯体制备的Fe_3O_4@碳复合材料具有较好的比表面积、孔体积和孔径尺寸,并且这种复合材料对亚甲基蓝染料具有一定的吸附性能,在外磁场的作用下能进行有效的固液分离。
Using soluble starch or chitosan as precursor of carbon source, magnetic Fe_3O_4 nanoparticles prepared by solvothermal method were embedded in different carbon source precursors during the in situ coating by spray drying to obtain Fe_3O_4 @ X composite X is soluble starch or chitosan). Different precursor composites were calcined at different temperatures under the protection of nitrogen atmosphere to obtain different mesoporous Fe 3 O 4 @ carbon magnetic composites. The morphology of different samples was characterized by SEM, TEM, XRD, SQUID, BET, Appearance, structure, composition, magnetic properties, specific surface area and pore size distribution. The results show that Fe_3O_4 @ carbon composites prepared by using chitosan as a carbon source precursor have better specific surface area, pore volume and pore size at a calcination temperature of 800 ℃, and this composite has the following properties Certain adsorption properties, in the external magnetic field under the effect of effective solid-liquid separation.