负载CoFe2O4纳米粒子磁性纤维滤料的制备与表征

通过选择聚苯硫醚(PPS)、聚四氟乙烯(PTFE)、聚酰亚胺(P84)、玻纤、聚苯二甲酰苯二胺(芳砜纶)等5种袋式除尘器常用纤维针刺毡,利用共沉淀法将磁性铁酸钴纳米粒子负载到5种纤维滤料上得到磁性滤料,采用扫描电镜(SEM)、X射线衍射(XRD)、傅里叶红外光谱(FT-IR)等表征方法从滤料上纤维表面负载形貌、CoFe2O4结晶程度、表面官能团等方面分析比较5种不同滤料负载磁性铁酸钴纳米粒子的微观机理及性能差异,并用振动样品磁强计(VSM)测试5种不同磁性滤料的剩余磁化强度及矫顽力大小。结果表明,P84磁性滤料由于自身纤维具有较强极性官能团C=O、较大负载表面积等特点使得铁酸钴纳米粒子负载更加均匀、磁密度较其它纤维滤料要高,每克磁性P84滤料的剩余磁化强度及矫顽力分别为0.52×103 A·m2/kg和3 940.2 A/m,这对于磁性材料捕集微细颗粒物具有重要意义。

Preparation and characterization of different magnetic filter materials

By selecting PPS,PTFE,P84,glass fiber,aramid and other five types of bag filter commonly used fiber needle felt,magnetic ferrite nanoparticles wereloaded onto five kinds of fiber filter materials by coprecipitation method to obtain magnetic filter material.SEM,XRD,FT-IR,and other characterization methods were used to analyze the microscopic mechanism and performance difference of five different filter-loaded magnetic cobalt ferrite nanoparticles from the surface loading morphology of the filter material,the degree of crystallization of CoFe2O4 and the surface functional groups.The VSM testedthe residual magnetization and coercivity of five different magnetic media.The results show that P84 magnetic filter material hadmore polar functional groupC  O and larger load surface area,which madethe ferric cobalt nanoparticle load more uniform and magnetic density higher than other fiber filter materials.The residual magnetization and coercivity of the filter material were 0.52×103 A·m2/kg and 3 940.2 A/m,respectively.This is important for the magnetic material to capture fine particles.