新型磁性离子交换吸附TiO_2@Fe_3O_4/聚吡咯树脂复合材料制备及其吸附性能

Preparation and adsorptive property of novel magnetic ion exchange adsorption TiO_2@Fe_3O_4/polypyrrole resin composites

首先采用溶胶-凝胶法制备TiO_2@Fe_3O_4核壳结构的磁性纳米粒子,然后与聚吡咯(PPy)采用原位聚合法制备TiO_2@Fe_3O_4/PPy磁性离子交换吸附剂。通过TEM、SEM对样品的形貌及粒径进行表征,用XRD表征分析物相,FTIR表征样品的表面性质,用VSM测定磁性能,由紫外-可见分光光度计测定吸光度,并对孔雀石绿溶液进行吸附性能测试。结果表明,PPy与TiO_2@Fe_3O_4纳米粒子复合后形貌未变,团聚现象明显改善,磁强度为5.384emu·g^(-1),具有超顺磁性。在pH=7,温度为298K条件下,用0.05g TiO_2@Fe_3O_4/PPy吸附剂对25mL 20mg·L^(-1)孔雀石绿溶液(MG)进行吸附,饱和吸附容量为312.50mg·g^(-1),且30min内去除率可达到99.1%。与活性炭相比较,TiO_2@Fe_3O_4/PPy磁性离子交换吸附树脂可以进行大面积动态交换与吸附,吸附性能优于活性炭。

TiO2@Fe3O4 magnetic nanoparticles with core-shell structure was prepared by sol-gel method,and then TiO2@Fe3O4/polypyrrole（PPy）magnetic ion exchange adsorption resin was prepared with PPy by chemical oxidation.The morphology and particle size of the samples were observed by TEM and SEM.The phase analysis was represented by XRD.The surface properties of the samples were represented by FTIR.VSM was used to determine the magnetic property.The absorbance could be represented by UV,and malachite green solution was used for the adsorption test.The results show that TiO2 @ Fe3O4/PPy composite nanoparticles which are superparamagnetic unchanged,agglomeration is obviously improved,the magnetic intensity is about 5.384emu·g-1.When 0.05 g TiO2@Fe3O4/PPy adsorbent is used to adsort 25 mL 20mg·L-1 malachite green solution（MG）at 298K in the solution with pH=7,the saturated adsorption capacity of TiO2@Fe3O4/PPy adsorbent can reach up to 312.50mg·g-1,and the removal rate of which can reach up to 99.1% within 30 min.Compared with the activated carbon,TiO2@Fe3O4/PPy magnetic ion exchange adsorption resin can undertake large area dynamic exchange and adsorption,which illustrates that its adsorption propertities are better than that of the activated carbon.