论文部分内容阅读
利用水热法制备了Fe3O4纳米粒子(Fe3O4NPs),并对其进行改性制备了改性聚合物Fe3O4MMPs.同时,利用X射线衍射(XRD)、扫描电镜(SEM)和紫外可见漫反射(DRS)等手段对所制备的材料进行表征.通过比表面积(BET)测定发现,Fe3O4MMPs的比表面积较Fe3O4NPs增大约9倍.在可见光照射下(λ>420 nm),以H2O2为氧化剂,比较研究了以Fe3O4NPs和Fe3O4MMPs为光催化剂降解罗丹明B(Rhodamine,RhB)的催化特性,并探讨了Fe3O4改性对催化活性的影响.结果表明,改性聚合物Fe3O4MMPs的稳定性增加,对底物RhB的降解活性提高,120 min时对RhB的脱色率在98%以上;此外,Fe3O4MMPs对水杨酸(Salicylic Acid,SA)也具有很好的降解效果.利用电子自旋共振技术(ESR)测定氧化物种的结果表明,降解过程涉及羟基自由基(·OH)和超氧自由基(·O-2)氧化机理.
Fe3O4 nanoparticles (Fe3O4NPs) were prepared by hydrothermal method, and modified Fe3O4MMPs were prepared by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet visible diffuse reflectance (DRS) The specific surface area of Fe3O4MMPs was increased by about 9 times as that of Fe3O4NPs by visible light irradiation (λ> 420 nm) and H2O2 as oxidant Fe3O4NPs and Fe3O4MMPs as photocatalysts to degrade Rhodamine B (RhB), and discussed the effect of Fe3O4 modification on the catalytic activity.The results showed that the stability of the modified polymer Fe3O4MMPs was increased and the degradation of RhB And the decoloration rate of RhB was over 98% at 120 min. In addition, Fe3O4MMPs also had good degradation effect on Salicylic Acid (SA). The electron emission spectrometry (ESR) The results showed that the degradation process involved · · OH and · O-2 oxidation mechanisms.