石墨烯/Fe3O4/ZnO磁性纳米催化材料的制备及其性能研究

Preparation and Properties of Graphene/Fe_3O_4/ZnO Magnetic Nano-catalysts

以石墨烯为助催化剂,借助水热法合成石墨烯/Fe_3O_4/Zn O磁性纳米复合光催化材料对Zn O改性。光催化降解测试显示复合材料对对硝基苯酚和罗丹明B降解率可分别达到95.7%和94.2%,重复试验3次后,降解率仍超过90%。对复合材料在光催化体系中磁性回收利用进行了研究,其饱和磁化强度为23.05 emu·g-1,并讨论了其光催化反应机理。

Modified ZnO photocatalytic composites can improve the catalytic efficiency of catalytic systems, photocatalytic is crucially important to solve the problem of environmental pollution. The magnetic photocatalytic nanomaterial graphene/Fe3O4/ZnO were synthesized via a hydrothermal route, in this case , ZnO and Graphene act as catalyst and carrier respectively. The as-prepared magnetic graphene/ Fe3O4/ZnO composite were applied as photocatalysis for the photocatalytic degradation of nitrophenol and Rhodamine B. The results indicate that the degradation rate reach 9 5 . 1% and 94. 2% , respectively, after composite photocatalyst repeated three times, the degradation rate was still more than 90% . Moreover, these magnetic graphene/Fe3O4/ZnO composite can be completely removed from the dispersion with the help of magnetic separation and reused with little or no loss of catalytic. The mechanism of composites catalysis systems were also discussed.