【摘要】 采用共沉淀法制备了一种磁性Fe3O4/CNTs(碳纳米管复合物),采用XRD、SEM、VSM等对Fe3O4/CNTs复合材料的晶相、颗粒大小和磁性能进行了表征。以刚果红染料废水处理为例,研究了不同处理工艺、催化剂投加量、溶液p H、催化剂重复使用等因素对Fe3O4/CNTs材料光催化脱色刚果红染料废水效果的影响。结果表明,当刚果红染料起始质量浓度为10 mg/L,用量为0.2 g/L,3%的H2O20.2 m L,光照50 min后,Fe3O4/CNTs对刚果红溶液的脱色率达到97.0%。催化剂重复使用第4次,对刚果红染料的脱色率仍可达87%以上。此外,Fe3O4纳米粒子的存在使Fe3O4/CNTs材料具有较强的磁性,且可通过外加磁场将其从处理后的水体中快速分离回收。更多还原

【Abstract】 Magnetic Fe3O4/ carbon nanotubes( Fe3O4/ CNTs) composite was prepared with the co-precipitation method. Crystal phase,particle size and magnetic properties of Fe3O4/ CNTs composite materials were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM) and vibrating sample magnetometer( VSM).Taking Congo Red( CR) dye wastewater treatment as the example,the influence of different factors like treatment processes,photocatalyst dosage,p H and the reuse of photocatalyst on the effectiveness of photocatalytic removal of CR dye wastewater using Fe3O4/ CNTs was studied. The results indicate that 97% of CR solution was successfully decolorized after 50 min under simulated solar light irradiation with 10 mg / L of initial CR concentration and0. 20 g / L of photocatalyst dosage and 0. 2 m L of 3% H2O2. Over 87% of CR solution( 10 mg / L) can be decolorized after the photocatalyst being used for four cycles. In addition to that, the existence of Fe3O4 nanoparticles makes Fe3O4/ CNTs material have strong magnetism,which means it can be separated easily from treated aqueous by adding magnetic field.更多还原