磁性Fe_3O_4/碳纳米管复合材料光催化处理刚果红染料废水

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。

Study on photocatalytic removal of Congo Red dye wastewater using magnetic Fe3O4/Carbon nanotubes composite

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, pH 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 and 0. 20 g/L of photocatalyst dosage and 0. 2 mL 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.