【摘要】 采用水热合成法将MnFe₂O₄和碳纳米管（CNT）结合形成催化剂复合材料,用于活化过硫酸盐降解四环素（TC）。采用X射线衍射仪（XRD）、扫描电镜（SEM）、振动样品磁强计（VSM）、比表面及孔隙度分析仪、X射线光电子能谱仪（XPS）等技术对复合材料进行表征。结果表明:MnFe₂O₄呈球状均匀地生长在CNT上,根据其原子占比将复合材料命名为Mn_0.02Fe_1.10O₂/CNT。制得的Mn_0.02Fe_1.10O₂/CNT具有较好的磁性能,比表面积达118.713 m²/g,为介孔材料。在TC初始质量浓度为40 mg/L,氧化剂过二硫酸盐（PDS）投加量为2 mmol/L,Mn_0.02Fe_1.10O₂/CNT投加量为0.3 g/L,20℃下反应90 min, TC去除率可达87.10%。可见,Mn_0.02Fe_1.10O₂/CNT对PDS具有较好的催化活性,可能是复合材料中的Fe²⁺和Fe³⁺参与了催化氧化反应,大量TC在Mn_0.02Fe_1.10O₂/CNT表面降解。更多还原

【Abstract】 The catalyst composite was prepared by hydrothermal synthesis method with MnFe₂O₄ and carbon nanotubes（CNT） as raw materials. The obtained catalyst composite was used to activate persulfate for tetracycline（TC） degradation. The composite was characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,vibrating sample magnetometer（VSM）,specific surface and porosity analyzer, X-ray photoelectron spectroscopy（XPS）,etc. Results showed that MnFe₂O₄ uniformly covered on CNT in spherical form and the composite material was named as Mn_0.02Fe_1.10O₂/CNT according to its atomic ratio. The prepared Mn_0.02Fe_1.10O₂/CNT had good magnetic properties and the specific surface area was 118.713 m²/g, belonging to mesoporous material. When peroxysulphate（PDS） was 2 mmol/L,Mn_0.02Fe_1.10O₂/CNT was 0.3 g/L,the temperature was 20 ℃,and the initial mass concentration of TC was 40 mg/L,the TC removal rate reached 87.10% after 90 min. It could be clearly seen that Mn_0.02Fe_1.10O₂/CNT exhibited a good catalytic activity for PDS. Fe²⁺ and Fe³⁺ in the composite might be involved in the catalytic oxidation reaction, and a large amount of TC was degraded on Mn_0.02Fe_1.10O₂/CNT surface.更多还原