摘要： 以纯化硅藻土为原料，采用共沉淀法沉积纳米Fe₃O₄（MNPs）到硅藻土表面，制得磁性硅藻土（MNPs@Dia）非均相Fenton催化剂。通过SEM、FTIR及XRD对催化剂进行表征，并通过构建非均相Fenton体系考察其催化活性。结果表明，MNPs能较好地负载于硅藻土上，MNPs@Dia相较于MNPs作为催化剂，在相同条件下刚果红的降解率提高了15%；当MNPs与硅藻土的质量比为1∶2时，120 min后刚果红脱色率达到98%。

关键词: 磁性硅藻土, 纳米Fe₃O₄, 非均相Fenton, 刚果红

Abstract: Using purified diatomite as raw materials,the magnetic diatomite heterogeneous Fenton catalyst has been synthesized successfully by co-precipitation method,depositing nano-Fe₃O₄ to the surface of diatomite,and character-ized by SEM,FTIR and XRD. And the catalytic activity of magnetic diatomite has been investigated by establishing heterogeneous Fenton oxidation system. The results show that the Fe₃O₄ nanoparticles can successfully be loaded on the surface of diatomite. Magnetic diatomite compared with Fe₃O₄ nanoparticles as catalyst,under the same conditions,the degradation rate of congo red is increased by 15%. When the mass ratio of Fe₃O₄ nanoparticles and diatomite is 1:2,the decolorization rate of congo red reaches 98% in 120 min.

Key words: magnetic diatomite, nano-Fe₃O₄, heterogeneous Fenton, congo red

中图分类号: 

• X703.1

• TQ424.22