纳米磁性膨润土复合材料表征及降解甲基橙研究

以纯化膨润土为原料,通过铁盐与膨润土浆液反应制备非均相纳米磁改性Fe3O4/膨润土复合材料,研究其对甲基橙的降解性能。结果表明,纳米磁性颗粒以Fe3O4附载于膨润土上形成磁性集合体,其对甲基橙废水等温吸附符合Langmuir等温吸附模型。在pH为7、温度为25℃、纳米磁性膨润土投加量为1g/L、H2O2投加量为2.5mmol/L、降解时间为120min条件下,对模拟甲基橙废水降解率达96%,CODCr去除率为94.7%,色度去除率为88.8%。

Nano-magnetic modified bentonite:preparation and its degradation of methyl orange

Nano-magnetic modified bentonite(NMB) was prepared through a reaction between the iron salt solution and the dispersion solution of refined bentonite,and its degradation capability for methyl orange was investigated.The results show that Fe3O4 nanoparticles occur on the surface of bentonite particles and form magnetic aggregation,whose isothermal adsorption of methyl orange wastewater can be well fit to Langmuir model.Under the conditions of pH=7.0,T=25 ℃,ρ(NMB)=1.0 g/L,and ρ(H2O2)=2.5 mmol/L,the degradation rate of methyl orange reaches 96% at 120 min,and the removal rates of CODCr and discoloration are 94.7% and 88.8%,respectively.