纳米Fe_3O_4类酶催化Na_2S_2O_8氧化降解对硝基酚

Degradation of p-Nitrophenol with Na_2S_2O_8 activated by peroxidase-like Fe_3O_4 magnetic nanoparticles

采用超声辅助反向共沉淀法制备了高活性的Fe3O4磁性纳米颗粒(Fe3O4MNPs).采用XRD,FT-IR和Raman等仪器对Fe3O4MNPs的组成、结构进行了表征和研究.以Fe3O4MNPs为类酶催化剂,Na2S2O8为氧化剂,在室温25℃的条件下,降解对硝基酚的优化条件为:10 mg.L-1对硝基酚溶液,在pH=3.8,Fe3O4MNPs用量为0.9 g.L-1,Na2S2O8用量为6.3 mmol.L-1时,无需超声、紫外光照和Gamma辐射的条件下,30 min后其降解率达到97%以上.

Fe3O4 magnetic nanoparticles（Fe3O4 MNPs） with highly-efficient were successfully prepared through an advanced reverse co-precipitation method under the assistance of ultrasound irradiation.The structure and morphology were characterized by X-ray powder diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR） and Raman spectroscopy.Removal of p-Nitrophenol（p-NP） pollutant was investigated by using Na2S2O8 as an oxidant and Fe3O4 magnetic nanoparticles（MNPs） as a peroxidase mimetic in a wide pH range from 2.0 to 10.0 at 25 ℃.It was found that Na2S2O8（6.3 mmol·L-1） was activated by 0.9 g·L-1 Fe3O4 MNPs at pH 3.8 and removing of 10 mg·L-1 p-NP was above 97% in 30 min,without heat or ultrasound-assisted or UV or Gamma irradiation.