文章摘要
赵缘园,张国权,杨凤林.CoFe2O4/CoFe2S4活化PMS性能及机理[J].,2021,61(6):557-568
CoFe2O4/CoFe2S4活化PMS性能及机理
Performance and mechanism of PMS activation by CoFe2O4/CoFe2S4
  
DOI：10.7511/dllgxb202106002
中文关键词: 过一硫酸盐  CoFe2S4  CoFe2O4  黄连素
英文关键词: peroxymonosulfate  CoFe2S4  CoFe2O4  berberine
基金项目:国家自然科学基金资助项目(21437001).
作者单位
赵缘园,张国权,杨凤林  
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中文摘要:
      通过简单的两步水热法合成CoFe2O4/CoFe2S4复合物．扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)及X射线光电子能谱(XPS)物性表征表明，CoFe2O4/CoFe2S4复合物由纳米片和纳米花颗粒混杂构成．与CoFe2O4相比，原位硫化引入轻微缺陷可以增加活性位点，从而促进CoFe2O4/CoFe2S4复合物的氧化还原活性，赋予CoFe2O4/CoFe2S4催化过一硫酸盐(PMS)体系更优异的氧化降解能力．进一步的参数优化实验表明，CoFe2O4/CoFe2S4与PMS体系氧化降解黄连素的最佳条件为1 mg/L CoFe2O4/CoFe2S4、0.8 mmol/L PMS、温度40 ℃、pH 7.0，该条件下黄连素的降解率在60 min内可达98.4%．CoFe2O4/CoFe2S4循环使用3次后，黄连素降解率依然在90%以上．电子顺磁共振(EPR)研究表明，CoFe2O4/CoFe2S4与PMS体系产生的主要活性氧化物种为SO-4和HO．自由基抑制实验证明，SO-4是降解黄连素的主要活性物种．
英文摘要:
      The CoFe2O4/CoFe2S4 composite is synthesized by a simple two step hydrothermal method. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X ray diffraction (XRD) and X ray photoelectron spectroscopy (XPS) characterization of physical properties show that the CoFe2O4/CoFe2S4 composite is composed of nanosheets and nanoflower particles. Compared with CoFe2O4, the introduction of slight defects by in situ vulcanization can increase the active sites, thereby promoting the redox activity of the CoFe2O4/CoFe2S4 composite, and giving the CoFe2O4/CoFe2S4 catalytic peroxymonosulfate (PMS) system a better oxidative degradation ability. Further parameter optimization experiments show that the optimal conditions for the oxidative degradation of berberine by the CoFe2O4/CoFe2S4 and PMS system are 1 mg/L CoFe2O4/CoFe2S4, 0.8 mmol/L PMS, temperature of 40 ℃, pH of 7.0. Under these conditions, the degradation rate of berberine can reach 98.4% within 60 min. After three cycles of CoFe2O4/CoFe2S4, the degradation rate of berberine is still above 90%. Electron paramagnetic resonance (EPR) studies show that the main active oxide species produced by the CoFe2O4/CoFe2S4 and PMS system are SO-4 and HO; free radical suppression experiments prove that SO-4 is the main active species that degrades berberine.
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