多孔磁性Ag掺杂MnFe2O4材料的制备与其降解聚乙烯醇织物废水的性能研究

Preparation of porous magnetic Ag-doped MnFe2O4 and its performance in degradation of polyvinyl alcohol fabric wastewater

采用溶胶-凝胶法制备了Ag掺杂MnFe2O4材料,并考察了以其为催化剂催化过氧化氢降解聚乙烯醇模拟废液的效果。采用X射线衍射(XRD)、扫描式电子显微镜(SEM)、能量色散X射线(EDS)、比表面积测试(BET)、傅里叶红外光谱(FT-IR)、磁滞回线(VSM)等检测方法对Ag掺杂MnFe2O4颗粒进行表征。实验表明,采用溶胶-凝胶法合成的Ag掺杂MnFe2O4催化剂,产生了具有良好磁性的高度多孔结构。通过XRD和SEM分析发现,Ag进入催化剂中,并且掺杂了Ag的材料能将更多的催化过氧化氢转变为羟基自由基。此外,通过吡啶红外法发现,0.6%Ag添加量的催化剂所产生的路易斯位点最多,可以说明其表面的羟基含量,从而体现催化剂与双氧水产生的羟基自由基的含量。通过VSM测定发现,催化剂属于软磁材料系列,并且随着Ag含量的增加,催化剂的饱和磁强会略微下降,但是其磁性都仍可以满足回收的需要,对织物废水的处理具有现实意义和经济意义。

The Ag-doped MnFe2O4 material was prepared by sol-gel method,and the effect of the catalyst on the degradation of polyvinyl alcohol simulated waste liquid by hydrogen peroxide was investigated.The detection method such as X-ray diffraction(XRD),scanning electronic microscopy equipped with an energy dispersive X-ray spectrometer(SEM-EDS),fourier transform infrared spectroscopy(FT-IR),vibrating sample magnetometer(VSM).was used to characterize Ag-doped MnFe2O4 particles.The test shown that the Ag-doped MnFe2O4 catalyst synthesized by the solgel method produced a highly porous structure with good magnetic properties.It was found by XRD and SEM that Ag entered the catalyst,and it was found through experiments that the Ag-doped material can convert more catalytic hydrogen peroxide into hydroxyl radicals.In addition,it was found by pyridine infrared method that the catalyst with0.6% Ag addition produced the most Lewis sites,which can explain the hydroxyl content of the surface,thereby reflecting the content of hydroxyl radicals generated by the catalyst and hydrogen peroxide.The catalyst was found to be a series of soft magnetic materials by VSM measurement,and as the content of Ag increased,the saturation magnetic strength of the catalyst decreased slightly,but its magnetic properties could still meet the needs of recycling.