【作者】 陈鹏；

【导师】 曲虹霞；

【作者基本信息】 南京理工大学 ， 化学工程（专业学位）， 2017， 硕士

【摘要】 有机染料是重要的水资源污染物之一,近年来尖晶石类复合光催化剂由于其优越的光催化降解有机染料的性能得到广泛的研究。本文采用水热法分别制备了 CuFe₂O₄/GO以及CuFe₂O₄/MgFe₂O₄复合材料。该制备方法较为简单有效,且环境友好,易于操作。通过X射线衍射光谱（XRD）、X射线能谱仪（EDS）、透射电镜（TEM）、傅里叶变换红外光谱仪（FT-IR）、X射线光电子能谱（XPS）等分析测试的方法对催化剂的结构形貌及性质作了研究。通过催化剂的透射电镜图看出CuFe₂O₄/GO的形貌为CuFe₂O₄纳米微粒均匀分散在GO表面,CuFe₂O₄/MgFe₂O₄的形貌为空心微球。对于不同条件下两种复合材料催化降解AO7的性能进行了对比研究,CuFe₂O₄/GO和CuFe₂O₄/MgFe₂O₄在可见光条件下,两种复合催化剂对AO7都具有良好的催化降解活性。本文考察了催化剂的加入量、溶液的pH值、不同的光源、不同的染料如AO7的初始浓度以及不同含量组成比例的复合材料等对催化剂降解染料的性能的影响。本文对于两种复合催化剂的催化降解染料的机理作了探究,通过加入自由基猝灭剂后的催化效果对比研究发现两种复合催化剂中起着主导作用的自由基都是·O₂^-和h⁺。其中CuFe₂O₄/GO因为GO的良好导电性,以及其较大比表面积有效的增强了 CuFe₂O₄的光催化性能,而CuFe₂O₄与MgFe₂O₄复合形成了 PN异质结结构,有效的增强了光生电子的利用性从而增强了其的光催化性能。由于两种复合材料都具有良好的磁性,回收过程非常简单方便,对于两种复合材料的重复性实验发现两者都具有非常好的稳定性及循环利用性,由此可见两种催化剂都具有应用于实践的良好前景。更多还原

【Abstract】 Organic dyes are one of the important atmospheric pollutants.Recently,spinel composite photocatalyst has been widely studied because of their excellent photocatalytic activity in degrading organic dyes.In the study,CuFe₂O₄/GO and CuFe₂O₄/MgFe₂O₄ were synthesized by hydrothermal method and the method is environmental-friendly and very simple.The XRD,EDS,TEM,FT-IR.XPS and other characterization methods were used to characterize the structure and properties of the catalysts.The experiment results showed us that,the morphology of the CuFe₂O₄/GO was that CuFe₂O₄ nanoparticle dispersed on the surface of GO and CuFe₂O₄/MgFe₂O₄ were hollow microsphere.The specific surface area of the composite was effectively increased by two kinds of morphologies,which enhanced the activity of the catalysts.The composites have good photocatalytic activity in degrading AO7 under visible light irrigation,and the catalysts have different degradation efficiency under different condition such as catalyst dosage,solution pH value,different light source,the initial concentration of AO7,and different content of the two kinds of composite in the composition.At the same time,the mechanism of photocatalytic degradation of dye for two kinds of composite catalyst for research,through the comparison of the catalytic effect of adding free radical masking agent after two plays a leading role in the composite catalysts are ·O₂^- and h⁺.The CuFe₂O₄/GO because the conductivity of GO,and a large effective surface area to enhance the photocatalytic performance of the CuFe₂O₄,CuFe₂O₄ and MgFe₂O₄ formed a composite PN heterojunction structure,to enhance the utilization of photogenerated electrons to enhance the photocatalytic properties of composite materials.Since the two kinds of composites both have good magnetic properties,the recovery process is very simple and convenient.The experiments of two kinds of composites shows that both of the catalysts are stable and easy to be recycled,thus the two catalysts shows potential applications in organic dye water treatment.更多还原