Preparation Of MnFe₂O₄/ Carbon Nanocomposites And Their Fenton-like Catalytic Properties

Organic wastewater is not easy to decompose under natural conditions,and it is difficult for common water treatment technologies to degrade it completely.As a kind of advanced oxidation technology,Fenton-like technology has the characteristics of simple operation,mild treatment conditions,controllable reaction and outstanding oxidation ability to degrade organic wastewater into non-toxic and harmless substrates.Bimetallic oxide compounds have been widely studied as photo-Fenton catalysts,but suffer from the disadvantages of agglomeration and low degradation efficiency.In this thesis,carbon nanomaterials were introduced into the binary metal compounds to enhance the degradation ability by the strategy of reducing their agglomeration and providing more active sites.The main research is as follows:Mn Fe₂O₄prepared by both low-temperature precipitation and hydrothermal methods,and it is shown that the yield of Mn Fe₂O₄ prepared by low-temperature precipitation is relatively high and has a better degradation effect on rhodamine B.Mn Fe₂O₄/CNTs/GA materials were synthesized by a two-step method.It was shown that the Mn Fe₂O₄/CNTs/GA materials have larger specific surface area,faster electron transfer ability and exhibit excellent degradation performance compared with the single Mn Fe₂O₄ material.Three-dimensional Mn Fe₂O₄/BGA composites were prepared by hydrothermal and freeze-drying treatments.The active substances in the system were proved to be·OH and h⁺by free radical trapping experiments.