The Preparation Of Iron Based Metal Organic Compounds MIL-53 And Carbon Complexes And Their Applications In Photocatalysis

General secretary Xi Jinping has made an in-depth discussion on environmental issues,especially water pollution in the 19th National Congress.It can be seen that China's environmental problem is a major concern of our country and an urgent problem to be solved in the environmental field,especially the control and solution of water pollution.With the characteristics of green,energy saving,economic,environmental protection and other characteristics of photocatalytic technology in the treatment of water pollution,the effect is pleasant.The research on this technology is divided into two parts:One is to modify the traditional photocatalytic materials,such as TiO2,SnO2 and ZnO,and the other is looking for a new semiconductor photocatalyst which can respond to visiable light,including some oxide,sulfide and the metal organic compounds?MOFs?materials etc.As for the MIL-53?Fe?of MOFs materials,due to its small size effect of Fe?III?oxidation groups,It has been favored by more and more experts and scholars for reducing the photoelectron hole pair and improving the photocatalytic performance of the material.In this paper,the purpose is to combine with different carbon based compounds by MIL-53?Fe?,and structure on the formation of the composite materials were optimized,characterized by a variety of means to explore the influence factors of the photocatalytic properties,the reasons for the promotion of photocatalytic performance are briefly analyzed from the mechanism level.The main research content of this paper can be divided into three parts:1.M53/g-C₃N₄ which the g-C₃N₄ attached to the positive octahedral MIL-53?Fe?surface is prepared via a reaction-free process by controlling the proportion of reactants.Sheet type g-C3N4,which has better photocatalytic performance,is separated by ultrasonic.Then,M53/g-C₃N₄ was optimized by adjusting the proportion of M53 and g-C₃N₄,and found that M53/3%-g-C₃N₄ exhibits higher photocatalytic degradattion rate of 88%in160min for potassium dichromate,25%higher than the pure MIL-53?Fe?at the same irradiation time.2.A series of M53/RGO is prepared via a solvent thermal reaction by adjusting the proportion of M53 and RGO.Due to RGO,a large number of carriers can be effectively transferred in the process of photocatalysis,resulting in a long and effective electron-hole separation.Different degree of separation of M53/RGO with different proportions of M53/RGO has different photocatalytic performance.Among them,the M53/0.5%-RGO exhibits higher photocatalytic degradattion rate of 92%in 100min for potassium dichromate.3.M53/MWCNTs complex can be prepared by adding MWCNTs in the MIL-53?Fe?precursor.Due to MWCNTs,the electron in conduct band can be effectively captured to MWCNTs to improve the photocatalytic performance of MIL-53?Fe?.The photocatalytic degradation of potassium dichromate?K₂Cr₂O₇?in the M53/MWCNTs complex reached95%in 100 min.