Based On Ti-MOFs Composite Visible Light Photocatalyst Preparation And Performance Study

Today's excessive use of energy will lead to the advance of the energy crisis when it comes to energy.Also,the production of clean energy is a pressing matter of the moment,and the photodecomposition of water is an important means to solve the problem of energy conversion.Referring to agriculture,we can't ignore the effects of pesticides to our environment as well.Especially,in pesticide,one of the most difficult degradation pesticide ingredients is chlorine phenol.And because of the chlorinephenol's relatively stable chemical and physical properties,in the system of water,soil and atmosphere,chlorophenol is generally stable,it can affect the water sources and vegetation,etc.Furthermore,it can enter human body through the food chain for enrichment.Therefore,the removal and conversion treatment of chlorophenols is extremely urgent.Titanium fund belongs to organic composite frame structure in this paper with Ti-MOFs have an open structure,the existence of Ti³⁺,porosity,etc.,and other functional properties of the photocatalyst can narrow the forbidden band width of photocatalysts.It is easier to generate the photo-generate electron,so as to improve the utilization efficiency of light absorption of composite photocatalyst.This kind of catalyst can effectively solve the problem of clean production and degradation of the chlorinephenolic contaminants in the wastewater.In this paper,two kinds of Ti-MOFs photocatalysts with core shell structure are proposed.From the perspective of catalyst preparation,catalyst characterization,degradation performance and photocatalytic mechanism are described in detail.The following are the general contents:?1?Using solvent-thermal to prepare Ti-MOFs,the second step of solvent-thermal to prepare Ti-MOFs@Bi₂Mo O₆ photocatalyst heterojunctions.The Bi₂Mo O₆ package in the form of tiny particles on the Ti-MOFs,it can be shown that the Ti-MOFs@Bi₂Mo O₆in visible light have good corresponding.The degradation efficiency of 2,6-dichlorophenol and 2,4,5-trichlorophenol are 93.29%and 92.19%,respectively.The interpretation of the oxygen production efficiency is 171.3?mol g^-1 h^-1,it is 27.1 and 5.1times higher than pure Ti-MOFs and Bi₂Mo O₆.The formation of heterostructure makes the interface of the two catalysts closely connected,which is conducive to the exchange of electrons.Furthermore,Ti³⁺is produced by solvent-thermal reduction,it can effectively broaden the light response of the catalyst and shorten the band gap.?2?Furthermore,in order to improve photocatalytic performance of Ti-MOFs catalyst,this paper use three steps of high temperature and high pressure thermal-reaction to prepare the Ti-MOFs@Zn In₂S₄/Cd S tandem heterojunctions photocatalyst.Its special ternary structure can be effectively enrichment of electron in the middle of the components.And then,making electronic participation photocatalytic reduction reaction to produce clean energy,the activity of free radicals can also oxidation degradation of organic pollutants.After exploring the photocatalytic mechanism of tandem heterojunctions,the corresponding hypothesis is put forward and proved.The photocatalytic degradation efficiency of 2,6-dichlorophiol and 2,4,5-triclophenol reaches98.66%and 97.50%,and the efficiency of hydrogen production reaches 2.367 mmol g^-1h^-1,which was higher than that of conventional photocatalysts.