Synthesis Of BiOCI Composites And Photocatalytic Degradation Performances Of Tetracycline Hydrochloride

In recent years,environmental pollution has seriously harmed human life and sustainable development of social economy,and become a global concern.Photocatalytic technology can effectively and rapidly degrade pollutants（antibiotics）in water and mineralize pollutants into non-toxic inorganic small molecules,attracting the attention of researchers.Bi OCl is a promising bismuth based semiconductor with unique layered structure,good stability and simple preparation.However,Bi OCl’s own wide band gap（3.19～3.44 e V）and high electron-hole pair recombination rates make practical applications far from satisfactory.Taking Bi OCl as the research object and tetracycline hydrochloride（TC）as the pollutant model,this paper intends to improve the photocatalytic degradation performance of Bi OCl composite materials through different modification methods.The main research contents are as follows:1.First,MoO₂/Bi OCl composites（BOM-x,x=1,3,5,10）containing MoO₂ mass percentage of 1‰,3‰,5‰,10‰were synthesized by chemical precipitation method.The photoelectric performance of the test samples was tested by scanning and transmitting electron microscopy.After the catalyst MoO₂ was exposed to Bi OCl,the electron was captured by Bi OCl and accelerated the separation of the electron-hole pair.In the light of visible light,the composite samples showed the best performance,the degradation effect of the TC（10 mg/l）was 90.7%,while the degradation rate of pure sample Bi OCl and MoO₂ was44.9%and 2.7%respectively.The apparent rate constant k of degradation in bombe was 4.7times that of the pure Bi OCl.2.Zn-AgIn₅s₈ QDs was prepared by simple hydrothermal method,and 0.03,0.05 and0.10 g Zn-AgIn₅S₈ QDs were added in the preparation process of Bi OCl,respectively,to obtain a series of Zn-AgIn₅S₈ QDs/Bi OCl composites with different composite ratios（BOS-x,x=0.03,0.05,0.10）.Through the scanning electron microscope,we can see the Zn-AgIn₅S₈QDs load to the Bi OCl nanoparticle,and then the floral layered microspherical structure of the self-assembly form.In addition,the capture agent experiment shows that the Z-scheme heterojunctions formed between the Zn-AgIn₅s₈ QDs/Bi OCl.The optimal sample BOS-0.05photocatalytic material was 83.9%of the TC（20 mg/L）degradation,4.8 times the degradation efficiency of Bi OCl（The apparent rate constant k）.The main factors of photocatalytic performance enhancement:1)BOS-0.05 composite materials have a large ratio surface area（15.18 m²/g）,which is six times the total of pure Bi OCl（2.48 m²/g）.2)The interface effect between the Z type heterostructure between the composite materials is to promote the separation and migration of the light call load while preserving the high oxidation reduction potential.3.Firstly,a series of Co₃O₄/Bi OCl precursors were prepared by chemical precipitation method,and then Co₃O₄/Bi OCl composites（BOC-x,x=3,5,10）with the molar ratios of Co:Bi of 3,5 and 10%were obtained by calcination.Through the analysis of the samples of the diffuse reflection,the X-ray electron energy spectrum and the photoelectric test,the Co₃O₄/Bi OCl heterologous junction formation can accelerate the migration rate of the electron and reduce the efficiency of the electronic hole.In visible light,the optimal sample BOC-5 was 2.5 times higher than the degradation rate of the TC pollutant solution.On this basis,the BOC-5 activated sulfates response（PDS）,which reached 92.3%of the TC in the visible light,was 7.3 times the degradation rate of 18.3 times the degradation rate.In addition,the study of the efficiency of TC degradation was studied in the initial concentration environment of different PDS,the p H value of solution and the initial concentration of TC.The results show that the heterofluous formation formed between the Co₃O₄/Bi OCl can improve the separation and transfer of the electronic hole,and the active material of the ultraliper free free free radicals is greatly improved to improve the degradation efficiency of TC pollutants.