Study On The Surface And Interface Structure Regulation Of Bismuth Bromide And Its Photocatalytic Degradation Of Tetracycline Hydrochloride Wastewater

Water quality and safety are crucial to the ecological environment,social development and ecological sensitivity,while the widespread use and continuous discharge of antibiotics have caused serious water pollution.Antibiotics widely exist in fresh water,drinking water and reservoirs.As the water polluted by antibiotics poses a serious threat to human health and ecological environment,this pollution has become a common phenomenon and challenge in the global water ecosystem.Therefore,the study of antibiotic degradation in the water environment is becoming more and more important.Photocatalytic technology and persulfate advanced oxidation technology are widely used to degrade these pollutants due to their high efficiency and low pollution.At present,the surface/interface structure control of catalysts is considered to be the most effective way to improve the activity of catalysts.Bismuth-based materials have attracted more and more attention because of their suitable energy band structure and attractive physical and chemical properties.Especially,bismuth-based materials have layered crystal structure,and their surface and interface structures are easier to control.In this paper,the photocatalytic performance of bismuth photocatalyst has been effectively improved by regulating the surface/interface of semiconductor BiOBr,and its activation of peroxydisulfate has been discussed.The specific contents are as follows:1)BiOBr photocatalyst materials with adjustable proportion of {001} and {102}crystal planes were synthesized by ionic liquid spontaneous combustion method.The photocatalytic experiment shows that the BiOBr sample with {001}/{102} crystal plane ratio of 0.57 has the highest photocatalytic activity to degrade TC-HCL under visible light,which reveals that the increase of {001} crystal plane ratio can effectively improve the redox performance.At the same time,the controllable introduction of oxygen vacancies is realized by constructing a reducing atmosphere.The photoelectrochemical test results show that the synergistic effect of crystal surface and oxygen vacancy improves the charge separation.2)The Vis/BiOBr/PDS system was constructed by integrating photocatalysis and persulfate(PDS)oxidation technology to further improve the degradation performance.Vis/BiOBr/PDS system degraded 82% of TC-HCL in 90 minutes,and the degradation followed PDSeudo-second order kinetics.The photoelectrochemical test results show that PDS plays an electron capture role in the process of photocatalytic degradation.The catalytically active species of the system were investigated by the capture agent experiment and the possible reaction mechanism was proposed.The catalytic capacity of the Vis/BiOBr/PDS system was studied by the PDS dosage,pollutant concentration,different pollutants,temperature and other variables.In the three cycle experiments,the system showed excellent stability and repeatability.