Synthesis Of Bismuth Molybdate-based Photocatalyst And Study On Visible Light Degradation Performance Of Tetracycline Hydrochloride

Bismuth molybdate（Bi₂Mo O₆）,as a typical ternary oxide with excellent photoelectric properties,is also a member of the Aurvillius family,because of its good economy,stable chemical inertness,unique layered structure and suitable The energy band structure,non-toxic,environmentally friendly and other outstanding characteristics have attracted wide attention from scientific researchers.In recent years,a large number of scientific researchers have studied the degradation of pollutants driven by visible light.A single Bi₂Mo O₆is limited by its own carrier transport efficiency and transport channels,resulting in not very high catalytic efficiency,which also restricts its application.In this case,the situation between the interfaces appears more prominent,which can be adjusted Achieve efficient charge transfer between interfaces.The main research in this paper is Bi₂Mo O₆,and the design modification of bismuth molybdate synthesized by a single alcohol thermal method is carried out in order to obtain a photocatalyst with better performance.The main research contents are as follows:（1）As a structure directing agent,urea participates in the reaction to accelerate the transformation of Bi₂Mo O₆from nanoparticles to nanosheets,reduces the band gap width of the initial sample,and expands the visible light response range.By controlling the amount of urea added as a variable,a Bi₂Mo O₆photocatalyst with more active sites was synthesized.Under visible light,the degradation rate was significantly higher than that of Bi₂Mo O₆synthesized without urea.UV-vis showed the band gap of the modified sample The width becomes narrower,which means that the light absorption range becomes wider,that is,the response to visible light is stronger.In addition,electrochemical tests have also revealed this phenomenon,and the separation efficiency of photo-generated carriers has been improved.In the degradation experiment,the degradation efficiency of the best sample BMO-3 on TC reached 1.5 times that of the original Bi₂Mo O₆.（2）In order to further optimize the internal energy band structure of the Bi₂Mo O₆ photocatalyst and enhance the effective separation of electron-hole pairs and achieve a faster degradation effect,a low-cost composite photocatalyst Bi₂Mo O₆/g-C₃N₄was constructed using the impregnation method.Among them,g-C₃N₄is obtained by ultrasonic peeling and assembly of g-C₃N₄prepared by thermal polycondensation under the condition of isopropanol as a solvent.The composite photocatalyst degrades TC at the same degradation time and under visible light.The efficiency of degrading TC is significantly faster than that of a single Bi₂Mo O₆sample.The construction of a heterojunction system enhances the interaction between the two interfaces and forms a potential difference inside the semiconductor.The electron-hole migration movement achieves an effective electron-hole separation effect.The good internal band structure of Bi₂Mo O₆/g-C₃N₄and the morphology with more active sites help to improve the degradation efficiency of TC under visible light.Compared with the original Bi₂Mo O₆,the degradation rate of the degradation effect is only 75%.The best-performing sample,BC-30,has a degradation rate of 81.3%for TC under visible light.Figure[24]Table[4]Reference[105]...