Synthesis And Catalytic Performance Of SbMO₄（M=V,Nb） Semiconductor Materials

As the noval and efficient technology,ultrasonic catalysis and photocatalysis have been widely used in the treatment of organic pollutants and the production of hydrogen with photolysis water for its high efficiency and environmental protection.Due to their unique chemical properties and band structure,semiconductor catalysts are ideal materials for improving catalytic efficiency.The SbMO₄（V,Nb）material with antimony ilmenite structure has a unique crystal structure and interesting physical properties,which is widely used in many fields.In this study,the influence of synthesis conditions on SbVO₄ and SbNbO₄ morphology was explored.Moreover,it was applied to the field of sonocatalytic degradation for the first time.Then,the photocatalytic properties of SbVO₄ and SbNbO₄ were further improved by compounding other semiconductor materials.The research contents were as follows:（1）SbVO₄ nanoparticles with different crystal types were successfully prepared by low temperature water bath and hydrothermal method.The materials were characterized by XRD,SEM,XPS and DRS.The semiconductor material was applied to the acoustic catalytic degradation of quinoline blue.The influence of various parameters on degradation rate was studied.The ultrasonic catalytic degradation efficiency of quinoline blue by amorphous SbVO₄ nanoparticles reached to 98%.The possible ultrasonic catalytic mechanism of SbVO₄ was proposed.（2）CdS/SbVO₄ composites were synthesized by the two-step hydrothermal method.The material was analyzed by a range of characterization methods.Under visible light irradiation,the CdS/SbVO₄ composite molar ratio of 0.2:1 showed the best photocatalytic activity,and the efficiency was 4 times that of pure SbVO₄.The CdS/SbVO₄ composite photocatalyst promotes the separation of electrons and holes through the coupling of narrow bandgap materials,thereby enhancing the photocatalytic activity.The electron transfer mechanism and main active centers of the prepared samples were described according to the electrochemical test.Based on the free radical trapping experiment and the results of the ESR test,the photocatalytic mechanism was discussed.（3）SbNbO₄ nanomaterials with different morphologies were synthesized by adopting three different solvents,and their morphologies and elemental composition were analyzed by XRD,SEM,XPS,DRS and BET.Their adsorption properties were evaluated by heavy metal Cr（Ⅵ）solution.The acoustic catalytic performance of quinoline blue was evaluated,and the acoustic catalytic degradation performance was optimized by exploring the catalyst dosage,initial dye concentration,pH value of dye solution and ultrasonic power.Based on the free radical trapping experiment,the acoustic catalytic mechanism of SbNbO₄ was proposed.（4）A novel g-C₃N₄/SbNbO₄ composite catalyst was prepared by chemical impregnation.It was analyzed by a series of physical characterization.The prepared g-C₃N₄/SbNbO₄ photocatalyst has a higher photocatalytic activity for acid red A degradation and photohydrogen production than the uncomplexed SbNbO₄ catalyst.The factors affecting the degradation of photocatalytic performance were explored.In addition,the mechanism of photocatalytic reaction was discussed by electron spin resonance（ESR）.