Reparation Of BaTiO₃-based Nano-powder And Porous Block And Its Piezoelectric Photocatalytic Performance

Barium titanate(BaTiO3)is widely used in catalysis,piezoelectricity,ferroelectricity,thermoelectricity,etc.In recent years,studies have found that in photocatalysis,the catalytic activity of nano tetragonal phase barium titanate(T-BT)is higher than that of cubic phase barium titanate(C-BT);In piezoelectric catalysis,the unique piezoelectricity of T-BT makes it have piezoelectric catalytic performance.Due to the relatively excellent catalytic performance of T-BT,it is of great significance to design a stable process that can produce nano-sized T-BT in large quantities.However,the photogenerated electron-hole separation efficiency of T-BT itself is low.It is proposed that the performance can be improved by compounding with the precious metal Ag to prepare nanocomposites with good catalytic performance,and its photocatalytic and piezoelectric catalytic degradation performance and reaction mechanism will be studied.Considering recycle use,on the basis of powder catalysis,a porous block is prepared by compounding powder and organic polymer,and the piezoelectric photocatalytic performance and stability of the block are tested.The main research contents and results are as follows:1.The T-BT precursor is prepared by a rotary evaporation system,and then the precursor is calcined at a high temperature to obtain T-BT with good crystallinity;the T-BT is modified by the light deposition method,so that Ag nanoparticles grow on the polyhedral T-BT on the surface of T-BT/Ag is obtained.2.The photocatalytic performance of T-BT and T-BT/Ag was measured,and it was concluded that the degradation effect of T-BT/Ag was higher than that of T-BT and C-BT/Ag.Combined with the analysis of PL,EIS and UV-vis,it is speculated that the catalytic mechanism is:the synergy of the Schottky barrier and the SPR effect of Ag nanoparticles improves the catalytic performance of the material.3.A porous T-BT/Ag/PVDF block with a porosity of about 70%and a certain degradation performance was prepared.The simulation calculation shows that the piezoelectric potential of T-BT/Ag is higher than that of PVDF;T-BT/Ag The piezoelectric potential when attached to PVDF is higher than that of T-BT/Ag wrapped by PVDF;the piezoelectric potential generated by the combination of T-BT/Ag and PVDF is higher than that of a single individual.4.T-BT/Ag/PVDF has higher piezoelectric properties than T-BT/Ag and PVDF.The degradation efficiency of T-BT/Ag/PVDF after polarization is higher than that before polarization.The piezoelectric photocatalytic effect It is higher than pure piezoelectric catalysis and photocatalysis.After cyclic degradation,the degradation effect,block quality,and microscopic morphology of the porous block remain basically unchanged,and have reliable mechanical properties.Through the adjustment of the material structure and composition,the porous block with the synergistic effect of photocatalysis and piezoelectric catalysis has been prepared in the full text,which has reference value for the design of convenient and efficient catalytic devices.