Research On The Performance And Mechanism Of New Catalytic Materials For Degrading Dye Wastewater

Environmental pollution is a major problem that human beings are facing and need to solve urgently.It is urgent to find new clean energy and effective treatment technologies.Photocatalytic technology has good development potential in treating dye wastewater pollution,but many photocatalysts have low degradation efficiency by using solar energy.Therefore,a new and efficient photocatalytic material was developed in this paper.In addition,the degradation rate of dye wastewater was improved by improving the existing catalytic materials and treatment technologies.The main research contents of this paper are as follows:（1）A novel plasma chiral Ag@Ag₃PO₄-Na DC composite was synthesized by photoreduction and chiral induction.Compared with Ag@Ag₃PO₄,the catalytic degradation ability of Ag@Ag₃PO₄-Na DC is improved by 60%,which indicates that the introduction of chirality greatly improves the plasma resonance effect of silver nanoparticles under visible light,promotes the synergistic effect between silver nanoparticles and silver phosphate semiconductor,and effectively improves the photocatalytic degradation performance of silver phosphate for dyes.（2）The efficient photocatalyst Ag@Ag Br-Cit was successfully prepared by sodium citrate reduction and subsequent ligand exchange reaction.Compared with Ag@Ag Br,Ag@Ag Br-Cit has higher utilization rate of visible light.In the photocatalytic reaction,the electron-withdrawing substituent（-COOH）was introduced into the ligand,which affected the electron density around the center of Ag nanoparticles,and further affected the oxidation ability of Ag nanoparticles,thus enhancing the photocatalytic degradation activity of Ag@Ag Br-Cit for MO.（3）Using silicon nitride piezoelectric material as catalyst,coupling photocatalysis and piezoelectric catalysis enhanced the catalytic oxidation performance of silicon nitride.With rhodamine B as the target pollutant,the degradation efficiency of Rh B solution by silicon nitride under the condition of coupled piezoelectric catalysis and photocatalysis is the highest,which is 1.93 times and 7.43 times that of single piezoelectric catalysis and photocatalysis.（4）By capturing light energy and vibration energy,aluminum nitride is driven to degrade Rh B solution by photo-piezoelectric.Ultrasonic vibration is used to make the aluminum nitride piezoelectric material generate polarized charges,forming built-in electric field,promoting the generation and separation of free charges and photo-generated charges,thus generating more active oxygen（·OH,·O₂^-）,and improving the ability of aluminum nitride to synergistically catalyze and degrade Rh B.（5）Using boron carbide as catalyst,the catalytic degradation performance of boron carbide under different conditions（light,ultrasound and light-ultrasound）was investigated.With Rh B as dye,the activity of boron carbide under photo-ultrasonic double catalysis is 13.6%higher than the sum of photocatalytic and ultrasonic catalysis,and the reaction rate constant under photo-ultrasonic double catalysis is7.3x10^-3min^-1higher than the sum of photocatalytic and ultrasonic catalysis,which proves that the combination of ultrasonic catalysis and photocatalytic can further improve the catalytic activity of boron carbide.