Characterizing The Photoelectric Synergistic Catalytic Degradation Properties Of The Ag/TiO₂/Mesoporous Material

A new kind of three dimensional particle electrodes photoelectric catalyst Ag/TiO2/MCM-41 was first successfully synthesized in this study.The photoelectric catalyst was applied to the photodegradation of organic compounds,which has great significance for purifying water environment and saving energy.Three dimensional particle electrodes photoelectric catalyst Ag-TiO2-MCM-41 was prepared by hydrolytic method.combined with silver mirror method.To use Xenon lamp as light source,DC stabilized power supply to provide bias voltage,corrosion resistant plate as plate electrode,Na2SO4 as the electrolyte,RhB(Rhodamine B)as the target degradation agent.The decomposition of RhB was studied in the self-assembly of three dimensional electrodes photoelectric catalytic reactor.Preparing the photoelectric catalyst material with different TiO2 loadings and different Ag doping content.Experimental results show that:when the Ti02 loading is 60%and the Ag doping content is 5%,the Ag-TiO2-MCM-41 particle electrodes prepared has the best photoelectric catalysis effect.The study regarding the photoelectric synergistic catalytic effect of TiO2-MCM-41 particle electrodes and Ag-TiO2-MCM-41 particle electrodes reflects they all proved good synergistic.The dynamics analysis of the degradation process can accord with the false first order reaction kinetics model.TEM,XRD,XPS,N2 adsorption-desorption are used to characterize Ag-TiO2-MCM-41 particle electrodes of its morphology,element,and structure.The results indicate that:Ag-Ti02-MCM-41 has successfully loaded TiO2and doped Ag,it still keep regular mesoporous channel,and the size of the pore rang from 3nm to 4nm.According to the results of the test of the photoelectric performance by DRS,PL etc,The light absorption ability of TiO2-MCM-41 doped by elemental Ag enhanced,and the recombination rate of the optical electronic-hole reduced.Investigating the influence of electrolyte concentration,applied voltage,initial pH value of solution,aeration rate,particle electrodes dosage,initial RhB concentration on photoelectric catalysis effect.The experimental results indicate that:when the electrolyte concentration is 0.03mol/L,the applied voltage is 10V,the initial pH value of solution is 3,the aeration rate is 20 mL/min,the particle electrodes dosage is 0.2g/L,the initial RhB concentration is 15mg/L,the photoelectric catalysis effect was the best.