Study On Properties Of Three-dimensional Particle Electrode Photoelectrocatalysis

The three-dimensional electrode photoelectric catalytic system that combineswith three-dimensional electrode and photochemical catalysis has very good degrad-ation of pollutants. The experiment filled particle electrode into photoelectrocataly-sis system to constitute three-dimensional particle electrode photoelectric catalyticsystem, studied on two kinds of three-dimensional particle electrode photoelectroc-atalysis system that as the TiO₂/zeolite and TiO₂/vermiculite forparticle electrode,and investigated photoelectric catalytic efficiency of the two systems.The particles electrodes of TiO₂/zeolite and TiO₂/vermiculite were obtainedrespectively by sol-gel method, mixed a certain proportion of TiO₂/zeolite （40-60mesh）and GAC（40-60mesh） to constitute complex particle electrode, used the same areatitanium nets as central electrode of photoelectrocatalysis system, the UV light as lightsource, sodium solution as electrolyte, methylene blue（MB） solution as targetdegradants, to constitute three-dimensional electrode catalyst system. And carried outthe experiment of MB degradation in self-made reactor.The experiment researched about particle ratio, plus partial voltage, the initialconcentration of MB, pH value, electrolyte concentration and other conditions on thedegradation efficiency to MB. The experiment shows that the best conditions ofTiO₂/zeolite and GAC system is the intial concentration of MB for3mg/L, pH=6.0,voltage for2.0V, electrolyte concentration for0.04mol/L, light distance for10cm,electrode gap for4.0cm, TiO₂/zeolite: activated carbon=2:3, aeration, the degradationrate comes to53.34%. To TiO₂/vermiculite and GAC system, when the intialconcentration of MB is3mg/L, pH=6.0, voltage for2.0V, electrolyte concentration for0.04mol/L,light distance10cm, electrode gap4.0cm, TiO₂/zeolite:activated carbon=2:3,aeration, photoelectric catalytic effect is best, the degradation rate of MB comes to 59.12%. The contrast experiment of three-dimensional photoelectrocatalysis system,two-dimensional photoelectrocatalysis system and Photocatalytic system were carriedout, the results show: to TiO₂/zeolite and GAC system, the degradation rate of MB is49.5%,23.4%,20.5%; to TiO₂/vermiculite and GAC system, the degradation rate ofMB is54.6%、25.4%、21.2%.Doping V⁵⁺, Mn²⁺, Cr³⁺, Fe³⁺, Co²⁺, Ni²⁺, Cu²⁺, Ag⁺in preparation of TiO₂particle electrode to modify it. The experiment shows that doping different ionor the same ion but different doped concentration has different effects on photo-electric catalytic performance. Doping Fe³⁺, V4+on particle electrode can improvephotoelectric catalyst efficiency of three-dimensional particle electrode photoelec-tric catalytic system, but doping Co²⁺, Cu²⁺reduces the photoelectric catalyst efficiency. Doping Sm, Y, Eu, Ce, Gd, La in preparation of TiO₂/vermiculite particleelectrode, the results show that the MB degradation rate comes to56.4%afterdoping Eu ion and just46.7%after doping Y.