Study On Driving Fe(?)/Fe(?)Cycling By Photocatalytic To Active PS To Degrade Organic Pollutants

In the period of rapid development of new energy development and utilization,it is an effective way to increase the utilization rate and utilization efficiency of light energy.In this study,experiments have verified that photocatalysis can drive Fe cycling well and release sulfuric acid free radicals(SO4·-)by combining the activation of Fe2+with persulfate.At the same time,due to the interaction within the system,other active species(such as ·OH,·O2)will appear simultaneously.1.g-C3N4/ZnO and g-C3N4/Bi2O3 photocatalysts were prepared by recrystallization calcining,and the atomic morphology of crystalline chemical components of the photocatalyst was characterized and analyzed by XPS,EDS,XRD,TEM and SEM.2.The g-C3N4/ZnO/Fe(?)/PS system was constructed,and its reaction process was explored.It was determined that the Fe(?)/Fe(?)cycle could be driven by photocatalysis,and it was successfully applied to active PS to produce SO4·-.The effects of light intensity,amount of catalyst and partial anion on the degradation efficiency were investigated.The main active species were identified as SO4·-and OH by EPR,and a possible pathway for activating persulfate to release sulfuric acid free radicals by obtaining Fe2+ by photogenic electrons was proposed:The photoelectron reduction of Fe3+ produces Fe2+ and activates sodium persulfate efficiently.The resulting sulfuric acid free radical and hydroxyl free radical obtained from the hole jointly oxidize and degrade pollutants to improve the utilization rate of neutral energy.3.The construction of g-C3N4/Bi2O3/Fe(?)/PS system is mainly used to explore the impact of drug dosage,and the mathematical model of the impact of sodium persulfate and Fe(?)dosage on the degradation efficiency of g-C3N4/Bi2O3/Fe(?)/PS system is created,which can better guide the control of drug dosage.After 5 cycles,the g-C3N4/Bi2O3/Fe(?)/PS system was resolved to have good stability,and the degradation efficiency was maintained after repeated for many times.The main active species was identified as ·O2-by EPR,and a possible degradation pathway was proposed:the photogenic electron reduction of Fe3+ produced Fe2+ and activated sodium persulfate efficiently.The resulting sulfuric acid free radical and hydroxyl free radical obtained from the hole was converted into ·O2-,which was used as the main active species.Figure[30]table[3]reference[159]...