Preparation Of Activated Carbon Loaded Iron Oxide Particle Electrode By Microwave Method And Its Application To Treatment Of Ammonia Nitrogen Wastewater In Three-dimensional Electrochemical Oxidation

Under the global background of water shortages and serious water pollution,solving water pollution is the primary problem facing the survival and development of all mankind.With the development of industrialization,ammonia nitrogen pollution has become more and more serious.The discharge of untreated ammonia nitrogen wastewater into the environment will cause great damage to the ecological environment and human health.Therefore,further research on the rapid and efficient removal of ammonia nitrogen pollution in wastewater is of great significance.Three-dimensional electrochemical oxidation technology has obvious advantages of high efficiency and simplicity in the advanced treatment of ammonia nitrogen.However,the cumbersome synthesis method and poor catalytic performance of the three-dimensional particle electrode limit its further development.The activity and catalytic performance of single-particle electrodes can be improved by preparing composite particle electrodes.Iron oxide,as a material with excellent catalytic performance,is often used as a supporting component for research.Compared with the traditional particle electrode synthesis method,the microwave method has fast synthesis speed,high efficiency and energy saving and simple operation.Therefore,this article used microwave method to synthesize three-dimensional particle electrode with iron oxide as a supporting component in one step.And the synthetic particle electrode was used to perform three-dimensional electrochemical oxidation treatment on wastewater.The main work is as follows:1.Using powdered activated carbon as a substrate and and ferrous sulfate heptahydrate as the iron source,three-dimensional particle electrodes of iron oxide/powdered activated carbon（Fe₃O₄/PAC）were synthesized and characterized under microwave conditions.Explore the effect of particle electrode synthesis conditions,voltage,dosage and temperature on the removal rate of ammonia nitrogen.The results showed that the experimental conditions are:Fe₃O₄/PAC particle electrode synthesis conditions are PAC:FeSO₄=3:1,microwave power=1000 W,microwave time=60 s,particle electrode dosage=0.3 g,voltage=20 V and initial temperature=40℃,the maximum removal rate of ammonia nitrogen after 60 min of three-dimensional electrolysis is 78.25%,which is nearly 50%higher than that of the 2 D system（53.46%）.2.Using powdered activated carbon as a substrate and anhydrous ferric chloride as the iron source,three-dimensional particle electrodes of anhydrous ferric chloride/powdered activated carbon（α-Fe₂O₃/PAC）were synthesized and characterized under microwave conditions.Investigate the influence of voltage,particle electrode dosage and particle electrode synthesis conditions on the removal rate of ammonia nitrogen.The results showed that the experimental conditions are:α-Fe₂O₃/PAC particle electrode synthesis conditions are PAC:FeCl₃=1:2,microwave power=1000 W,microwave time=60 s,voltage=20 V and particle electrode dosage=0.3 g.After three-dimensional electrolysis,the removal rate of ammonia nitrogen reached 95.30%（20 min）,TN reached 67.97%（20 min）and TP reached 99.59%（10min）.3.Usingα-Fe₂O₃/PAC composite material as a three-dimensional particle electrode,the sewage of Nanzhengli Village Sewage Treatment Plant in Pingyao County was studied in a three-dimensional system.Ammonia nitrogen,total nitrogen（TN）,total phosphorus（TP）and chemical oxygen demand（COD）indicators were mainly tested The results showed that the removal rate of ammonia nitrogen,TN and TP can reach about 95%after 30 min of electrolysis under the optimal conditions.Compared with the complicated sewage treatment process,the three-dimensional system is simple and convenient to operate,and the time required to achieve a better ammonia nitrogen treatment effect is shorter.