The Study On Electrocatalytic Degradation Of Refractory Organic Matter By Filling Carbon Catalytic Material Filling Stereo-Electrode

In order to solve the increasingly severe water resources shortage and environmental problems,the research and development of advanced oxidation method has become one of the current research hot-spots,and the advanced oxidation methods currently used on a large scale in industry:Fenton oxidation method,ozone oxidation method,emergency agent method,etc.have high energy consumption,large dosage,high operating costs,and serious secondary pollution.Therefore,it is urgent to explore or improve new advanced oxidation processes.Researchers are now focusing on improving electrocatalytic oxidation.Compared with other advanced oxidation methods,electrocatalytic oxidation method has the characteristics of simple equipment operation control,mild reaction conditions,controllable reaction process,no secondary pollution,etc.,which stands out among many advanced oxidation methods,but its shortcomings are also very obvious,including poor anode stability,serious side reactions of hydrogen evolution and oxygen evolution,poor mass transfer effect,high energy consumption per unit COD and high total energy consumption,which does not meet the conditions for large-scale industrial use.This paper aims to explore the improvement of the performance of electrocatalytic oxidation method,including increasing electrode durability,catalytic performance,and reducing operating costs.In Chapter 2,Co Mn-MOF@NF was prepared by solvothermal method and carbonized at high temperature to obtain Mn_xCo_yO_z/C@NF magnetic electrode,and the surface morphology and composition of the material were observed by SEM and EDS observation.With or without a constant magnetic field of 200 m T,the electrode types and the influence on the degradation efficiency of methyl orange wastewater were explored,and it was found that the electrolysis efficiency of the Mn_xCo_yO_z/C@NF electrode increased by 30.97%after adding a200 m T magnetic field at both ends of the electrode,and the energy consumption decreased by 20%under the same current density,indicating that the material had strong electrocatalytic degradation performance,and the magnetic field had a positive promoting effect on the catalytic performance of ferromagnetic electrode.Chapter 3 of this paper prepared Mn Co Ni O_x@AC catalytic materials by sol-gel method,and the surface morphology and composition of the materials were observed by SEM and EDS observations.Through orthogonal tests,the catalytic degradation effect of Mn Co Ni O_x@AC basket electrode and Mn_xCo_yNi_z@NF plate electrode on methyl orange was compared,and it was concluded that the degradation rate reached the maximum at a constant current of 500 m A and p H=3,and 96.9%of organic matter and sewage color could be removed after 60 min of electrocatalytic oxidation reaction.The electrochemical stability of the Mn Co Ni O_x@AC basket electrode can reach 200 h at a current density of 100 m A/cm~2.Chapter 4 of this paper prepared Fe Co Ni O_x@AC catalytic materials by sol-gel method,and observed the surface morphology and composition of the materials by SEM and EDS observations.Under the condition of constant current of 500 m A and p H=3,the degradation of RO membrane concentrated water in coking wastewater by three granular activated carbon electrode baskets was compared,and the removal rate of organic matter when the Fe Co Ni O_x@AC electrode was used as the electrode was the highest,94.1%.According to the composition analysis of coking wastewater before and after treatment with GC-MS analysis,the raw water contained 13 kinds of refractory organic matter such as benzothiazole,and only2 kinds of small organic matter residues were contained after treatment,and the electrochemical stability of the Fe Co Ni O_x@AC could reach 200 h at a current density of 100m A/cm~2,and the oxygen evolution overpotential was higher than Mn Co Ni O_x@AC.Chapter 5 of this paper uses Fe Co Ni O_x@AC Catalyst for coking wastewater,chemical industrial park wastewater,non-ferrous metal smelting wastewater 1 t/h pilot amplification experiment,after three pilot tests,the effectiveness,stability,economy and applicability of filled stereoscopic electrode for industrial application and other aspects of all-round verification experiments,obtained a lot of valuable industrial application specific parameters,design parameters and some aspects that can be optimized.It proves that the catalyst process is feasible,efficient,stable and economical in industrial application,and has broad industrial application prospects.The experiment proves that the research work in this paper provides a new idea to improve the electrocatalytic oxidation technology.The sol-gel method is used to synthesize Mn Co Ni O_x@AC and Fe Co Ni O_x@AC catalyst with high specific surface area and high stability of activated carbon.The preparation method is simple and the performance is excellent.The use of the basket electrode solves the problems of high energy consumption and poor electrode durability of the current electrocatalytic oxidation method,and provides a thought and prerequisite for the industrial application of electrocatalytic oxidation method.