| The treatment technology of conventional indicators such as COD,nitrogen,and phosphorus in sewage treatment plants in China has been very mature.However,the removal effect of trace refractory organic contaminants such as endocrine disruptors in tailwater is not good,which poses a certain threat to the aquatic ecological environment and human health.Electrical advanced oxidation（EAOPs）technology has a wide application prospect in the field of wastewater treatment containing refractory organic contaminants.However,the hydraulic diffusion boundary layer on the surface of plate anode causes mass transfer problems,seriously reduces the treatment efficiency of EAOPs,and restricts the further application of EAOPs.At present,the electrocatalysis-membrane separation technology based on the combination of EAOPs and membrane separation technology has broken the mass transfer barrier and improved the treatment efficiency of trace contaminants.In this study,under the background of electrocatalysis and membrane separation coupling technology,a new type of DSA anode electrocatalytic filter membrane with economic benefits and mechanical strength was prepared by using titanium as the substrate to construct a composite metal oxide membrane interface.It overcomes the current situation of the lack of functionality of organic membrane and the high cost and low mechanical strength of inorganic membranes,membrane full use of the dual advantages of electrocatalysis and membrane separation.Deep removal of trace amounts of refractory organic contaminants.（1）The Ti/SnO2-Sb/PbO2-Ce membrane electrode was prepared by sol-gel method,thermal decomposition method,and electrodeposition method,and the structure-activity relationship between microscopic interface and material properties was analyzed.The loaded coating is stable and dense and has good electrical conductivity.The double-coated composite membrane electrode has a large specific surface area,rich porosity,and good electron transfer efficiency,which can adapt to long-term,continuous,and complex operating environments.It has good electrocatalytic activity and excellent membrane separation and mass transfer performance.（2）Typical EDCs（taking TBBPA as an example）were selected as the target pollutants, and the effects of different operating parameters on pollutant removal and power consumption were investigated in the electrocatalytic filtration reaction device.The results showed that TBBPA would not be transformed by direct oxidation.In continuous flow operation,a voltage of 3 V was applied when the distance between the cathode and the anode was 5.0 mm,the effluent flow rate was controlled at 1.0 m L·min-1,and 50 m M Na2SO4was used to provide electron transfer.The supporting anode can complete removal of 1 mg·L-1TBBPA under the energy consumption of 0.11 k Wh.（3）Using chromatography,mass spectrometry,EPR spectroscopy,and other means to analyze the degradation and transformation path of contaminants,identify the main reactive oxygen species and their contributions to the transformation process,and track and assess the potential risks in the whole process of pollutant transformation.TBBPA undergoes both debromination and hydroxylation to generate intermediate products such as BPA and phenol,which are subsequently converted to low molecular weight organic acids.Based on the quantitative structure-activity relationship,the toxicity of TBBPA and its degradation intermediates at different stages were evaluated,and the toxicity of TBBPA degradation products was gradually reduced until the production of formic acid,maleic acid and other harmless chemicals,and no secondary pollution was caused in the whole process.The dominant position of 1O2in the current treatment mode was confirmed by free radical capture and quenching. |
