| This paper takes carbon cloth as the basic carrier,PES/MWCNT-COOH flat sheet membrane with good conductivity was prepared by electrospinning technology.Using the flat sheet membrane as the substrate,PES-SPES/MWCNT/Sb-SnO2/PbO2 electrocatalytic organic nanofiltration membrane was prepared by phase transformation method.PES/MWCNT-COOH flat sheet membrane was prepared by electrospinning technology.The solution of electrostatic spinning is prepared by dissolving polyethylene pyrrolidone and multi-walled carbon nanotubes and polyether sulfone in N-N dimethyl acetamide.Polyethylene pyrrolidone and polyether sulfone and sulfonated polyether sulfone are dissolved in N-N dimethyl acetamide,lead dioxide and multi-walled carbon nanotubes and polyaniline and antimony-doped tin dioxide are dissolved in the above solution at a certain proportion.PES-SPES/MWCNT/Sb-SnO2/PbO2 electrocatalytic organic ultrafiltration membrane was prepared by dipping?scraping?sol-gel and water bath.Chitosan is dissolved in acetic acid to prepare an aqueous phase,trimesoyl chloride is dissolved in n-hexane to prepare an oil phase,organic ultrafiltration membrane is placed in aqueous and oil phases,the electrocatalytic organic nanofiltration membrane is finally prepared.The PES-SPES/MWCNT/Sb-SnO2/PbO2 electrocatalytic organic nanofiltration membrane is analyzed by XRD?XPS?IR and other characterization methods.The results show that various elements including Sb and Pb have been successfully loaded on the organic membrane.The results of four-probe test and CV analysis show that MWCNT endowed PES/MWCNT-COOH flat membrane with good conductivity,the highest conductivity up to 0.0390S/cm,Sb-SnO2 and PbO2 endowed the organic nanofiltration membrane excellent electrocatalytic performance.SEM show that the surface of the nanofiltration membrane is smooth and the internal finger-like pore size is uniformly distributed.PEG interception performance indicate that the average pore size of the nanofiltration membrane is 1.5nm.Using high salt direct red 31 dye wastewater as processing objects,the ability of electrocatalytic organic nanofiltration membrane to inhibit membrane fouling was investigated.The operating parameters of the membrane separation process:such as voltage,transmembrane pressure difference,dye initial concentration and salt content,were determined preliminarily.The results show that:? Under the premise of the same parameters except voltage,the flux of the unpolluted organic nanofiltration membrane without electrocatalysis decreases by 18.6%in 6 hours,while that of the unpolluted organic nanofiltration membrane decreases by only 5.8%in 6 hours under applied voltage.The results show that the electrocatalytic intervention could obviously alleviate the membrane fouling.After applying a certain voltage to the organic nanofiltration membrane with the membrane flux attenuated by 20%,it can be restored to 96.7%of the initial membrane flux within 6h by electrocatalysis.The results show that the electrocatalytic intervention has a significant effect on eliminating membrane fouling.The nanofiltration membranes before and after flux recovery was characterized by SEM.It was observed that the particulate matter in the surface and pore of organic nanofiltration membranes after flux recovery was significantly less than that of nanofiltration membranes before recovery.The main component of particulate matter was dye molecule direct red 31 by solid ultraviolet-visible absorption spectroscopy.? Wlien the voltage is 6V,the transmembrane pressure difference is 0.4MPa,the inorganic salt content is 6%,the initial dye concentration is 25 mg/L,and the pH is 6,PES-SPES/MWCNT/Sb-SnO2/PbO2 electrocatalytic organic nanofiltration membrane has the best effect on the treatment of high-salt organic dye wastewater.The effluent is a clear colorless liquid,the dye retention rate is above 98%,and the inorganic salt transmission rate is up to 99%,realizing the efficient separation of organic matter and inorganic salt. |
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