The Design Of Electrocatalytic Membrane Electrode Based On The Treatment Of Refractory Industrial Wastewater And Its Catalytic Oxidation Performance

To treat the high concentration refractory industrial wasterwater with high efficiency is a great challenge in the field of water treatment all over the world.The traditional refractory industrial wastewater treatment technology has been suffered from low efficiency and high energy consumption.In this thesis,nano-metallic oxide catalysts?MnO₂ and Ti O₂?were used to load porous carbon membrane and titanium membrane through the sol-gel method or the hydrothermal method to fabricated three-dimensional electrocatalytic membrane electrodes,which were employed to construct electrocatalystic membrane reactors?ECMR?.The design optimization of catalyst morphology regulation and reaction-separation synergy mechanism research were also explored so as to develop a method for refractory industrial wastewater treatment.?1?Using coal-based carbon membrane as the base membrane,the three different dimensions of membrane electrodes with 0D MnO₂ NPs/C,1D MnO₂ NWs/C and 2D MnO₂ NSs/C were prepared by sol-gel method or hydrothermal method.The results indicated that the morphology of catalysts affected the catalytic activity.The MnO₂NWs/C membrane electrode exhibited high specific surface area(86.9 m² g^-1)and effective electrocatalytic surface area?5.0 cm²?.The electrochemical activity of MnO₂NWs/C membrane electrode was better than that of MnO₂ NSs/C and MnO₂ NPs/C membrane electrodes.?2?The 1D MnO₂ NWs/C membrane electrode was used as the anode to constructECMR for As?III?oxidation.After optmilization of ECMR operating conditions?current density,resendence time,As concentration and p H?,96.0%conversion of As?III?was obtained and ECMR showed good stability.The mechanism was explored via ESR and electrochemical measurements.Results showed that the result·OH during the ECMR operating promoted the transformation of the formation of As?V?.When NF separation of arsenic-containing solution after electrocatalytic membrane reactor,the As concentration after NF treatment was lowered to below 10?g/L?WHO emission standard?even if the As?III?concentration in the feed solution of ECMR was up to 2000?g/L.?3?Using a flat porous Ti membrane as a titanium source and a base membrane, three different morphology-supported Ti-based electrocatalytic membrane electrodes with 0D Ti O₂ NPs/Ti,1D Ti O₂ NWs/Ti and 2D Ti O₂ NSs/Ti were prepared through hydrothermal method without introducing additional external titanium sources.The results indicated that the Ti O₂ NWs/Ti membrane electrode exhibited high specific surface area(94.5 m² g^-1)and effective electrocatalytic surface area?2.4 cm²?.The electrochemical activity of Ti O₂ NWs/Ti membrane electrode was better than that of Ti O₂ NSs/Ti and Ti O₂ NPs/Ti membrane electrodes.The 1D Ti O₂ NWs/Ti membrane electrode was used as the anode to construct ECMR for the catalytic degradation of antibiotic.After optmilization of ECMR operating conditions,the removal rates of TCH and TOC were obtained 99.6%and 90.6%.In addition,ECMR displayed good universality for other antibiotic degradation.