Preparation,Performance Analysis And Kinetic Model Construction Of ECWAO Reaction Catalyst Based On Carbon-supported Transition Metal Oxides

Wet Air Oxidation（WAO）is a typical advanced oxidation technology that uses oxygen（O₂）in the air to oxidize organic and/or oxidizable inorganic pollutants at high reaction temperature（200-325℃）and pressure（5-15 MPa）.The use of suitable catalysts can alleviate harsh operating conditions and reduce WAO’s energy consumption.However,running the reaction under environmental conditions is still a big challenge.Recently,our research group discovered that O₂ can be effectively activated on the surface of some catalysts with the help of an anode electric field.Based on this,a new type of electro-assisted catalytic humid air oxidation that degrades various organic pollutants under environmental conditions has been developed（ECWAO）process.In this paper,based on graphite felt（GF）supported mono-/binary transition metal oxides as anode catalytic materials,an ECWAO system for the treatment of refractory organic pollutants in wastewater under normal temperature and pressure conditions is constructed,and the catalyst is prepared,research on system efficiency and dynamics model construction has been carried out.A new type of molybdenum-manganese bimetallic composite material supported on porous graphite felt was synthesized by a simple co-impregnation and pyrolysis method,and it was used as the anode material of ECWAO to degrade various organic pollutants that are refractory to biodegradation at room temperature.The anode material exhibits good catalytic activity and high stability in the ECWAO process.Under the+1.0 V（vs.SCE）potential,the model pollutant sulfamethoxazole（SMX）can be completely removed within 120 minutes,and the mineralization efficiency can reach more than90%.Within the same treatment time,Bisphenol A（BPA）,Triclosan（Triclosan,TCS）,Sulfamethoxazole（SMX）,Tetracycline（TET）,Ibuprofen（IBU）and cyclos The mineralization efficiency of Profloxacin（Ciprofloxacin,CIP）is greater than 85%.By constructing a generalized kinetic model based on total organic carbon（TOC）consumption as a lumped parameter,the mineralization process of organic pollutants in the ECWAO system is described and predicted.Using MoO₂@Mn₂Mo₃O₈/GF and Ni@Ni O/GF as anodes,SMX and TCS as model pollutants,respectively,the degradation kinetics of organic pollutants on the surface of the composite anode were studied.It was found that the mineralization of SMX and TCS in the ECWAO process follows pseudo first-order kinetics.Various process parameters that affect the ECWAO reaction were optimized,and ECWAO optimized process conditions for different electrodes were obtained,which provided new research ideas and practical experience for realizing low energy consumption and efficient treatment of refractory organic pollutants in wastewater.