Catalytic ozonation technology has attracted copious attention in water purification owing to its favorable oxidative degradation of pollutants and mitiga-tion of membrane fouling capacity.However,its extensive industrial application has been restricted by the low ozone utilization and limited mass transfer of the short-lived radical species.Interlayer space-confined catalysis has been theoretically proven to be a viable strategy for achieving high catalytic efficiency.Here,a two-dimen-sional MnO2-incorporated ceramic membrane with tunable interspacing,which was obtained via the intercalation of a carbon nanotube,was designed as a catalytic ozonation membrane reactor for degrading methylene blue.Benefit-ing from the abundant catalytic active sites on the surface of two-dimensional MnO2 as well as the ultralow mass transfer resistance of fluids due to the nanolayer confine-ment,an excellent mineralization effect,i.e.,1.2 mg O3(aq)mg-1 TOC removal(a total organic carbon removal rate of 71.5％),was achieved within a hydraulic retention time of 0.045 s of pollutant degradation.Further,the effects of hydraulic retention time and interlayer spacing on methylene blue removal were investigated.Moreover,the mechanism of the catalytic ozonation employing catalytic ozonation membrane was proposed based on the contribu-tion of the Mn(Ⅲ/Ⅳ)redox pair to electron transfer to generate the reactive oxygen species.This innovative two-dimensional confinement catalytic ozonation membrane could act as a nanoreactor and separator to efficiently oxidize organic pollutants and enhance the control of membrane fouling during water purification.

Dean Xu;Tong Ding;Yuqing Sun;Shilong Li;Wenheng Jing

State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 210009,China

化学科学与工程前沿

[1]Dean Xu;Tong Ding;Yuqing Sun;Shilong Li;Wenheng Jing-.Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for efficient water purification)[J].化学科学与工程前沿,2022(05):731-744

copious,interspacing

Interlayer,confined,two,dimensional,manganese,oxide,carbon,nanotube,catalytic,ozonation,membrane,water,purification,Catalytic,technology,has,attracted,attention,owing,its,favorable,oxidative,degradation,pollutants,mitiga,fouling,capacity,However,extensive,industrial,application,been,restricted,by,ozone,utilization,limited,mass,transfer,short,lived,radical,species,space,catalysis,theoretically,proven,viable,strategy,achieving,high,efficiency,Here,MnO2,incorporated,ceramic,tunable,which,was,obtained,intercalation,designed,degrading,methylene,blue,Benefit,from,abundant,sites,surface,well,ultralow,resistance,fluids,due,nanolayer,excellent,mineralization,O3,aq,TOC,removal,total,organic,achieved,within,hydraulic,retention,Further,effects,interlayer,were,investigated,Moreover,mechanism,employing,proposed,contribu,redox,pair,electron,generate,reactive,oxygen,This,innovative,confinement,could,nanoreactor,separator,efficiently,oxidize,enhance,control,during

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