Investigation of catalytic ozonation for dye wastewater treatment using bimetal-supported 13 X zeolite
In this study,six composite catalysts—Mn-Fe,Mn-Cu,Mn-Ce,Cu-Fe,Ce-Cu,and Fe-Cewere prepared using the impregnation-calcination method.We employed 13X zeolite as the carrier and Mn,Fe,Cu,and Ce as active components to simulate the catalytic ozonation of acid scarlet GR dye wastewater.Focusing on the chroma removal rate and the Chemical Oxygen Demand(COD)removal rate,we selected the optimal active component catalyst and optimized the preparation conditions.Additionally,we conducted a stability analysis of the catalyst over five cycles.The surface structure and primary components of the catalyst were analyzed using Scanning Electron Microscopy(SEM),X-ray Diffraction(XRD),Brunauer-Emmett-Teller(BET)analysis for specific surface area and pore size,as well as X-ray Photoelectron Spectroscopy(XPS).The results indicate that Mn-Fe is the most effective active component for the degradation of acid scarlet GR dye.Additionally,the synergistic effect between Mn and Fe further enhances the catalytic reaction.Factors such as the mass fraction of metal ion loading,the ratio of n(Mn)∶n(Fe),calcination time,and calcination temperature significantly influence both the chroma removal rate and the COD removal rate.Based on the results of the orthogonal test,the factors influencing the removal rate are ranked in the following order:metal ion loading mass fraction,n(Mn)∶n(Fe)ratio,calcination time,and calcination temperature.The optimal preparation parameters for the catalyst are an n(Mn)∶n(Fe)ratio of 1∶1,a metal ion loading mass fraction of 0.75％,a calcination time of 2 hours,and a calcination temperature of 650 ℃.The catalyst demonstrated good stability after five cycles.Characterization results indicate that iron(Fe)and manganese(Mn)exist in oxide form on the surface of the zeolite,with both metal elements exhibiting polyvalent states.After loading,there was a slight decrease in the specific surface area,pore volume,and pore diameter of the catalyst.Furthermore,this study may contribute to the ongoing development of future catalysts.
environmental engineeringcatalystcatalytic ozone oxidationzeoliteacid scarlet GR
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维普
