Preparation Of FeOCl/Mt And CWPO Degradation Of Magenta Wastewater

China's industrial development is rapid,and the textile industry has always been considered one of China's traditional pillar industries.The resulting printing and dyeing wastewater has the characteristics of high chroma,high toxicity,and complex components.In order to find an efficient and clean,green and economical wastewater treatment method,a series of samples were prepared and screened under different conditions to obtain a highly active and stable catalyst.The catalytic wet hydrogen peroxide?CWPO?was used to treat the wastewater,and the relevant process conditions were optimized to study the reaction mechanism.Iron oxychloride/pillared montmorillonite?FeOCl/Mt?samples were prepared by wet impregnation method and solid melting method.A series of samples were prepared under different FeOCl loadings,roasting temperature and roasting time.The micro-morphology and structure of this series of samples were analyzed by various characterization techniques and used as a catalyst to treat magenta simulated dye wastewater through CWPO degradation.The COD removal rate of the magenta simulated dye wastewater was used to evaluate the catalytic performance of the catalyst,and the optimal preparation conditions were selected.The results show that when the solid melting method is used,the FeOCl loading is 3%,the roasting temperature is 220?,and the roasting time is 120 minutes,the active component FeOCl converted from FeCl₃·6H₂O in the catalyst has a high content,complete crystals,and is on the support surface evenly dispersed,the structural parameters of the catalyst increased significantly,the specific surface area reached 175 m²·g^-1and d₀₀₁was 1.812 nm.The prepared 3%-FeOCl/Mt?g?-220-120 catalyst was used for CWPO to degrade basic fuchsin simulated dye wastewater.After 210 minutes of reaction,the COD removal rate of the wastewater was 80.2%.After repeated use of the catalyst six times,the COD removal rate of magenta simulated dye wastewater decreased by only 18.2%,while the total iron content decreased by about 9.8%,indicating that the catalyst has good activity and stability.The 3%-FeOCl/Mt?g?-220-120 catalyst screened after optimizing the preparation conditions was used to treat 100 m L of magenta simulated dye wastewater with an initial concentration of 200 mg·L^-1through the CWPO reaction system,and it was optimized for optimal degradation.The conditions are:the reaction temperature is 60?,the initial p H is 5.0,the catalyst addition amount is 0.05 g,the molar ratio of magenta/H₂O₂?mmol/mmol?is 60,and after 210 minutes of reaction,the COD removal rate of the final wastewater is 82.4%.Through the active group capture experiment,it was proved that HO·is the active group in the reaction.The mechanism of CWPO reaction degradation of organics was studied.The Fermi's equation was used to simulate the reaction kinetics of the catalyst for treating alkaline fuchsin wastewater.It can be seen from the fitting results that the Fermi equation has a high degree of agreement,and more reliable kinetic parameters can be obtained.Combined with Arrhenius equation,the apparent activation energy Ea of this reaction is 47.49 k J/mol.