The Series Of Fe-pillared Montmorillonite For The Catalytic Wet Peroxide Oxidation Of Methyl Orange:Characterization And Catalytic Activity By Ultrasonic

According to statistics,about 80% of textile waste water in China comes from the printing and dyeing industry.As a result of these waste water shows complex composition,high chroma and high toxic,so how to deal with these waste water efficiently at low cost is a difficult problem at present,while the technical choices and the corresponding catalyst preparation is even more important.In this paper,ion-exchange method was used to synthesize the series of Fe/Co/Al-Mt-pillared montmorillonite.The effects of preparation method,Fe/Co molar ratio,active metal loading(AML),calcination temperature and degradation conditions on the properties of Fe/Co/Al-Mt samples were investigated.The microstructure of this series of samples was also analyzed by N2-adsorption/desorption,FT-IR,XRD,DR UV-vis spectroscopy,SEM,TG/DTG and other techniques.In addition,the methyl orange(MO)of simulated dye wastewater was degraded by the catalytic wet hydrogen peroxide method(CWPO technology)to evaluate its parameters(such as degradation,COD removal and Fe leaching indexes).The experimental results show that the structural properties of montmorillonite are obviously improved after pillaring,when Fe/Co molar ratio is 7/3,AML is 6% and calcined at 500? for 2h and ultrasonic treatments are applied,the samples which made by ultrasound Fe/Co/Al-Mt(U)method has larger surface area 133cm2/g than that of the conventional method Fe/Co/Al-Mt(C)124cm2/g,more active component(Co Fe2O4 nanoparticles),the dispersity is good,the catalytic activity(the color removal rate is close to 100%,COD removal rate can reach 74.89%,which is 3.49% higher than the conventional method),after the sample was used continuously for five times,COD removal could still reach to 66.28% and the Fe ion dissolution is less than 1mg/L.In addition,the introduction of ultrasound can save about 60% of the time in one preparation period when preparing samples,which has played a positive role in the shaping and industrial application of samples in the future.In the process of technological conditions,the experiment is still using CWPO method,The optimized Fe/Co/Al-Mt sample was subjected to CWPO to degrade methyl orange dye wastewater under ultrasonic condition,focusing on the temperature,p H,Fe/Co/Al-Mt(U)quantity and H2O2 concentration's influence factors.The results showed that when the reaction temperature was 60?,the p H value of water was 3.0,the sample dosage was 0.1g/L and H2O2 concentration was 24mmol/L,the COD removal rate was 74.5%,compared with no using ultrasonic effect was increased by 3.8%,and the Fe ion dissolution was only 0.63mg/L,which proves the practicality of the method.Finally,the kinetics of CWPO degradation of simulated wastewater was studied.We established the Fermi's equation of semi-empirical kinetic model to study different experimental conditions,such as p H value,p H,amount of sample and concentration of H2O2,the apparent activation energy Ea was 47.484KJ/mol.Compared with the previous reports in the literature slightly lower,making the CWPO efficiency of dye wastewater treatment has been further improved.