Mesoporous Materials Preparation And Adsorption Performance On Dyes In Water

Mesoporous material is one of materials with wide applications in the fields such as separation and purification,chemical industry,catalysis,biomaterials and energy.In recent years,various mesoporous materials have been demonstrated excellent performance in the adsorption field because of their unique aperture structures,wide aperture adjustment range,large specific surface area and high thermal stability.In this thesis,two mesoporous materials(LDHs and HAP)were prepared by microwave or simple hydrothermal method,and their adsorption properties on dyes were studied as well.The LDHs with maple ball structure was prepared by microwave assisted heating.The samples was characterized by X-ray diffraction(XRD),Fourier infrared spectrum(FT-IR),Field emission scanning electron microscopy(FESEM),Thermogravimetric analysis(TGA),Surface area and Porosity analysis(BET).The adsorption performance of LDHs material was investigated by using the methyl orange(MO)as the dye.The results showed that the removal rate of MO in the solution reach 83 %.HAP nanoparticle with rod structure was prepared through a simple hydrothermal process.The samples was characterized by XRD,FT-IR,FE-SEM,TEM and BET.Selecting the Congo red(CR)as dye,the adsorption properties of HAP was explored,the adsorption kinetics studies showed that the adsorption process was good fitting the second order kinetics model.The adsorption capacity of CR on HAP reached 337.339 mg/g.HAP sample with special core/shell structure was prepared through the hydrothermal method.The sample was characterized by XRD,TEM,SEM,TGA,FT-IR,and solid state nuclear magnetic resonance spectrum(SSNMR).Methyl orange(MO),Congo red(CR)and Methyl blue(MB)were selected as the dye for exploring the adsorption properties of HAP,the results show that HAP has the high adsorption capacity for three dyes,The adsorption capacity reached 379.120,170.744 and 14.704 mg/g,respectively.and it takes only a few minutes to reach adsorption equilibrium.The adsorption process of dye can be described by pseudo second-order kinetic model.