The Research On Preparation And Properties Of Palygorskite/Magnetic Iron Oxide/TiO₂ Composite

In this research,palygorskite and magnetite composite material was prepared in the system of ferrous sulfate and potassium nitrate with characterization of XRD,TEM, FT—IR and MS.To deal with the methylene blue,It is studied that effect of calcination temperature for absorptive activities of composite absorbent,adsorption dynamics and adsorption isotherm of adsorb methylene blue by Adsorbent,effect of pH and reuse of absorbent.Palygorskite/ magnetic iron oxide/ TiO₂ composite photocatalyst was prepared by hydrolyze Tetrabutyl titanate to load TiO₂ in palygorskite/magnetic iron oxide surface.The composite photocatalyst were characterized by XRD,TEM,UV-Vis,MS,FT-IR.To deal with the methyl orange,It is studied that effect of calcination temperature for absorptive and photocatalytic activities of composite photocatalyst,different photocatalyst dosage and different TiO₂ loadings for photocatalytic efficiency,the phase in composite photocatalyst for photocatalytic efficiency and reuse composite photocatalyst for photocatalytic efficiency.The conclusions are as follows:(1)Load Fe3O4 in surface of palygorskite,the amount of palygorskite adding in the system effect on size,distribution on the surface of palygorskite and magnetic properties of magnetite.As the increase of palygorskite adding, size of magnetite decreases and grain distribution of Fe₃O₄ is more uniformity.While calcined temperature is higher than 300℃,no magnetite crystal is formed in system.(2)The absorption of composite adsorbent calcined at 600℃is the best,with very high susceptibility,which is the most suitable for magnetic absorbent.Magnetic iron in composite adsorbent has almost no impact on the largest adsorption of palygorskite,but slow down the absorption rate of palygorskite.Composite adsorbent for the absorption of methylene blue,with the pH increased absorption effect of improving.Magnetic palygorskite adsorbent is suitable for reuse,we can see that from the test:which reused for six times,still has a very high susceptibility and the absorption effect.(3)The presence of palygorskite can control the nucleation and growth of TiO₂,makes TiO₂ grows on the surface of palygorskite is nanoscale,uniformity,good dispersion of particles. Photocatalytic activities of uncalcined composite photocatalyst is the best,with high susceptibility,which is the most suitable for magnetic photocatalyst.With the increase of calcination temperature,size of TiO₂ in the composite photocatalyst get larger, photocatalytic efficiency get lower.Photocatalytic efficiency of composite photocatalyst is better than the general analyze purely TiO₂.