Abstract
With the aim of improving the microstructures and properties of TiO2 pillared montmorillonite (MMT), a long,chain polymer (polyoxypropylenediamine, PPO,D 2000) was used as a template to synthesize composite pillared MMT. The materials were characterized by X,ray powder diffraction (XRD), Fourier transform infrared (FT,IR) spectrophotometer, Fourier Raman (FT,Raman)spectrophotometer, thermo,gravimeter/differential thermogravimeter (TG/DSC), transmission electron microscopy (TEM), and Brunauer,Emmett,Teller (BET) methods.The results show that as compared to low,molecular weight surfactant, this polymer significantly expanded the interlayer spacing and thus more TiO2 could be intercalated into MMT. The specific surface area of polymer/TiO2 pillared MMT was increased by 13% with comparison to TiO2 pillared MMT and rose to 241.52m2/g. Both the pore diameter and volume are doubled, and thus the pore structure is optimized markedly. The investigation on the photo,catalytic degradation of methyl orange in aqueous solution show that the modulation of polymer molecules raise the adsorption content of montmorillonite and improve the photo,catalytic activity. Therefore, this process provides a novel alternative to design and prepare the advanced eco,catalytic materials with high adsorption capacity and photo,catalytic activity.
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