聚合物调控氧化钛层柱蒙脱石的结构和性能研究

为了改善氧化钛层柱蒙脱石的结构性能,以长链聚合物-端氨基聚甲基环氧乙烷(PPO-D-2000)为结构调节剂,调控合成了聚合物-氧化钛层柱蒙脱石材料。采用X射线粉末衍射、红外、拉曼光谱、TG/DSC、TEM和BET等手段进行了结构表征。结果表明,相比于小分子量表面活性剂而言,长链聚合物不仅能显著提高氧化钛层柱蒙脱石中的二氧化钛含量,而且比表面积比单独氧化钛柱撑蒙脱石增加了约13%,达到241.52m2/g,尤其是孔径、孔体积等孔道结构参数增加一倍左右。将合成的柱撑蒙脱石材料应用于对水中甲基橙的吸附和光催化性能研究表明,聚合物的调控作用能提高氧化钛层柱蒙脱石的吸附能力,光催化效率也有所改善。因此,聚合物对优化无机层柱粘土材料结构、改善吸附和催化性能具有良好的调控作用,为发展环境催化材料提供了新的途径。

Effects of Polymer on the Modified TiO2 Pillared Montmorillonite

With the aim of improving the microstructures and properties of TiO-2 pillared montmorillonite(MMT),a long-chain polymer(polyoxypropylenediamine,PPO-D-2000) were used as organic micro structural modifier to synthesize composite pillared MMT.The materials were characterized by XRD,FT-IR,FT-Raman,TG/DSC,TEM,and BET methods.The results shows that as compared to low-molecular weight surfactant,this polymer significantly expanded the interlayer spacing and thus more TiO-2 could be intercalated into MMT.The specific surface area of polymer/TiO-2 pillared MMT was increased by 13% with comparison to TiO-2 pillared MMT and rose to 241.52m2/g.Especially,both the pore diameter and volume are doubled,and thus the pore structure is optimized markedly.The investigation on the photocatalytic degradation of methyl orange in aqueous solution shows that the modulation of polymer molecules raise the adsorption content of montmorillonite and improves the photocatalytic activity.Therefore,this route provides a novel alternative to design and prepare advanced eco-catalytic materials with high adsorption capacity and catalytic activity.