【摘要】 纳米TiO2经3-氨丙基三乙氧基硅烷(APTES)改性后,再通过聚乙烯亚胺(PEI)单体在APTES-TiO2表面进行原位化学氧化接枝聚合,制备了基于共价键结合的PEI/APTES-TiO2纳米复合光催化材料。以甲基橙(MO)为目标降解物,研究了所制备复合材料在紫外光下和太阳光作用下的光催化性能。通过红外光谱(FTIR)、X射线衍射(XRD)、透射电镜(TEM)等对所制备的复合材料进行了表征。结果表明,TiO2经过有机改性后复合材料在紫外光和太阳光下都出现了较强的吸收,光能的利用率和光生载流子的分离效率得到提高,复合材料表现出较高的光催化活性。更多还原

【Abstract】 After TiO2 nanoparticles were surface modified by the couplingagent(3-aminopropyl)triethoxysilane(APTES-TiO2),polymine(PEI) was grafted onto the surface of the APTES-TiO2 nanoparticles by in situ chemically oxidative polymerization resulting in a PEI/APTES-TiO2 nanocomposite photocatalyst.PEI and TiO2 were linkaged by chemical bonds.The nanocomposites were characterized using fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD) and TEM.The photocatalytic activity was evaluated by the degradation of methyl orange(MO) in aqueous solution under UV and solar light irradiation.Results show that the sensitizing effect of PEI can improve the light response of TiO2 and enhance the separation efficiency of electron and hole pairs which in turn promotes the photocatalytic ability of the nanocomposites.更多还原