β-环糊精/TiO_2纳米颗粒复合物的制备及其对PCBs的吸附研究

Preparation of β-cyclodextrins/TiO_2 nanoparticles composites and their absorption of PCBs

文章利用溶剂热方法进行表面改性反应,成功制备了β-环糊精/TiO2纳米颗粒复合物(β-CD/TiO2)。FT-IR、UV-Vis、XRD、TGA的表征结果表明,含磺酸基(—SO3)的β-环糊精(β-CD)化合物分子是以化学吸附的方式键合在TiO2纳米颗粒的表面上,而不是简单的物理包覆。PL、UV-Vis和Raman光谱进一步表明,β-CD/TiO2纳米颗粒复合物对2,2′,6,6′-四氯联苯(PCB54)分子具有一定的吸附和包合能力,主要是由于β-CD的空腔与PCB54分子之间在疏水力的作用下,对PCB54分子进行识别和吸附,直至形成了一种稳定的分子间主客体包合物。

The solvothermal strategy was successfully employed to prepare the β-cyclodextrins/TiO2 nanoparticles complexation（β-CD/TiO2） by means of surface modification reaction. The results of FT- IT, UV-Vis, XRD and TGA characterization show that the compound molecules of β-cyclodextrins with sulfonic groups are bonded onto the surface of TiO2 nanoparticles in the form of chemical linkage, not simple physical coating. Further, the spectra of PL, UV-Vis and Raman demonstrate that the as-prepared composites favor to recognize and absorb 2, 21, 6, 6＇-tetrachlorinated biphenyls （PCB54） in the hydrophobic interaction, till to form a kind of stable intermolecular host-guest inclusion complex.