【摘要】 本文以氨基修饰的锆基金属有机框架材料（MOF） UiO-66-NH₂为香料载体,研究了其对一系列香料分子的吸附和释放行为.我们发现UiO-66-NH₂对非极性的萜类香料吸附几乎无差别,而在极性香料的酯类吸附上差异较大.我们通过扫描电子显微镜（SEM）、X射线衍射仪（XRD）和红外光谱（FTIR）等对UiO-66-NH₂吸附香料后的样品进行表征,结果表明MOF材料吸附香料后不会造成结构坍塌和晶型变化, UiO-66-NH₂中的氨基与不同的酯类香料可形成氢键,对提高吸附量和延长缓释效果起到积极促进作用.与传统吸附材料活性炭相比, MOF对香料有更好的吸附效果.我们使用顶空-气相色谱对酯类香料的释放进行检测,结合释放动力学模型分析,发现其释放行为符合Korsmeyer-Peppas模型,孔道扩散是其释放的限速性环节.更多还原

【Abstract】 In this paper, we studied the adsorption and release behavior of various fragrant molecules to zirconiumbased and amine-functionalized metal-organic framework materials（MOF） UiO-66-NH₂. The results showed that UiO-66-NH₂ has almost no difference in the adsorption of non-polar terpenoid fragrances, but there is significant difference in the adsorption of polar ester fragrance. The fragrance-adsorbed UiO-66-NH₂ was characterized by SEM, PXRD and FTIR. No structural collapse and crystal form change was found after the adsorption of fragrant molecules. Amine groups in UiO-66-NH₂ can form hydrogen bonds with different ester fragrance, which favor the adsorption and sustain release of fragrance. These MOF materials showed much higher adsorption capacity to fragrant molecules than the traditional adsorbent activated carbon. The release kinetics of ester fragrance was studied by headspace-gas chromatography. It was found the release kinetics was consistent with the Korsmeyer-Peppas model and the pore diffusion was the rate-limiting state of its release.更多还原