金属有机框架CPL-1填充柱气相色谱分析氢同位素

摘要

CPL-1 is a metal organic framework (MOF)with potential application as stationary phase material in gas chromatographic (GC )analysis,due to its large specific surface area, uniform pore size and good quantum sieving effect on hydrogen isotopes at low temperatures. Herein,a microporous column packed with CPL-1 was used at cryogenic temperature (77 K), and the column was 1. 0 mm in inner diameter,0. 5 m in length. Single crystals of Al2O3 was used to build flow path for chromatographic carrier gas. The results showed that the adsorption of H2 and D2 with CPL-1 was 4 mmol/g at 77 K,which was better than MnCl2/γ-Al2O3 and γ-Al2O3. With the injection volume increasing from 0. 25 mL to 2 mL,the results showed good lin-ear relationship,and the relative error was less than 4%. The results indicated that the column packed with CPL-1 has wide linear range,good repeatability and high accuracy,and it has potential use in hydrogen isotope analysis with gas chromatography.%金属有机框架(MOFs)材料CPL-1的比表面积大、孔径均一,在低温条件下对氢同位素具有良好的量子筛分效应,是气相色谱固定相潜在的应用材料.采用CPL-1填充制备了长0.5 m、内径1 mm的微孔填充柱,借助单晶Al2 O3颗粒间隙构建了色谱载气流通路径,在低温条件下探索研究了CPL-1填充柱的氢同位素分析性能.结果表明,在77 K时CPL-1对H2和D2的吸附量接近4 mmol/g,优于MnCl2/γ-Al2 O3和γ-Al2 O3,CPL-1填充柱在取样量0.25~2 mL范围内对低浓度氢同位素样品的检测具有良好的线性关系,检测的相对误差小于4%.CPL-1填充柱具有线性范围宽、重复性好、准确度高等优点,在氢同位素色谱分析中具有潜在的应用价值.