Eftaiha Ala'a F, Qaroush Abdussalam K, Alsoubani Fatima, Pehl Thomas M, Troll Carsten, Rieger Bernhard, Al-Maythalony Bassem A, Assaf Khaleel I
Department of Chemistry, The Hashemite University P. O. Box 150459 Zarqa 13115 Jordan
Department of Chemistry, Faculty of Science, The University of Jordan Amman 11942 Jordan
RSC Adv. 2018 Nov 9;8(66):37757-37764. doi: 10.1039/c8ra08040b. eCollection 2018 Nov 7.
Cyclodextrin (α-CD)/KOH pellet dissolved in DMSO was utilized to capture CO. KOH has a dual function of enhancing the nucleophilicity of the hydroxyl groups on the α-CD rims and acting as a desiccant. C NMR spectroscopy provided evidence for the chemisorption of CO through the formation of organic carbonate (RO-CO ·K). This was supported by the spectral changes obtained using ATR-FTIR spectroscopy upon bubbling CO. Activation of α-CD with NaH or bubbling with CO verified that chemisorption occurred solely RO-CO ·K rather than inorganic bicarbonate. Volumetric gas uptake demonstrated a sorption capacity of 21.3 wt% (4.84 mmol g). To the best of our knowledge, this is the highest chemisorption value reported to date for CD-based sorbents. DFT calculations of the Gibbs free energies indicated that the formation of RO-CO ·K was more favoured at the primary carbinol rather than its secondary counterpart.
溶解于二甲基亚砜（DMSO）中的环糊精（α-环糊精）/氢氧化钾颗粒用于捕获一氧化碳（CO）。氢氧化钾具有双重功能，既能增强α-环糊精边缘羟基的亲核性，又能作为干燥剂。碳-13核磁共振光谱（¹³C NMR）通过有机碳酸盐（RO-CO·K）的形成提供了一氧化碳化学吸附的证据。这一点得到了在通入一氧化碳时使用衰减全反射傅里叶变换红外光谱（ATR-FTIR）获得的光谱变化的支持。用氢化钠（NaH）活化α-环糊精或通入一氧化碳证实化学吸附仅通过RO-CO·K发生，而非无机碳酸氢盐。体积气体吸收显示吸附容量为21.3 wt%（4.84 mmol/g）。据我们所知，这是迄今为止报道的基于环糊精的吸附剂的最高化学吸附值。吉布斯自由能的密度泛函理论（DFT）计算表明，RO-CO·K在伯醇处的形成比在仲醇处更有利。
