Effect of Functional Groups on Low-Concentration Carbon Dioxide Capture in UiO-66-Type Metal-Organic Frameworks
Zihao Liang1,2, Yangyang Ou1,2, El-Sayed M El-Sayed3
1College of Chemistry, Fuzhou University, Fuzhou 350116, China.
Abstract:
The selective capture of low-concentration CO2 from air or confined spaces remains a great challenge. In this study, various functional groups were introduced into UiO-66 to generate functionalized derivatives (UiO-66-R, R = NO, NH, OH, and CH), aiming at significantly enhancing CO2 adsorption and separation efficiency. More significantly, UiO-66-NO and UiO-66-NH with high polarity exhibit exceptional CO2 affinity and optimal separation characteristics in mixed CO2/O2/N2 (1:21:78). In addition, the impressive stability of UiO-66-NO and UiO-66-NH endows them with excellent recycling stability. The effective adsorption and separation performances demonstrated by these two functional materials suggest their potential as promising physical adsorbents for capturing low-concentration CO2.
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