Effect of Lithium Doping on the Structures and CO2 Adsorption Properties of Metal‐Organic Frameworks HKUST‐1

Abstract The metal‐organic framework HKUST‐1 was modified by lithium doping to enhance its CO 2 adsorption property. An optimal CO 2 adsorption capacity was achieved as a lithium nitrate solution with a moderate concentration was used as the doping agent in the modified HKUST‐1. The chemical and crystalline structures of the modified HKUST‐1 were characterized in detail. It was found that the crystalline structures and morphologies of HKUST‐1 were well preserved after lithium doping. Also, the lithium doping did not deteriorate the thermal stability of HKUST‐1. Based on the experimental results of CO 2 adsorption by in‐situ diffuse reflectance infrared Fourier transform spectroscopy, a possible mechanism of CO 2 adsorption in the lithium doped HKUST‐1 was proposed. It is believed that the incorporation of lithium has enhanced the interaction between CO 2 molecules and the metal‐organic frameworks. As a result, the CO 2 adsorption capacity greatly increased. These findings and insights are helpful to the development of high‐performance materials for CO 2 adsorption in the future.