Abstract
Gas separation using membrane technology is fascinating because of its low energy consumption, simple operation, and high efficiency. This chapter focuses on exfoliated Ti 3 C 2 T x MXene nanosheets for their use as building blocks or fillers to assemble MXene-based 2D membranes for selective gas separation, including H 2 /CO 2 , CO 2 /N 2 , and CO 2 /CH 4 separation. The excellent separation performance is attributed to the highly ordered sub-nanometer channels in the stacked MXene membranes, which has been demonstrated by X-ray diffraction, where the sharp peak with a high intensity proved that the MXene membranes are orderly stacked. In addition to pure MXene membranes for gas separation, MXene nanosheets can also be used as fillers for mixed matrix membranes to enhance the separation performance of the polymer component. By using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy characterizations, the authors demonstrated the existence of hydrogen bond functional groups between the MXene nanosheets and Pebax.
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