Designing efficient membranes for gas separation is a challenge for future clean energy generation. Here we report a graphene-wrapped hydroxyapatite (G-HAP) membrane for efficient H2separation from CH4and light hydrocarbons. The pores are prepared by graphene-wrapping HAP crystals containing surface grooves along the c-axis. The grooves form 1D channels at the graphene-HAP interface. The G-HAP membrane achieves a permeance of 5.5 × 10-7mol m-2s-1Pa-1(2.5 × 105barrer) and selectivity of 40.0 for H2/CH4. The G-HAP membrane created by graphene-wrapping has channels derived from the surface groove structure that are responsible for the gas separation, as suggested by molecular dynamics simulations. The proposed graphene-wrapping approach is promising for the development of membranes for efficient H2separation.
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