An acid-catalyzed polyvinyl alcohol-glutaraldehyde gel reaction system with an in-situ acid formation process is designed to prepare size-and morphology-controllable porous g-C3N4 microspheres in a microfluidic system.A tritium-compatible porous g-C3N4 block is fabricated by using inorganic binder and porous microspheres as raw materials.The effects of gel composition and calcination mode on the specific surface area and mechanical strength of the porous g-C3N4 microspheres,as well as the effects of inorganic binder mass fraction and microsphere size on the specific surface area and mechanical strength of the resulting g-C3N4 blocks are investigated.It is shown by the results that the microsphere size has a significant impact on the properties of the block materials.Under the same binder mass fraction,increasing microsphere size by 79.5％results in a 205％increase in specific surface area of the blocks,while only 42％decrease in its mechanical strength.It is proved from a cryo gas adsorption experiment at 4.5 K that the selectivity of the prepared g-C3N4 porous block adsorption layer for hydrogen over helium can reach 13.02.
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