| http://www.w3.org/ns/prov#value | - Where metal is to be supported via metal complex ions, the amount is preferably 1 to 5 times, particularly 1 to 3 times, the desired amount of the metal to be supported. [0055] Introduction of the functional group onto the surface of the porous carbon membrane structure can be achieved by, for example, oxidation with an acid solvent, treatment with hydrogen peroxide, or a high temperature treatmen
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