Abstract
Porous graphitic carbon nitride obtained by pyrolysis of melamine in the presence of silica (TEOS in the reaction mixture) has been found to be more active in photocatalytic hydrogen evolution from the aqueous solutions of electron donors (organic acids) under visible light irradiation compared to the bulk analogue. The use of the optimal melamine/TEOS molar ratio in the initial reaction mixtures allows to obtain g-C3N4 characterized by increased mesoporosity due to the formation of smaller particles. It has been shown for the first time that oxalic acid can be used as an environmentally friendly sacrificial donor allowing to reach significantly higher rates of the photocatalytic reaction (up to 300 μmol H2/h*gphotocat.).
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