Effect of triethanolamine and sodium hydroxide concentration on the activity of Pt/g-C$_3$N$_4$ catalyst in the reaction of photocatalytic hydrogen evolution under visible light irradiation

In this work, the dependences of the rate of photocatalytic hydrogen evolution under visible light irradiation on the concentration of triethanolamine and sodium hydroxide for 0.1 wt.% Pt/g-C$_3$N$_4$ photocatalyst were studied. The kinetic dependences of the reaction rate versus substrate initial concentration described by the Langmuir–Hinshelwood monomolecular model. Optimal initial conditions for highly efficient hydrogen evolution have been studied. It is shown that under such conditions the catalyst is a stable material in long-term experiments. The maximum rate of hydrogen evolution was 7.2 mmol$\cdot$g$^{-1}$h$^{-1}$.