On-site H2O2 production with amphiphilic g-C3N4 as photocatalyst in a combined photocatalysis–extraction–separation process.

[Display omitted] • A green process coupling photoreaction, extraction, and separation for on-site H 2 O 2 production. • Direct H 2 O 2 photocatalytic generation reaction in pure oily alcohol without water. • Amphiphilic g-C 3 N 4 dispersed on phase interface for easy separation and recovery. • Rapid and high-efficiency H 2 O 2 extraction from benzyl-alcohol by water. • Rapid separation of H 2 O 2 solution and benzyl-alcohol with superhydrophobic mesh. • Obtaining H 2 O 2 aqueous solution product with adjustable and usable high concentration. Hydrogen peroxide (H 2 O 2) can be photocatalytically generated by oxygen in water with fatty alcohols as a sacrificial agent; however, it is expensive to separate because of the miscibility of fatty alcohols and water. In this work, H 2 O 2 is directly generated photocatalytically using amphiphilic graphitic carbon nitride (g-C 3 N 4) and oxygen in pure anhydrous oily benzyl alcohol (BA) alone; it is simply extracted by water and separated using a hydrophobic/lipophilic mesh to obtain a high-concentration H 2 O 2 aqueous solution. The results show that the H 2 O 2 concentration in BA after 4 h of photoreaction is 9.45 mM and that of the final solution product can be as high as 70.93 mM in water. Water does not enhance the photoreaction; instead, unexpectedly, it weakens it. However, it is possible to completely extract the H 2 O 2 from the reacted BA. In this study, the H 2 O 2 solution is rapidly separated from the BA with a separation efficiency of 99.97% using a hydrophobic mesh. The photocatalyst g-C 3 N 4 is present at the water/BA interface owing to its amphiphilicity, and it can be caught by the mesh during separation and reused after backwashing. The combined photoreaction, extraction, and separation processes provide a simple, environment-friendly, and rapid H 2 O 2 photogeneration process for the on-site production of a usable H 2 O 2 solution. [ABSTRACT FROM AUTHOR]