Photocatalytic synthesis of high-concentration hydrogen peroxide by efficient photothermal synergy

Abstract

We here report an energy-saving and cost-effective strategy to produce high-concentration H2O2 in commercial sponge with aqueous storage functions. Thereinto, the rationally designed hybrid consisting of thiourea-group-grafted covalent triazine frameworks (CTFs) and carbon dots (CDs) uniformly wraps the skeletons of the porous sponge to serve as photocatalytic system. This system allows solar radiation to be localized at the surface of photocatalyst and meantime suppresses the tremendous energy consumption of evaporation significantly by a simple seal way, thus giving rise to the required reaction temperature. With it, not only solar-converted heat as by-product in photocatalysis is fully utilized in H2O2 production, but also high-concentration H2O2 solution (105.2 mM for per gram photocatalyst in 1 h) is gained due to catalysis confinement effect. For application, our presented design exhibits more superior activities in degrading different organic pollutants (such as Rhodamine B, phenols and tetracycline) than conventional particulate photocatalysis thanks to in situ formation of concentrated H2O2 in sponge.