Poly(heptazine imide) (PHI) has emerged as a promising photocatalyst due to its ability to store long-lived photoelectrons. In this study, we report a structure-directed approach to synthesize potassium (K)-PHI from various allotropes of polymeric carbon nitride (PCN) for facilitating photoelectron transfer and improving H2 production under visible light. The K-PHI derived from the melem units exhibits high structural intactness and produces H2 more efficiently than the K-PHIs from other allotropes of PCN. The PCN-precursor optimization, to reduce the defect states and increase cyanamide functionalities of the K-PHI, serves as a vital factor in photoelectron extraction by Pt-cocatalyst for H2 production. Moreover, the melem-derived K-PHI steadily reforms cellulose into H2 (34 μmol h−1) and several chemicals for 6 days. The chemicals from the cellulose-reforming comprise C6 to C1 esters, acids, aldoses, aldehydes, and alcohols. The degradation from C6 to C1 proceeds sequentially by alternating hydrolysis and photocatalytic oxidation.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Process Chemistry and Technology