Melem-derived poly(heptazine imide) for effective charge transport and photocatalytic reforming of cellulose into H2 and biochemicals under visible light

Bapurao Nimbalkar Dipak, Van Can Nguyen, Chun Yan Shih, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number121601
JournalApplied Catalysis B: Environmental
Volume316
DOIs
Publication statusPublished - 2022 Nov 5

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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