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

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摘要

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.

原文English
文章編號121601
期刊Applied Catalysis B: Environmental
316
DOIs
出版狀態Published - 2022 11月 5

All Science Journal Classification (ASJC) codes

  • 催化
  • 環境科學 (全部)
  • 製程化學與技術

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