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Hydrophilic hydrogen-bonded organic frameworks/g-C3N4 all-organic Z-scheme heterojunction for efficient visible-light photocatalytic hydrogen production and dye degradation by Haixian Shi; Dengchong Feng; Hanmei Li; Dingshan Yu; Xudong Chen is a Materials Science article available to read on EtoBox.

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Herein, a novel all-organic Z-scheme hydrogen-bonded organic frameworks (HOFs)/g-C3N4 nanosheets (CNNS) heterojunction photocatalyst is synthesized through an in-situ electrostatic method. Characterization and density functional theory studies together verify that the band structures with staggered alignment between HOFs and CNNS can induce a rapid Z-scheme interfacial charge-transfer pathway. Combing the complementary advantages of HOFs and CNNS, the fabricated Z-scheme HOFs/CNNS heterojunction inhibits photoinduced electron-hole recombination and more charge carriers are accumulated to produce highly reactive substances (•O2 –, •OH and h+). In addition, the superior hydrophilicity of HOFs can enhance the interaction of HOFs/CNNS heterojunction with water molecules and methyl orange pollutant, which is beneficial to boosting photocatalytic activity. Therefore, in contrast to inactive pure HOFs, the novel Z-scheme HOFs/CNNS heterojunction exhibits a high photocatalytic hydrogen evolution rate of 4450 μmol h-1g−1 with an apparent quantum efficiency (AQY) of 22 % at 450 nm, which is approximately 11 times higher than that of pure CNNS. Additionally, such heterojunction enables 100 %

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Author

Haixian Shi; Dengchong Feng; Hanmei Li; Dingshan Yu; Xudong Chen

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)