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Surface modification of porous g-C3N4 materials using a waste product for enhanced photocatalytic performance under visible light

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Abstract

A facile and low-cost g-C3N4 surface modification approach using a biomass-derived liquid product is proposed in this work. Through the incorporation of renewable and sustainable bio-oil that is generated from a solar powered waste biomass pyrolysis, the surface functionality of a pristine g-C3N4 material is modified with functional groups that are of electron-withdrawing character, leading to the improvement of the photocatalytic hydrogen evolution rate for the modified C3N4 sample. At low reaction temperature (120 °C), the sample is modified through a cleavage of C–N bonds between three heptazine fragments and tertiary nitrogen, followed by the bonding of oxygenated functional groups. As the reaction temperature increases further to a higher temperature (180 °C), a partial de-aromatization of the triazine network in the C3N4 sample due to the intercalation of functional groups from this post-synthesis bio-oil modification is further observed. The remarkable hydrogen evolution rate of the modified C3N4 sample higher than that of pristine g-C3N4 is observed, attributed to the synergistic effects of the extended visible light response, better separation of the photogenerated charge carriers and the enlarged specific surface area.

Graphical abstract: Surface modification of porous g-C3N4 materials using a waste product for enhanced photocatalytic performance under visible light

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Publication details

The article was received on 26 Jul 2019, accepted on 19 Sep 2019 and first published on 26 Sep 2019


Article type: Paper
DOI: 10.1039/C9GC02631B
Green Chem., 2019, Advance Article

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    Surface modification of porous g-C3N4 materials using a waste product for enhanced photocatalytic performance under visible light

    T. Jiang, S. Liu, Y. Gao, A. H. Rony, M. Fan and G. Tan, Green Chem., 2019, Advance Article , DOI: 10.1039/C9GC02631B

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