Hollow porous carbon nitride nanotubes with efficient photocatalytic H2O2 generation in pure water
Issued Date
2026-01-01
Resource Type
ISSN
20403364
eISSN
20403372
Scopus ID
2-s2.0-105036646540
Journal Title
Nanoscale
Rights Holder(s)
SCOPUS
Bibliographic Citation
Nanoscale (2026)
Suggested Citation
Sudrajat H., Susanti A., Phanthuwongpakdee J., Asnal M. Hollow porous carbon nitride nanotubes with efficient photocatalytic H2O2 generation in pure water. Nanoscale (2026). doi:10.1039/d6nr00414h Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/116522
Title
Hollow porous carbon nitride nanotubes with efficient photocatalytic H2O2 generation in pure water
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Corresponding Author(s)
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Abstract
Hydrogen peroxide (H<inf>2</inf>O<inf>2</inf>) is an important green oxidant. However, its industrial production remains energy-intensive and environmentally burdensome. Photocatalytic generation of H<inf>2</inf>O<inf>2</inf> from O<inf>2</inf> and water under visible-light irradiation is an attractive alternative, yet its efficiency is often limited by sluggish oxygen activation and severe charge recombination. Here, we report a triazine-based graphitic carbon nitride material featuring a hollow, porous nanotube morphology, synthesized via a straightforward, salt-free approach. This method produces a narrow mesopore size distribution without the use of templates or structure-directing agents. The resulting photocatalyst exhibits enhanced visible-light absorption, a high specific surface area, and restricted charge recombination. In comparison with a heptazine-based analogue, the triazine nanotubes exhibit stronger O<inf>2</inf> adsorption and a more negative conduction-band potential, thereby facilitating a thermodynamically more favorable reduction of O<inf>2</inf> to H<inf>2</inf>O<inf>2</inf>. Their electrons are also more reactive due to higher mobility, thus allowing for rapid reaction with O<inf>2</inf>. Under visible-light irradiation (λ > 390 nm), an H<inf>2</inf>O<inf>2</inf> production rate of 115 μM h<sup>−1</sup> is achieved in pure water under O<inf>2</inf> flow, without the use of sacrificial reagents and cocatalysts. The triazine sample achieves an AQY of 1% at 420 nm in pure water. Mechanistic investigations indicate that H<inf>2</inf>O<inf>2</inf> formation predominantly proceeds via a superoxide-mediated one-electron oxygen reduction pathway.