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2D graphitic-C3N4 hybridized with 1D flux-grown Na-modified K2Ti6O13 nanobelts for the enhanced simulated sunlight and visible-light photocatalytic performance

Abstract

Two-dimensional (2D) graphitic-C3N4 (g-C3N4) was successfully hybridized with the one-dimensional (1D) flux-grown Na-modified K2Ti6O13 nanobelts (Na-K2Ti6O13 NBs) for the first time to construct novel 1D/2D Na-K2Ti6O13/g-C3N4 heterostructure photocatalysts using a facile mixing-calcination method. The heterostructured Na-K2Ti6O13/g-C3N4 composites with three-dimensional (3D) hybrid architectures exhibited a remarkably enhanced photocatalytic efficiency for organic pollutant degradation in comparison with pure Na-K2Ti6O13 and g-C3N4 under both simulated sunlight and visible-light irradiation (λ> 420 nm), which could be mainly attributed to the synergistic effects between Na-K2Ti6O13 and g-C3N4 including more efficient interfacial charge transfer, longer lifetime and stronger oxidation and reduction ability of photogenerated charge carriers, fundamentally originating from the formation of Na-K2Ti6O13/g-C3N4 heterojunctions based on the well-matched energy-band structures. Moreover, the Na-K2Ti6O13/g-C3N4 hybrids showed good stability and reusability for photocatalytic degradation of organic pollutant. Finally, the possible mechanisms responsible for the improved simulated sunlight and visible-light photocatalytic performance were also investigated respectively, based on the results of PL spectra, time-resolved fluorescence decay spectra, radical species trapping experiments, ESR spectra and PL-TA measurements. Overall, this work will be not only beneficial for the design and development of more efficient visible-light-responsive g-C3N4-based composites for solar energy conversion and environmental remediation, but also be influential in optimizing the visible-light photocatalytic activity of the wide-band-gap 1D titanate nanomaterials to meet the requirements of practical applications.

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Publication details

The article was received on 06 Jun 2017, accepted on 08 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7CY01134B
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    2D graphitic-C3N4 hybridized with 1D flux-grown Na-modified K2Ti6O13 nanobelts for the enhanced simulated sunlight and visible-light photocatalytic performance

    Q. Wang, 士. 关 and B. Li, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01134B

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