Dual-defect-modified graphitic carbon nitride with boosted photocatalytic activity under visible light.

Autor: Katsumata H; Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie, 514-8507, Japan. hidek@chem.mie-u.ac.jp., Higashi F; Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie, 514-8507, Japan., Kobayashi Y; Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie, 514-8507, Japan., Tateishi I; Mie Global Environment Center for Education & Research, Mie University, Tsu, Mie, 514-8507, Japan., Furukawa M; Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie, 514-8507, Japan., Kaneco S; Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie, 514-8507, Japan.; Mie Global Environment Center for Education & Research, Mie University, Tsu, Mie, 514-8507, Japan.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2019 Oct 16; Vol. 9 (1), pp. 14873. Date of Electronic Publication: 2019 Oct 16.
DOI: 10.1038/s41598-019-49949-6
Abstrakt: The development of photocatalysts that efficiently degrade organic pollutants is an important environmental-remediation objective. To that end, we report a strategy for the ready fabrication of oxygen-doped graphitic carbon nitride (CN) with engendered nitrogen deficiencies. The addition of KOH and oxalic acid during the thermal condensation of urea led to a material that exhibits a significantly higher pseudo-first-order rate constant for the degradation of bisphenol A (BPA) (0.0225 min -1 ) compared to that of CN (0.00222 min -1 ). The enhanced photocatalytic activity for the degradation of BPA exhibited by the dual-defect-modified CN (Bt-OA-CN) is ascribable to a considerable red-shift in its light absorption compared to that of CN, as well as its modulated energy band structure and more-efficient charge separation. Furthermore, we confirmed that the in-situ-formed cyano groups in the Bt-OA-CN photocatalyst act as strong electron-withdrawing groups that efficiently separate and transfer photo-generated charge carriers to the surface of the photocatalyst. This study provides novel insight into the in-situ dual-defect strategy for g-C 3 N 4 , which is extendable to the modification of other photocatalysts; it also introduces Bt-OA-CN as a potential highly efficient visible-light-responsive photocatalyst for use in environmental-remediation applications.
Databáze: MEDLINE
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