Co-regulation of microstructure and intrinsic groups in carbon nitride to achieve high-efficient pollutant degradation under visible light: Roles of N species

[Display omitted] •CN composites with different morphologies were successfully prepared through the regulation of N species.•Co-existence of N vacancy and -NHx groups effectively accelerate separation of carriers.•The synergistic effect enhancing the adsorption and electron transfer of O2 to produce...

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Veröffentlicht in:Separation and purification technology 2025-02, Vol.354, p.129392, Article 129392
Hauptverfasser: Zhou, Huajing, He, Xinan, Chen, Faze, Deng, Xiaoyong, He, Liang, Zhao, Lingxiang, Liu, Zilian, Guan, Qingqing
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Sprache:eng
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Zusammenfassung:[Display omitted] •CN composites with different morphologies were successfully prepared through the regulation of N species.•Co-existence of N vacancy and -NHx groups effectively accelerate separation of carriers.•The synergistic effect enhancing the adsorption and electron transfer of O2 to produce O2·-.•Degradation mechanism and ecotoxicity of TC were detailed. Owing to the drawback of the lower separation and shorter lifetime of carriers in carbon nitride (CN), this study reported that the CN composites with different morphologies and the N species were successfully synthesized through the regulation of intrinsic functional groups. Results showed that the formed tubular structure in 1D CN nanotubes (1D CNNTs) could intensify the utilization of visible light (Vis) because of the multiple diffraction or scattering of light, bridge the mass transfer distance and provide more active sites. Meanwhile, 1D CNNTs showed excellent TC degradation rates (0.3777 min-1) under Vis, which were 13, 630 and 6-36 times higher than these of two-dimensional CN nanosheets, three-dimensional CN microspheres and reported CN based catalysts, respectively. The analysis of active species showed O2·- and h+ were the main active species for TC degradation. The degradation pathways and comprehensive toxicities of TC were also comprehensively analyzed. Theoretical calculation exhibited that the introduction of N vacancy and -NHx groups effectively accelerating separation of carriers, prolonging carrier lifetime and enhancing the adsorption ability and relative electron transfer of O2 to the production of O2·-. In addition, the prepared catalysts presented better stability and anti-interference ability. Therefore, this study would provide a new view for regulation of intrinsic functional groups in CN to achieve efficient pollutant degradation under Vis.
ISSN:1383-5866
DOI:10.1016/j.seppur.2024.129392