Amide-linked covalent organic frameworks as efficient heterogeneous photocatalysts in water

doi:10.1016/S1872-2067(21)63836-6

Abstract

Abstract:

Semiconductor photocatalysts play an indispensable role in the photocatalytic process. Two-dimensional covalent organic frameworks (2D-COFs), as a kind of innovative photocatalyst, have garnered tremendous attention. Herein, we report an amide-linked 2D-COF (COF-JLU19) with outstanding photocatalytic performance in water, designed through a multi-synergistic approach. The synergistic effects of the high porosity, photoactive framework, high wettability, and stability of COF-JLU19 led to an unprecedented enhancement in the photocatalytic activity and recyclability in water upon illumination by visible light. More importantly, amide-linked 2D-COF based electrospinning membranes were prepared, which also exhibited superior photocatalytic activity for the degradation of Rhodamine B in water with sunlight. This study highlights the potential of the multi-synergistic approach as a universal rule for developing COF-based photocatalysts to address environmental and energy challenges.

Key words: Covalent organic frameworks, Multiple synergies, Photocatalysis, Porous materials, Dye degradation

Si Ma, Ziping Li, Ji Jia, Zhenwei Zhang, Hong Xia, He Li, Xiong Chen, Yanhong Xu, Xiaoming Liu. Amide-linked covalent organic frameworks as efficient heterogeneous photocatalysts in water[J]. Chinese Journal of Catalysis, 2021, 42(11): 2010-2019.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63836-6

https://www.cjcatal.com/EN/Y2021/V42/I11/2010

Figures/Tables 5

Scheme 1. (a) Syntheses of amide-linked 2D-COFs; Top (b) and side (d) views of COF-JLU17; Top (c) and side (e) views of COF-JLU19. (Color code: light gray, carbon; blue, nitrogen; red, oxygen; hydrogen is omitted for clarity).

Fig. 1. (a) FT-IR spectra of COFs before and after oxidation; (b,c) 13C CP-MAS NMR spectra of COF-JLU17 (cyan line) and COF-JLU19 (red line), and their chemical structures; (d) High-resolution N 1s XPS spectra of COF-JLU17 and COF-JLU19; (e) N2 sorption isotherm of COF-JLU18 and COF-JLU19 at 77 K (solid circles for adsorption and open circles for desorption); (f) Water vapor sorption isotherms of COF-JLU17 and COF-JLU19 at 298 K.

Fig. 2. XRD profiles of COF-JLU18 (a) and COF-JLU19 (b): experimentally observed (black), Pawley refinement (red), and their difference (blue) pattern simulated by using AA-stacking (green) model. SEM images of COF-JLU18 (c) and COF-JLU19 (d). TEM images of COF-JLU18 (e) and COF-JLU19 (f).

Fig. 3. (a) UV-vis spectra of RhB after adsorption by COF-JLU18 and at different irradiation times; (b) UV-vis spectra of RhB after adsorption by COF-JLU19 and at different irradiation times; the insets show optical photographs of the as-synthesized COF-JLU19 (top), COF-JLU19 after RhB adsorption (middle), and the unwashed COF-JLU19 after photocatalysis (bottom); (c) RhB degradation efficiency of recycled COF-JLU19 under visible-light irradiation; (d) Photodegradation profiles of RhB aqueous solution under irradiation with different light sources. SEM images of pure PAN membrane (e) and COF-JLU19@PAN membrane (0.65 wt% COF loading) (f); Photographs of aqueous solution of RhB before (g) and after (h) sunlight-driven photodegradation (Changchun, 08-2019, 25 ± 3 °C).

Fig. 4. (a) Transient photocurrent responses of amide-linked COF-JLUs under light illumination; (b) EIS Nyquist plots of COF-JLUs; (c) Photoluminescence decay traces of COF-JLUs; (d) Control experiments using COF-JLU19 under light irradiation; (e) EPR spectra of COF-JLU19 in the presence of DMPO as a radical scavenger under light illumination for different times; (f) Normalized absorption spectra of COF-JLUs; (g) Tauc plot of COF-JLUs; (h) VB-XPS spectra of COF-JLUs; (i) Band alignment of COF-JLUs, H2O/•OH and O2/O2•-.

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