One-step synthesis of triazine-based covalent organic frameworks at room temperature for efficient photodegradation of bisphenol A under visible light irradiation

Abstract

Herein, a novel visible-light-responsive photocatalyst with high efficiency was firstly synthesized at room temperature. The mild synthetic method resulted in a uniform spherical triazine-based covalent organic framework (TrCOF2) with ultra-high specific surface area as well as chemical stability. Due to the synergistic effect between the self-assembled uniform spherical structure and the abundant triazine-based structure, photoelectron–hole pairs were efficiently separated and migrated on the catalysts. On this basis, TrCOF2 was successfully applied to efficiently degrade bisphenol A (BPA). More than 98% of BPA was deraded after 60 min of visible light treatment, where the active specie of •O₂ ⁻ played a vital role during the degradation of BPA. The holes of TrCOF2 could produce O₂ by direct reaction with water or hydroxide ions. Simultaneously, photoelectrons can be captured by O₂ to generate •O₂ ⁻. Moreover, density functional theory (DFT) calculations proved the outstanding ability of the exciting electronic conductivity. Remarkably, a reasonable photocatalytic mechanism for TrCOF2 catalysts was proposed. This research can provide a facile strategy for the synthesis of TrCOFs catalysts at room temperature, which unfolds broad application prospects in the environmental field.

Graphical abstract

Keywords

photocatalysis / triazine-based covalent organic framework / visible light / pollutant degradation / catalytic mechanism

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