Activated-carbon supported two dimensional covalent organic frameworks for high-efficient coenzyme photo-regeneration

Two dimensional covalent organic frameworks (COFs) represent a promising category of photocatalysts for coenzyme regeneration. Nevertheless, the block structure inherent in COFs leads to a high complexation rate of the photogenerated carriers and low catalytic efficiency. These challenges can be mitigated by judicious selection of supporting material, on which COFs can be deposited and stripped into two dimensional layers with the assistance of acetic acid. In this work, five kinds of supporting materials were investigated and compared for the loading of a visible-light responsive COFs, TP-TTA, including activated carbon (AC), SiO₂, porous carbon nitride, MoS₂, and Ti₃C₂. The morphologies, structures, optical and photocatalytic properties of composites were characterized. The findings reveal that AC emerged as the optimal supporting material and TP-TTA/AC exhibited the largest specific surface area, the highest loading amount of TP-TTA, the lowest complexation rate of the photogenerated carriers, and the most prominent photocatalytic performance. Furthermore, the preparation conditions of TP-TTA/AC were optimized, including the addition amount and time of AC, pH value. Under the optimal conditions, the catalytic activity of TP-TTA/AC and the yield of coenzyme regeneration reached 7.08 mmol/(g⋅h) and 90.3 %, while it was separately 0.114 mmol/(g⋅h) and 26.1 % for TP-TTA.