A novel triazine-based structured two-dimensional (2D) covalent organic framework (COF), known as TRITER-1, has been prepared through the Schiff-base condensation reaction between terephthalaldehyde and 1,3,5-tris(4-aminophenyl)triazine. Additionally, g-C₃N₄ has been incorporated within imine-based covalent organic frameworks to produce the composite known as TRITER-1@g-C₃N₄, which has a relatively small band gap of 2.0 eV. This composite, called TRITER-1@g-C₃N₄, has been synthesized and effectively used toward the light-driven formation of methanol from the most greenhouse gas CO₂. This highly crystalline organic polymeric material demonstrated an outstanding photocatalytic activity. The active photocatalyst TRITER-1@g-C₃N₄ composite successfully reduces CO₂ into methanol under ambient reaction conditions in the presence of NiO nanoparticles as a cocatalyst under atmospheric pressure. The visible-light-accelerated metal-free CO₂ reduction into methanol by this COF composite has been accomplished under 15 W of a white LED light illumination, with a maximum turnover number of (TON = 172, μmol = 22 600). By varying the light intensity, it was clear that the reaction failed to take place in the absence of a white LED. We proved that sunlight can also produce a TON of around 73 under conditions that allow for sustainable reactions. This catalyst retains its catalytic function after being regenerated multiple times and is effective and selective.

中文翻译：

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高效共价有机骨架 g-C3N4 复合材料作为可重复使用的光催化剂，在光介导下将二氧化碳可持续转化为有价值的甲醇

通过对苯二甲醛和1,3,5-三(4-氨基苯基)之间的希夫碱缩合反应制备了一种新型三嗪基结构二维(2D)共价有机骨架(COF)，称为TRITER-1三嗪。此外，gC ₃ N ₄已被纳入基于亚胺的共价有机骨架中，以产生称为TRITER-1@gC ₃ N ₄的复合材料，其具有相对较小的带隙（2.0 eV）。这种复合材料被称为 TRITER-1@gC ₃ N ₄，已被合成并有效地用于光驱动从大多数温室气体 CO ₂中形成甲醇。这种高度结晶的有机聚合物材料表现出出色的光催化活性。活性光催化剂TRITER-1@gC ₃ N ₄复合材料在大气压力下，在NiO纳米颗粒作为助催化剂的存在下，在环境反应条件下成功地将CO ₂还原为甲醇。该COF复合材料在15 W白光LED光照射下实现了可见光加速的无金属CO ₂还原为甲醇，最大周转数为(TON = 172，μmol = 22 600)。通过改变光强度，很明显，在没有白色 LED 的情况下，反应无法发生。我们证明，在允许可持续反应的条件下，阳光也可以产生约 73 TON 的能量。该催化剂经多次再生后仍能保持其催化功能，且具有高效性和选择性。