A novel hyper-crosslinked triazine-based COF (HCTF-2) photocatalyst was prepared by a simple molecular expansion method. Compared with CTF-2, HCTF-2 showed excellent photocatalytic performance under visible light irradiation. The photodegradation efficiency of HCTF-2 for some pollutants (20 ppm tetracycline (TC), 30 ppm rhodamine B (RhB), 20 ppm levofloxacin hydrochloride (LEF) and 20 ppm methylene blue (MB)) can reach more than 99% in a short time. Meanwhile, HCTF-2 had a stronger hydrogen production rate (2728.61 μmol h⁻¹ g⁻¹), which was 5.11 times higher than that of CTF-2 (534.12 μmol h⁻¹ g⁻¹). Molecular oxygen activation experiments confirmed that HCTF-2 exhibited strong oxidation capacity for 3,3′,5,5′-tetramethylbenzidine (TMB), and superoxide radical and hydrogen peroxide generation ability. The photodegradation active species were identified through free radical trapping experiments and ESR. Moreover, the possible degradation pathways of LEF were analyzed by liquid chromatography-mass spectrometry (LC-MS). The enhanced photocatalytic ability of HCTF-2 was attributed to the strong absorption of visible light and the porous braided structure leading to a larger specific surface area with higher carrier separation efficiency. This research provided a strategy for the development of specially structured COFs for photocatalytic applications and more efficient improvement of photocatalytic efficiency.

中文翻译：

---

通过分子膨胀构建新型超交联三嗪COF以增强可见光下的光催化性能

通过简单的分子膨胀方法制备了一种新型超交联三嗪基COF（HCTF-2）光催化剂。与CTF-2相比，HCTF-2在可见光照射下表现出优异的光催化性能。 HCTF-2对某些污染物（20 ppm四环素（TC）、30 ppm罗丹明B（RhB）、20 ppm盐酸左氧氟沙星（LEF）和20 ppm亚甲蓝（MB））的光降解效率可达99%以上。短时间。同时，HCTF-2具有更强的产氢速率（2728.61 μmol h ^-1 g ^-1），是CTF-2（534.12 μmol h ^-1 g ^-1）的5.11倍。分子氧活化实验证实HCTF-2对3,3',5,5'-四甲基联苯胺(TMB)具有很强的氧化能力，以及产生超氧自由基和过氧化氢的能力。通过自由基捕获实验和ESR 鉴定了光降解活性物质。此外，通过液相色谱-质谱法（LC-MS）分析了LEF可能的降解途径。 HCTF-2增强的光催化能力归因于对可见光的强烈吸收以及多孔编织结构导致更大的比表面积和更高的载流子分离效率。该研究为开发用于光催化应用的特殊结构COF以及更有效地提高光催化效率提供了策略。