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In this study, fluorine-defective covalent triazine frameworks (CTFs) were designed and synthesized to improve adsorption performance for per-and polyfluoroalkyl substances (PFAS). Compared with pristine CTFs, the fluorine-defective CTFs exhibited a 55% increase in adsorption capacity. A systematic evaluation of different particle sizes revealed that CTF-F10 (246.421mg/g) achieved a 59% higher capacity than CTF-F595 (154.403mg/g). These results demonstrate that reducing the adsorbent particle size not only substantially increases the equilibrium adsorption capacity, but also accelerates the adsorption rate. At pH 2, CTF-F10 achieved a C7HFPO-TA removal efficiency of 89.55%, significantly higher than that at pH 6 (50.15%) and pH 10 (26.35%). The presence of NaCl or fulvic acid (FA) reduced removal efficiency by about 20%. DFT calculations indicated that the adsorption of C7HFPO-TA onto fluorine-defective CTFs is primarily governed by electrostatic and fluorophilic interactions. Regeneration experiments also excellent recyclability and reusability of powdered CTFs. This work establishes a novel design strategy for fluorine-defective CTFs for PFAS removal from water and provides a first comparative evaluation of the particle size effects on C7HFPO-TA adsorption, providing scientific and technical guidance for mitigating PFAS contamination in aquatic environments.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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