Environmental concerns associated with the efficient defluoridation of contaminated water remain a substantial challenge. In this work, a new nanocomposite, UiO-66-NH₂@PS⁺, was successfully fabricated via in situ precipitation of a water-stable metal–organic framework (UiO-66-NH₂) inside a commercial polystyrene anion exchanger PS⁺. The as-formed nanocomposite UiO-66-NH₂@PS⁺ was characterized using various morphological methods, which demonstrated that nanosized UiO-66-NH₂ was homogenously dispersed within the inner pores of PS⁺. Batch adsorption experiments indicated that UiO-66-NH₂@PS⁺ exhibited outstanding adsorption performance for fluoride over a broad pH range of 3.0–8.0. The saturated adsorption capacity of fluoride at 298 K was 27.5 and 32.8 mg/g for pH 6.5 and 4.5 with the adsorbent dosage of 0.5 g/L and initial concentration of 5–80 mg/L. Moreover, the utilization rate of active adsorption sites of UiO-66-NH₂ was greatly improved after encapsulation. The XPS study indicated that the integrated effects of specific inner-sphere coordination and ligand exchange between fluoride and UiO-66-NH₂ might be the dominant adsorption mechanism. Fixed-bed tests indicated that the UiO-66-NH₂@PS⁺ column could successively produce clean water with bed volumes of 350 and 70 ([F⁻] <1.5 mg/L) from simulated fluoride-pollution water at pH 4.5 and 8.0, with a liquid velocity of 20 mL/h, and an empty bed contact time (EBCT) of 15 min, which was higher than that of the other materials. In addition, the exhausted UiO-66-NH₂@PS⁺ was regenerated and reused for 5 times through complete regeneration, highlighting the potential feasibility of defluorination in practical applications.

与污染水的有效除氟相关的环境问题仍然是一个重大挑战。在这项工作中，一种新的纳米复合材料 UiO-66-NH ₂ @PS ⁺是通过在商业聚苯乙烯阴离子交换剂 PS ^+内原位沉淀水稳定的金属有机骨架 (UiO-66-NH ₂ ) 成功制备的。 . 使用各种形态学方法对所形成的纳米复合材料 UiO-66-NH ₂ @PS ⁺进行了表征，这表明纳米尺寸的 UiO-66-NH _{2均匀分散在 PS} ⁺的内孔中。批量吸附实验表明，UiO-66-NH ₂@PS ⁺在 3.0-8.0的宽 pH 范围内表现出出色的氟化物吸附性能。在 298 K 和 pH 6.5 和 4.5 条件下，氟化物的饱和吸附容量分别为 27.5 和 32.8 mg/g，吸附剂用量为 0.5 g/L，初始浓度为 5-80 mg/L。_{此外，包封后UiO-66-NH 2}活性吸附位点的利用率大大提高。XPS研究表明，氟化物与UiO-66-NH ₂之间特定的内球配位和配体交换的综合作用可能是主要的吸附机制。固定床测试表明，UiO-66-NH ₂ @PS ⁺柱可以连续生产床体积为 350 和 70 ([F ^-] <1.5 mg/L) 模拟氟化物污染水，pH 4.5 和 8.0，液速 20 mL/h，空床接触时间 (EBCT) 15 min，高于其他材料。此外，用尽的UiO-66-NH ₂ @PS ⁺完全再生后可再生利用5次，凸显了脱氟在实际应用中的潜在可行性。