Li Heng, Zhang Chengzhong, Jiang Yuhang, Ni Wenwu, Li Mingshuo, Wang Jing
School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China.
Langmuir. 2025 Jul 1;41(25):16022-16032. doi: 10.1021/acs.langmuir.5c01157. Epub 2025 Jun 13.
Widespread dye contamination poses a serious threat to humans and aquatic environments. Metal-organic frameworks (MOFs) with abundant reactive groups and high specific surfaces are candidates for the adsorption of dyes. In this study, good growth of UiO-66-SOH crystals on the surface of nylon-6 fibers was achieved based on the idea of in situ growth. UiO-66-SOH with a sulfonic acid group was successfully introduced into nylon-6 electrostatic spinning fiber, and the UiO-66-SOH@nylon-6 membrane with high specific surface area and a three-dimensional mesh structure was obtained, which effectively solved the problems of clogging of the equipment, difficulty in being separated and recovered from the water, the possible secondary pollution of the water environment caused by the powder form of the MOF material, etc. The UiO-66-SOH@nylon-6 membrane has a good adsorption capacity for rhodamine B (RhB), and the experimental data are consistent with the pseudo-second-order kinetic model and Langmuir model, which shows that the adsorption is a spontaneous heat absorption process. Pore-filling, hydrogen bonding, π-π interactions, and electrostatic attraction induced by -SOH are the adsorption mechanisms of RhB on this adsorbent. In conclusion, the UiO-66-SOH@nylon-6 membrane is an adsorbent capable of rapid adsorption of RhB and can be easily separated from water for recovery, regeneration, and utilization. This study may provide ideas for the application of MOFs in the field of pollutant removal.
广泛存在的染料污染对人类和水生环境构成严重威胁。具有丰富反应基团和高比表面积的金属有机框架材料（MOFs）是吸附染料的候选材料。本研究基于原位生长的理念，在尼龙-6纤维表面实现了UiO-66-SOH晶体的良好生长。成功地将带有磺酸基团的UiO-66-SOH引入尼龙-6静电纺丝纤维中，得到了具有高比表面积和三维网状结构的UiO-66-SOH@尼龙-6膜，有效解决了设备堵塞、从水中分离回收困难、MOF材料粉末形式可能造成水环境二次污染等问题。UiO-66-SOH@尼龙-6膜对罗丹明B（RhB）具有良好的吸附性能，实验数据与准二级动力学模型和朗缪尔模型相符，表明吸附是一个自发吸热过程。孔隙填充、氢键、π-π相互作用以及由-SOH诱导的静电吸引是RhB在该吸附剂上的吸附机制。综上所述，UiO-66-SOH@尼龙-6膜是一种能够快速吸附RhB的吸附剂，且易于从水中分离以进行回收、再生和利用。本研究可为MOFs在污染物去除领域的应用提供思路。
