Organic phenolic pollutants in industrial wastewater cause severe environmental pollution and physiological damage. Poly (N-isopropylacrylamide) (PNIPAM) hydrogels generally have poor mechanical strength and are also intrinsically frangible, limiting their widespread applications in wastewater treatment. Combining them with 2-dimensional materials can also only improve the mechanical properties of hydrogels. Here, we report a high-strength, chemical stability and strong adsorption MXene/poly (N-isopropylacrylamide) (PNIPAM) thermosensitive composite hydrogel for efficient removal of phenolic pollutants from industrial wastewater. Ionic liquids (ILs) were grafted onto the surface of MXenes and introduced into NIPAM monomer solution to obtain composite hydrogels by in-situ polymerization for improved mechanical strength and adsorption capacity of the composite hydrogel. Compared with the MXene/PNIPAM composite hydrogel, the introduction of ILs simultaneously improves the mechanical and adsorption properties of the composite hydrogel. The ILs bind to the surface of MXene flakes through electrostatic interactions, which improved the thermal stability and oxidation resistance of MXenes while maintaining its good dispersion. Using 1-Ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) modified MXene (MXene-EMIMBF4) did not change significantly were observed after aging for 45 days. As-prepared composite hydrogels demonstrated excellent mechanical properties, reusability, and high adsorption capacity for p-Nitrophenol (4-NP). The MXene-EMIMBF4/PNIPAM hydrogel could recover after ten 95% strain compression cycles under the synergistic effect of chemical bonding and electrostatic attraction. Its maximum adsorption capacity for 4-NP was 200.29 mg g⁻¹ at room temperature, and the adsorption capacity maintained at ∼90% of its initial value after five adsorption cycles, which was related to the introduction of EMIMBF4 to form a denser network structure. The adsorption data followed the pseudo-second-order kinetics and Freundlich models.

工业废水中的有机酚类污染物造成严重的环境污染和生理损害。聚 ( N-异丙基丙烯酰胺) (PNIPAM) 水凝胶通常具有较差的机械强度并且本质上也是易碎的，限制了它们在废水处理中的广泛应用。将它们与二维材料结合也只能提高水凝胶的机械性能。在这里，我们报告了一种高强度、化学稳定性和强吸附性的 MXene/聚（N-异丙基丙烯酰胺）（PNIPAM）热敏复合水凝胶，用于有效去除工业废水中的酚类污染物。将离子液体（ILs）接枝到MXenes表面并引入NIPAM单体溶液中，通过原位获得复合水凝胶聚合以提高复合水凝胶的机械强度和吸附能力。与 MXene/PNIPAM 复合水凝胶相比，ILs 的引入同时提高了复合水凝胶的机械性能和吸附性能。ILs通过静电相互作用与MXene薄片表面结合，提高了MXenes的热稳定性和抗氧化性，同时保持了良好的分散性。使用 1-乙基-3-甲基咪唑鎓四氟硼酸盐 (EMIMBF4) 改性的 MXene (MXene-EMIMBF4) 在老化 45 天后未观察到显着变化。所制备的复合水凝胶表现出优异的机械性能、可重复使用性和对p的高吸附能力-硝基苯酚（4-NP）。在化学键合和静电引力的协同作用下，MXene-EMIMBF4/PNIPAM 水凝胶在 10 个 95% 的应变压缩循环后可以恢复。其对4-NP的最大吸附量在室温下为200.29 mg g ^-1，经过5个吸附循环后吸附量保持在初始值的~90%，这与EMIMBF4的引入形成更致密的网络结构有关. 吸附数据遵循准二级动力学和 Freundlich 模型。