Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China.
Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China.
Environ Res. 2024 Feb 1;242:117568. doi: 10.1016/j.envres.2023.117568. Epub 2023 Nov 16.
Phenols, dyes, and metal ions present in industrial wastewater can adversely affect the environment and leach biological carcinogens. Given that the current research focuses only on the removal of one or two of those categories. Herein, this work reports a novel ZIF-8@IL-MXene/Poly(N-isopropylacrylamide) (NIPAM) nanocomposite hydrogel that can efficiently and conveniently absorb and separate multiple pollutants from industrial wastewater. Ionic liquid (IL) was grafted onto MXene surfaces using a one-step method, and then incorporated into NIPAM monomer solutions to obtain the IL-MXene/PNIPAM composite hydrogel via in-situ polymerization. ZIF-8@IL-MXene/PNIPAM nanocomposite hydrogels were obtained by in-situ growth of ZIF-8 on the pore walls of composite hydrogels. As-prepared nanocomposite hydrogel showed excellent mechanical properties and can withstand ten repeated compressions without any damage, the specific surface area increased by 100 times, and the maximum adsorption capacities for p-nitrophenol (4-NP), crystal violet (CV), and copper ion (Cu) were 198.40, 325.03, and 285.65 mg g, respectively, at room temperature. The VPTTs of all hydrogels ranged from 33 to 35 °C, so the desorption process can be achieved in deionized water at 35-40 °C, and its adsorption capacities after five adsorption-desorption cycles decreased to 79%, 91%, and 29% for 4-NP, CV, and Cu, respectively. The adsorption data fitting results follow pseudo-second-order kinetics and Freundlich models, which is based on multiple interactions between the functional groups contained in hydrogels and adsorbent molecules. The hydrogel is the first to realize the high-efficiency adsorption of phenols, dyes and metal ions in industrial wastewater simultaneously, and the preparation process of hydrogels is environmentally friendly. Also, giving hydrogel multifunctional adsorption is beneficial to promote the development of multifunctional adsorption materials.
酚类、染料和金属离子存在于工业废水中会对环境造成不利影响，并浸出生物致癌物质。鉴于目前的研究仅集中在去除这些类别中的一种或两种，因此，本工作报道了一种新型 ZIF-8@IL-MXene/聚（N-异丙基丙烯酰胺）（NIPAM）纳米复合水凝胶，它可以从工业废水中高效、方便地吸收和分离多种污染物。通过一步法将离子液体（IL）接枝到 MXene 表面，然后将其掺入 NIPAM 单体溶液中，通过原位聚合获得 IL-MXene/PNIPAM 复合水凝胶。通过在复合水凝胶的孔壁上原位生长 ZIF-8 获得 ZIF-8@IL-MXene/PNIPAM 纳米复合水凝胶。所制备的纳米复合水凝胶具有优异的机械性能，可承受十次重复压缩而无任何损坏，比表面积增加了 100 倍，对 p-硝基苯酚（4-NP）、结晶紫（CV）和铜离子（Cu）的最大吸附容量分别为 198.40、325.03 和 285.65mg/g，在室温下。所有水凝胶的 VPTT 范围为 33 至 35°C，因此，在 35-40°C 的去离子水中可以实现解吸过程，其在五次吸附-解吸循环后的吸附容量分别降低至 4-NP、CV 和 Cu 的 79%、91%和 29%。吸附数据拟合结果符合准二级动力学和 Freundlich 模型，这是基于水凝胶和吸附剂分子中所含官能团之间的多种相互作用。该水凝胶是第一个同时实现工业废水中酚类、染料和金属离子高效吸附的水凝胶，且水凝胶的制备过程环保。此外，赋予水凝胶多功能吸附有利于促进多功能吸附材料的发展。
