In this work, a highly efficient adsorbent based on ionic liquid functionalized MXene has been fabricated through the combination of mussel-inspired chemistry and Michael addition reaction. The surface of MXene was first coated with polydopamine (PDA) through self-polymerization of dopamine and the amino groups were introduced on the surface of MXene simultaneously. After that, the ene bond-containing ionic liquid was further immobilized on the surface of MXene-PDA to obtain MXene-PDA-IL. As a concept, the adsorptive removal of iodine using MXene-PDA-IL was conducted and the effects of various factors on the adsorption behavior were examined. The experimental data were analyzed by intermittent adsorption experiments, the adsorption kinetics, adsorption isotherm, adsorption thermodynamics, and cyclic adsorption experiments. We found that the adsorption procedure could reach equilibrium within 10 min after mixing adsorbent and iodine. The maximum adsorption capacity of MXene-PDA-IL towards iodine was as high as 695.4 mg g⁻¹, which is greater than most of reported adsorbents. Considered the advantages of mussel-inspired chemistry for surface functionalization and the adsorption capacity of ionic liquids, the method could be used for construct a number of composites with potential for adsorption applications.

在这项工作中，通过结合贻贝化学和迈克尔加成反应制备了一种基于离子液体功能化 MXene 的高效吸附剂。MXene 的表面首先通过多巴胺的自聚合被聚多巴胺 (PDA) 包覆，同时在 MXene 的表面引入氨基。之后，将含烯键的离子液体进一步固定在MXene-PDA表面，得到MXene-PDA-IL。作为一个概念，使用 MXene-PDA-IL 进行了碘的吸附去除，并检查了各种因素对吸附行为的影响。通过间歇吸附实验、吸附动力学、吸附等温线、吸附热力学和循环吸附实验对实验数据进行了分析。我们发现，吸附剂和碘混合后，吸附过程可以在 10 分钟内达到平衡。MXene-PDA-IL对碘的最大吸附容量高达695.4 mg/g^-1，大于大多数报道的吸附剂。考虑到贻贝化学在表面功能化和离子液体吸附能力方面的优势，该方法可用于构建许多具有吸附应用潜力的复合材料。