Synthesis of adsorbents that simultaneously possess high adsorption performance and convenient separation characteristic remains a big challenge. Herein, we report a viable strategy to prepare hyperbranched polyglycerol (HPG)-based multi-carboxylic magnetic gel (MMG) based on the thiol-ene click chemistry. The obtained HPG-based MMG adsorbent with porous structure and multiple carboxylic groups not only exhibited fast adsorption rate, superior adsorption capacity, and favorable adsorption selectivity towards cationic dyes (e.g., methylene blue (MB) and methyl violet (MV)) but also presented convenient magnetic separation characteristic. The adsorption data showed nice correlation with pseudo-second-order kinetic model and Langmuir isotherm. The optimal adsorption capacity of HPG-based MMG for MB and MV can reach as high as 458.7 and 400.0 mg g⁻¹, respectively. Moreover, the dye-adsorbed HPG-based MMG could be regenerated in ethanol for reuse without obvious decline of removal efficiency. On the basis of the superior adsorption property of HPG-based MMG, this work offers an effective strategy to prepare advanced adsorbent for dye removal from wastewater.

同时具有高吸附性能和便利的分离特性的吸附剂的合成仍然是一个巨大的挑战。在这里，我们报告了一种可行的策略，基于硫醇-烯点击化学制备基于超支化聚甘油（HPG）的多羧酸磁性凝胶（MMG）。所获得的具有多孔结构和多个羧基的基于HPG的MMG吸附剂不仅表现出快速的吸附速率，优异的吸附能力和对阳离子染料（例如，亚甲基蓝（MB）和甲基紫（MV））的良好吸附选择性，而且还呈现出方便的磁选特性。吸附数据与拟二级动力学模型和Langmuir等温线显示出良好的相关性。基于HPG的MMG对MB和MV的最佳吸附能力可高达458.7和400.0 mg g^-1。而且，染料吸附的基于HPG的MMG可以在乙醇中再生以重复使用，而去除效率不会明显下降。在基于HPG的MMG优异的吸附性能的基础上，这项工作为制备高级吸附剂以去除废水中的染料提供了有效的策略。