17β-estradiol (E2), as one of the pharmaceutical and personal care product, frequently contaminates environmental water as estrogen pollutant and possesses great risk to human survival as well as the sustainable development of the ecosystem. Herein, to achieve an effective adsorbent system for the selective removal of E2 from the environmental water, Fe₃O₄ nanoparticles are subjected to chemical etching to reduce the overall mass and then employed as carriers to prepare a novel type of lightweight daisy-like magnetic molecularly imprinted polymers (LD-MMIPs) adopting template immobilization strategy. The LD-MMIPs based etched magnetic nanoparticles not only exhibit light mass but also have plentiful imprinted sites in the etched channels, which significantly increases the adsorption capacity for E2. The daisy-like LD-MMIPs own strong magnetic responsiveness, well crystallinity, fast binding kinetics, high adsorption amount, and excellent selectivity. Moreover, combining with HPLC, the LD-MMIPs as adsorbents have been successfully used to specifically recognize and detect trace E2 in environmental water. Thus, the proposed LD-MMIPs with high adsorption capacity hold great potential in monitoring water pollution. Additionally, this work also provides an alternative strategy for improving the adsorption capacity of magnetic molecularly imprinted polymers through a convenient chemical etching technology.

17β-雌二醇（E2）作为医药和个人护理产品之一，经常作为雌激素污染物污染环境水体，对人类生存和生态系统的可持续发展具有很大的风险。在此，为了实现从环境水中选择性去除 E2 的有效吸附剂系统，Fe ₃ O ₄纳米粒子经过化学蚀刻以减少整体质量，然后用作载体，采用模板固定策略制备新型轻质雏菊状磁性分子印迹聚合物（LD-MMIP）。基于 LD-MMIPs 的蚀刻磁性纳米粒子不仅质量轻，而且在蚀刻通道中具有丰富的印迹位点，这显着提高了 E2 的吸附能力。菊花状LD-MMIPs具有强磁响应性、良好的结晶度、快速的结合动力学、高吸附量和优异的选择性。此外，结合高效液相色谱法，LD-MMIPs作为吸附剂已成功用于特异性识别和检测环境水中的痕量E2。因此，所提出的具有高吸附能力的LD-MMIP在监测水污染方面具有巨大潜力。此外，这项工作还为通过方便的化学蚀刻技术提高磁性分子印迹聚合物的吸附能力提供了一种替代策略。