Halloysite nanotubes (HNTs) as a natural and inexpensive clay mineral with hollow nanotubular structures, good biocompatibility and active surfaces have been ubiquitously applied in many fields. In this work, a novel multifunctional core-shell sorbent based on HNTs, CuCl₂-HNTs encapsulated magnetic microspheres (SiO₂@Fe₃O₄), was successfully fabricated and applied for Hg⁰ removal from flue gas with good performance for the first time. The core-shell structure prevented the composites from aggregating but kept their magnetism, which enabled the adsorbents being easily separated for reuse by an external magnetic field. In addition, the special structure also significantly enhanced the adsorption capacity of the composites by dispersing the CuCl₂ modified HNTs on the prepared magnetic microspheres. The adsorption performance was comprehensively investigated and fitted by dynamic models. The adsorption followed surface adsorption, particle diffusion and chemisorption with very good SO₂ tolerance. The Cu⁺, Cl^- and lattice oxygen were the crucial components for Hg⁰ removal. In order to further understand the possible mechanism, an online home-made coupling system of temperature-programmed decomposition (TPD) was used to investigate the mercury species on the spent adsorbent in addition to X-ray photoelectron spectroscopy analysis. The results confirmed the mercury species adsorbed were primarily Hg⁰, HgO and HgCl₂.

埃洛石纳米管（HNTs）是一种天然且廉价的具有空心纳米管结构，良好的生物相容性和活性表面的粘土矿物，已广泛应用于许多领域。在这项工作中，成功地制备了一种新型的基于HNTs的多功能核壳吸附剂，即CuCl ₂ -HNTs包裹的磁性微球（SiO ₂ @Fe ₃ O ₄），并用于Hg ⁰首次从烟气中去除，性能良好。核-壳结构阻止了复合材料的聚集，但保持了磁性，这使得吸附剂易于分离，以通过外部磁场再利用。此外，特殊结构还通过将CuCl ₂改性的HNTs分散在制备的磁性微球上来显着提高了复合材料的吸附能力。通过动态模型对吸附性能进行了全面研究和拟合。吸附遵循表面吸附，颗粒扩散和化学吸附，并具有很好的SO ₂耐受性。在Cu ⁺，氯^-和晶格氧是关键部件对Hg ⁰去除。为了进一步了解可能的机理，除了X射线光电子能谱分析外，还使用了在线自制的程序升温分解（TPD）耦合系统来研究废吸附剂上的汞种类。结果证实，所吸附的汞主要为Hg ⁰，HgO和HgCl ₂。