Adsorbent with high efficiency, fast removal rate and good reusability is very important for arsenic remediation. Herein, a novel porous magnetic nanocomposite was prepared for efficient arsenic removal by simple one-pot coprecipitation of Fe₃O₄ NPs on porous halloysite nanotubes/C (HNTs/C) preformed using abandoned polyurethane foam as a template. HNTs were inserted into the pore of polyurethane foam and formed the skeleton of the nanocomposites after sticking by the carbonized phenolic resin. Fe₃O₄ NPs were well dispersed on the skeleton and finally formed the porous stable HNTs/C/Fe₃O₄ nanocomposites. The optimized HNTs/C/Fe₃O₄ showed ultrafast removal rate (>98% arsenic was removed within 10 min), high removal efficiency and good regeneration capacity. It is worth noting that the adsorption efficiency of As (V) by HNTs/C/Fe₃O₄ was still above 99% after 5 times reuse, indicating the sustainable application. In addition, the application of HNTs/C/Fe₃O₄ for arsenic adsorption is almost not limited by pH. The chemical adsorption process was confirmed by adsorption kinetics, XPS and isothermal adsorption. The q_m of As(III) and As(V) is 34.54 mg/g and 1491.72 mg/g, respectively, which is the highest capacity of As (V) known at present. This study demonstrates an ultrafast, high-efficient and sustainable adsorbent for arsenic treatment in contaminated water, which might also give light on other heavy metals remediation.

高效，快速去除率和良好的可重复使用性的吸附剂对于砷的修复非常重要。在此，制备了一种新型的多孔磁性纳米复合材料，用于通过简单的一锅共沉淀Fe ₃ O ₄ NPs（以废弃的聚氨酯泡沫为模板预先制备）在多孔埃洛石纳米管/ C（HNTs / C）上有效去除砷。将HNTs插入聚氨酯泡沫的孔中，并在碳化酚醛树脂粘结后形成纳米复合材料的骨架。Fe ₃ O ₄ NPs很好地分散在骨架上，最终形成了多孔稳定的HNTs / C / Fe ₃ O ₄纳米复合材料。优化的HNT / C / Fe ₃ O ₄表现出超快的去除率（在10分钟内去除了98％的砷），高去除效率和良好的再生能力。值得注意的是，HNTs / C / Fe ₃ O ₄重复使用5次后，对As（V）的吸附效率仍高于99％，表明其可持续应用。另外，HNT / C / Fe ₃ O ₄在砷吸附中的应用几乎不受pH的限制。通过吸附动力学，XPS和等温吸附确定了化学吸附过程。的q_米As（III）和As（V）的含量分别为34.54 mg / g和1491.72 mg / g，这是目前已知的最高As（V）容量。这项研究证明了一种超快速，高效且可持续的吸附剂，可用于污水中的砷处理，这也可能为其他重金属的修复提供参考。