In order to achieve proper disposal of Fenton sludge, a new recycle method for preparing adsorbents based on one-step hydrothermal carbonization synthesis of aminated hydrochar from Fenton sludge (AHFS) was developed. It was found that AHFS prepared at 340 °C for 60 min showed Pb²⁺ adsorption capacity as high as 359.83 mg g⁻¹. Adsorption kinetics and thermodynamics results indicated that chemical interaction, intra-particle diffusion and monolayer homogeneous surface of AHFS dominated in adsorption process. The contribution proportion of different mechanisms, including cation-exchange (43.15%), acidic groups complexation (28.17%) and amino groups complexation (24.06%) to overall Pb²⁺ adsorption, demonstrated that complexation of surface functional groups played the dominated role in the adsorption process. Especially, the addition of amino was conducive to the increased adsorption capacity of hydrochar. In addition, according to the regeneration test, the magnetic AHFS exhibited a satisfactory reproducibility and recyclability. These findings illustrated that the synthesis of aminated magnetic hydrochar not only provided an innovative and efficient heavy metal adsorbent to remove Pb²⁺ from wastewater, but also explored a new method for the resource utilization of Fenton sludge.

为了实现芬顿污泥的合理处理，基于芬顿污泥（AHFS）一步一步水热碳化合成胺化炭的方法，开发了一种新的吸附剂回收方法。发现在340℃下制备60分钟的AHFS显示出高达359.83mg g ^-1的Pb ²⁺吸附容量。吸附动力学和热力学结果表明，AHFS的化学相互作用，颗粒内扩散和单层均匀表面在吸附过程中占主导地位。阳离子交换（43.15％），酸性基团络合（28.17％）和氨基基团络合（24.06％）等不同机制对总Pb ²⁺的贡献比例吸附表明表面官能团的络合在吸附过程中起主要作用。特别地，氨基的加入有利于增加水炭的吸附能力。另外，根据再生测试，磁性AHFS表现出令人满意的可再现性和可回收性。这些发现说明胺化磁性碳氢化合物的合成不仅提供了一种新颖有效的重金属吸附剂，可以去除废水中的Pb ²⁺，还探索了芬顿污泥资源化的新方法。