Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
School of Energy & Power Engineering, Jiangsu University, Zhenjiang 212013, China.
J Hazard Mater. 2021 Mar 15;406:124581. doi: 10.1016/j.jhazmat.2020.124581. Epub 2020 Nov 20.
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 Pb adsorption capacity as high as 359.83 mg g. 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 Pb 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 Pb from wastewater, but also explored a new method for the resource utilization of Fenton sludge.
为了实现芬顿污泥的妥善处置，开发了一种新的基于一步水热碳化合成由芬顿污泥制备的氨基化水炭（AHFS）的吸附剂制备方法。研究发现，在 340°C 下反应 60 分钟制备的 AHFS 对 Pb 的吸附容量高达 359.83mg/g。吸附动力学和热力学结果表明，化学相互作用、颗粒内扩散和 AHFS 的单层均匀表面在吸附过程中起主要作用。不同机制（阳离子交换占 43.15%、酸性基团络合占 28.17%和氨基络合占 24.06%）对总 Pb 吸附的贡献比例表明，表面官能团的络合在吸附过程中起主要作用。特别是，氨基的添加有利于增加水炭的吸附容量。此外，根据再生试验，磁性 AHFS 表现出令人满意的重现性和可回收性。这些发现表明，氨基磁性水炭的合成不仅为去除废水中的 Pb 提供了一种创新且高效的重金属吸附剂，还探索了一种利用芬顿污泥的新方法。
