Abstract Here, a novel adsorbent was prepared from coal-gasification fine slag by acid leaching and amine modification and was used for CO2 capture. The fine slag adsorbent (FSA) material was found to have a specific surface area of 541 m2 g−1 and a pore volume of 0.543 cm3 g−1. To improve the CO2 adsorption capacity of the material, the raw FSA was immobilized with amines through physical impregnation. The FSA-based composites were developed using four types of amines: ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), and tetraethylenepentamine (TEPA). The optimum formula was found to be the FSA loaded with 20 wt% TEPA (FSA-TEPA-20), whose theoretical maximum adsorption capacity for CO2 was 132.5 mg g−1 (273 K). The partition coefficient values obtained at 100% breakthrough for FSA and FSA-TEPA-20 were determined as 1.4 × 10−4 and 3.3 × 10−4 mol kg−1 Pa−1, respectively, which were far superior to those of other mesoporous materials (e.g., SBA-PEI). The FSA-TEPA-20 showed good cycling stability. The reaction mechanism was investigated, and the thermodynamic/kinetic parameters for CO2 adsorption were derived; the adsorption was demonstrated to follow the Avrami model. The strength of the preparation strategy is it enables the development of a high-performance adsorbent from low-cost solid wastes.

中文翻译：

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胺改性制备介孔煤气化细渣吸附剂及其在CO2捕集中的应用

摘要 在此，以煤气化细渣为原料，通过酸浸和胺改性制备了一种新型吸附剂，用于CO2 的捕集。发现细渣吸附剂 (FSA) 材料具有 541 m2 g-1 的比表面积和 0.543 cm3 g-1 的孔体积。为了提高材料的 CO2 吸附能力，原始 FSA 通过物理浸渍用胺固定。基于 FSA 的复合材料是使用四种类型的胺开发的：乙二胺 (EDA)、二亚乙基三胺 (DETA)、三亚乙基四胺 (TETA) 和四亚乙基五胺 (TEPA)。发现最佳配方是负载 20 wt% TEPA (FSA-TEPA-20) 的 FSA，其对 CO2 的理论最大吸附容量为 132.5 mg g-1 (273 K)。FSA 和 FSA-TEPA-20 在 100% 穿透时获得的分配系数值确定为 1。分别为 4 × 10−4 和 3.3 × 10−4 mol kg−1 Pa−1，远优于其他介孔材料（例如 SBA-PEI）。FSA-TEPA-20 表现出良好的循环稳定性。研究了反应机理，推导了CO2吸附的热力学/动力学参数；吸附被证明遵循 Avrami 模型。该制备策略的优势在于它能够从低成本固体废物中开发出高性能吸附剂。