Herein, we have produced two series of novel materials including heteroatoms-doped (thiourea-modified) and heteroatoms-deprived microporous carbons using three different potassium salts activators (KOH, K₂CO₃, K₂C₂O₄). The experimental results reveal that thiourea-modified KOH activated sample exhibit excellent textural features (specific surface area∼1795 m²/g, micropore volume∼0.82 cm³/g) but at the expense of a reduced heteroatom content. However, sample prepared with K₂C₂O₄ exhibited a comparable specific surface area (∼1747 m²/g), enough population of narrow micropores (<1.0 nm), the highest micropore volume (0.93 cm³/g) and a high nitrogen (4.6 at. %) and sulfur content (2.3 at. %). Therefore, the optimized sample, STO, exhibits remarkable CO₂ adsorption (269.61 mg/g at 0 °C and 1 bar), excellent IAST CO₂/N₂ selectivity (73), high isosteric heat of adsorption (39.3 kJ/mol) and high cyclic stability, surpassing the CO₂ adsorption/separation performance of most of the biomass-derived carbons. Herein, for the first time, a comprehensive study on potassium salts activation, in comparison with the conventionally practiced KOH activation, is presented. Concluding, the experimental results unveiled K₂C₂O₄ as a more competitive and less corrosive potassium salt activating agent by virtue of its ability to fabricate N, S dual-doped highly porous carbons for efficient CO₂ adsorption and separation.

在此，我们使用三种不同的钾盐活化剂（KOH、K ₂ CO ₃、K ₂ C ₂ O ₄）生产了两个系列的新型材料，包括杂原子掺杂（硫脲改性）和杂原子去除微孔碳。实验结果表明，硫脲改性的 KOH 活化样品表现出优异的结构特征（比表面积~1795 m ² /g，微孔体积~0.82 cm ³ /g），但以降低杂原子含量为代价。然而，用 K ₂ C ₂ O ₄制备的样品表现出相当的比表面积（~1747 m ²/g)、足够多的窄微孔 (<1.0 nm)、最高的微孔体积 (0.93 cm ³ /g) 和高氮 (4.6 at. %) 和硫含量 (2.3 at. %)。因此，优化的样品 STO 表现出显着的 CO ₂吸附（269.61 mg/g 在 0 °C 和 1 bar）、出色的 IAST CO ₂ /N ₂选择性（73）、高等量吸附热（39.3 kJ/mol）和高循环稳定性，超过了大多数生物质衍生碳的 CO ₂吸附/分离性能。在此，首次对钾盐活化与常规实践的 KOH 活化进行了综合研究。最后，实验结果揭示了 K ₂ C₂ O ₄作为一种更具竞争力和腐蚀性较小的钾盐活化剂，因为它能够制造用于高效 CO ₂吸附和分离的N、S 双掺杂高多孔碳。