Biomass-derived heteroatoms-doped hierarchical porous carbon materials are highly regarded as promising CO₂ adsorbents. However, these materials cannot simultaneously exhibit advanced porosity, high yield, and high heteroatom content. Herein, a series of N, S co-doped hierarchical porous carbons with advanced porosity (narrow micropore: 0.37–0.42 cm³/g), high heteroatom content (N content: 8.54 at% and 8.87 wt% and S content: 0.86 at% and 1.73 wt%) and remarkable yield (57.12–69.13 wt%) was produced using lignin as the raw material via a synergistic strategy involving melamine modification and CuCl₂ activation. Notably, melamine modification not only introduced mesopores, but also promoted the effect of CuCl₂ activation to generate additional micropores. Importantly, the advanced porosity required a low dosage of CuCl₂. The optimized adsorbent (NHPC-850) exhibits outstanding CO₂ adsorption capacity (6.87 mmol/g at 273 K and 100 kPa, 3.57 mmol/g at 303 K and 100 kPa), a moderately high heat of adsorption (34.7 kJ/mol), and an extraordinary CO₂/N₂ selectivity (132 at 273 K/81 at 303 K). These excellent properties are attributed to the well-developed micropores and suitable mesopores of carbon materials, as well as rich nitrogen and sulfur functionality in the carbon structure. Collectively, this work offers new insights into a simple and easy-to-scale strategy for the preparation of biomass-derived N, S co-doped hierarchical porous carbon.

生物质衍生的杂原子掺杂分级多孔碳材料被高度认为是有前途的CO ₂ 吸附剂。然而，这些材料不能同时表现出先进的孔隙率、高产率和高杂原子含量。本文中，一系列N、S共掺杂分级多孔碳具有先进的孔隙率（窄微孔：0.37–0.42 cm ³ /g）、高杂原子含量（N含量：8.54 at%和8.87 wt%）以木质素为原料，通过三聚氰胺改性和 CuCl ₂ 活化的协同策略，获得了显着的产量（57.12–69.13 wt%）和 S 含量：0.86 at% 和 1.73 wt%）。值得注意的是，三聚氰胺改性不仅引入了介孔，而且还促进了CuCl ₂ 活化作用，产生额外的微孔。重要的是，先进的孔隙率需要低剂量的 CuCl ₂ 。优化后的吸附剂 (NHPC-850) 表现出出色的 CO ₂ 吸附能力（273 K 和 100 kPa 时为 6.87 mmol/g，303 K 和 100 kPa 时为 3.57 mmol/g），具有中等高的吸附热(34.7 kJ/mol)，以及非凡的 CO ₂ /N ₂ 选择性（273 K 时为 132/303 K 时为 81）。这些优异的性能归功于碳材料发达的微孔和合适的介孔，以及碳结构中丰富的氮和硫官能团。总的来说，这项工作为制备生物质衍生的 N、S 共掺杂分级多孔碳的简单且易于规模化的策略提供了新的见解。