Hierarchical porous carbons (HPCs) have been successfully prepared by a facile carbonization and subsequent CO₂ activation process using corncob as a natural carbon precursor and Mg(C₂H₃O₂)₂ as a MgO nano-template precursor. The prepared corncob-based hierarchical porous carbons (C-HPCs) with desirable micropores and mesopores feature the excellent absorbency of gas (i.e., CO₂ and CH₄) and solution (i.e., methylene blue (MB)). Increasing the ratio of Mg(C₂H₃O₂)₂/corncob enlarged the specific surface area up to 1004 m²/g, micropore and mesopore volumes, CO₂, CH₄, and MB adsorption capacities (112, 31 and 230 mg/g after 325 min, respectively). The results indicated that the pore structures of C-HPCs can be easily and suitably controlled by the amount of the template precursor and CO₂ activation effecting concurrently, which leads to fascinating adsorption capacity for CO₂, CH₄, and MB.

Graphic abstract

中文翻译：

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玉米芯衍生的分级多孔碳：对气体和废水的吸附机理研究

通过使用玉米芯作为天然碳前驱体和Mg（C ₂ H ₃ O ₂）₂作为MgO纳米模板前驱体，通过容易的碳化和随后的CO ₂活化过程，成功地制备了分级多孔碳（HPC）。所制备的具有所需微孔和中孔的基于玉米芯的分级多孔碳（C-HPC）具有出色的气体（即CO ₂和CH ₄）和溶液（即亚甲基蓝（MB））的吸收能力。增加Mg（C ₂ H ₃ O ₂）₂ /玉米芯的比例可使比表面积增加至1004 m ²/ g，微孔和中孔体积，CO ₂，CH ₄和MB吸附容量（325分钟后分别为112、31和230 mg / g）。结果表明，C-高性能计算机的孔结构可以是由模板前体的量和CO容易且适当地控制₂活化同时实现，其导致令人着迷的吸附容量为CO ₂，CH ₄，和MB。

图形摘要