数字农科院2.0

Straw-derived porous biochars by ball milling for CO2 capture: Adsorption performance and enhanced mechanisms

文献类型： 外文期刊

作者： Peizhen Zhang;Juan Luo;Lili Huo;Lixin Zhao;Zonglu Yao

作者机构：

关键词： Adsorption mechanism;Ball milling;Biochar;CO2;Porous structure;Straw

期刊名称： Industrial Crops and Products

ISSN： 0926-6690

年卷期： 2025 年 229 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： In order to break the limitation of straw biochar adsorption capacity, this study evaluates the feasibility of enhancing CO2 adsorption capacity in straw-derived biochars via ball milling (BM) and explores the underlying mechanisms. Biochars were prepared from corn straw, banana stalk, and cotton stalk employing a two-step process comprising pyrolysis followed by the BM process. The ball-milled biochars demonstrated CO2 adsorption capacities of 45.38, 49.88, and 42.60 mg·g−1 at 30 °C, corresponding to increases of 23.52 %, 9.50 %, and 8.93 % in comparison to untreated biochars. The adsorption process was found to be highly exothermic, with CO2 adsorption capacity decreasing by 49.69–65.87 % as the temperature was raised from 0 to 70 °C. Kinetic studies and adsorption isotherms demonstrated that the BM process primarily enhanced physisorption in corn straw biochar and chemisorption in banana stalk and cotton stalk biochars. Correlation analysis indicated that CO2 adsorption was influenced by pore volume, total basicity, and ash composition. The biochars' high adsorption capacity was attributed to pore filling, van der Waals forces, H bonding, and acid-base interactions. Furthermore, after 10 adsorption-desorption cycles, the biochars retained 92.16–98.01 % of their initial CO2 adsorption capacity, demonstrating high stability and reusability. Overall, the findings highlight the potential of the BM process as an effective method for enhancing the CO2 adsorption performance of straw-derived biochar.

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