Lignin-impregnated biochar assisted with microwave irradiation for CO2 capture: adsorption performance and mechanism

IF 13.1 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Biochar Pub Date : 2024-03-08 DOI:10.1007/s42773-024-00310-9

Xueyang Zhang, Haoliang Xu, Wei Xiang, Xinxiu You, Huantao Dai, Bin Gao

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Abstract

Bamboo biochar was modified by lignin impregnation and microwave irradiation to enhance its performance for CO₂ capture. The pore structure of lignin-impregnated biochar was significantly affected by the impregnation ratio. The maximum specific surface area of 377.32 m² g⁻¹ and micropore volume of 0.163 cm³ g⁻¹ were observed on the biochar with an impregnation ratio of 1:20 (mass ratio of lignin to biochar). Lignin impregnation increased the CO₂ adsorption capacity of biochar up to 134.46 mg g⁻¹. Correlation analysis confirmed the crucial role of biochar’s pore structure in adsorption. The Avrami model fitted the CO₂ capture curves well. The calculation of adsorption activation energy suggested that the adsorption process was dominated by physical mechanism assisted with partial chemical mechanism. Meanwhile, Langmuir isotherm analysis indicated that lignin impregnation transformed the larger pores of biochar into more uniform micropores, thereby making the adsorption process closer to monolayer adsorption. Both the high reusability (89.79–99.06%) after 10 successive cycles and the excellent CO₂ selectivity in competitive adsorption confirmed that lignin-impregnated biochar is an outstanding adsorbent for CO₂ capture.

Graphical Abstract

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微波辐照辅助木质素浸渍生物炭捕获二氧化碳：吸附性能和机理

通过木质素浸渍和微波辐照对竹生物炭进行改性，以提高其捕集二氧化碳的性能。木质素浸渍生物炭的孔隙结构受浸渍率的显著影响。浸渍比为 1:20（木质素与生物炭的质量比）的生物炭的最大比表面积为 377.32 m2 g-1，微孔体积为 0.163 cm3 g-1。木质素浸渍使生物炭的二氧化碳吸附能力提高到 134.46 mg g-1。相关分析证实了生物炭孔隙结构在吸附过程中的关键作用。Avrami 模型很好地拟合了二氧化碳捕集曲线。吸附活化能的计算表明，吸附过程以物理机制为主，部分化学机制为辅。同时，Langmuir 等温线分析表明，木质素浸渍将生物炭的较大孔隙转化为更均匀的微孔，从而使吸附过程更接近于单层吸附。连续 10 次循环后的高重复利用率（89.79%-99.06%）和竞争吸附中出色的二氧化碳选择性都证实了木质素浸渍生物炭是一种出色的二氧化碳捕集吸附剂。图文摘要

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来源期刊

Biochar Multiple-

CiteScore

18.60

自引率

10.20%

发文量

期刊介绍： Biochar stands as a distinguished academic journal delving into multidisciplinary subjects such as agronomy, environmental science, and materials science. Its pages showcase innovative articles spanning the preparation and processing of biochar, exploring its diverse applications, including but not limited to bioenergy production, biochar-based materials for environmental use, soil enhancement, climate change mitigation, contaminated-environment remediation, water purification, new analytical techniques, life cycle assessment, and crucially, rural and regional development. Biochar publishes various article types, including reviews, original research, rapid reports, commentaries, and perspectives, with the overarching goal of reporting significant research achievements, critical reviews fostering a deeper mechanistic understanding of the science, and facilitating academic exchange to drive scientific and technological development.