棉秆纤维素/Mg-MOF-74复合凝胶的制备及对CO₂的吸附性能研究

Preparation of Cotton Straw Cellulose/Mg-MOF-74 Composite Gel and Adsorption Properties of CO₂

摘要

“双碳”背景下，碳捕集与封存技术（CCUS）已成为研究热点。金属有机骨架（MOFs）作为一种新型的固体吸附剂，具有高空隙率和比表面积、可调节的孔径以及可变的功能基团等特点，在CO₂捕获领域具有很大的应用潜能。本研究通过棉秆提取纤维素（BC），并采用溶剂热合-交联复法成功制备了一种新型MOFs复合凝胶材料（BC/Mg-MOF-74）。BC/Mg-MOF-74随着复合比例的增大，其CO₂容量呈现出先增加再降低的趋势。当吸附温度为35℃，复合比例为30%时达到峰值，常压下CO₂最大吸附量可达548.45 mg/g。

Abstract

Under the background of “two-carbon”, carbon capture and storage technology (CCUS) has become a research hotspot. As a new type of solid adsorbent, metal organic skeleton (MOFs) have high void rate and specific surface area, characteristics, adjustable pore size and variable functional groups, which have great potential in the field of CO₂ capture. In this study, a new MOFs composite gel material of cellulose (BC) (BC/Mg-MOF-74) was successfully prepared by cotton stalk extraction and solvent heat-crosslinking method. With the increase of BC/Mg-MOF-74, its CO₂ capacity showed a trend of increasing first and then decreasing. When the adsorption temperature is 35℃ and the composite ratio is 30%, the maximum adsorption amount of CO₂ under atmospheric pressure can reach 548.45mg/g.

关键词

棉秆纤维素 / Mg-MOF-74 / 复合凝胶 / CO₂ / 吸附性能

Key words

cotton straw cellulose / Mg-MOF-74 / composite gel / CO₂ / adsorption properties

参考文献

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基金资助

省级大学生创新创业项目(S202211535041)