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Sisal fiber-based solid amine adsorbent and its kinetic adsorption behaviors for CO2

机译：剑麻纤维基固体胺吸附剂及其对CO2的动力学吸附行为

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摘要

A solid amine adsorbent based on sisal fiber was prepared by grafting copolymerization, in which amine was covalently bound onto sisal fiber. In the absence of moisture, the adsorption capacity of the triethylenetetramine-aminated solid amine fiber (SF-AM-TETA) for CO2 could be 0.75 mmol g(-1) through physical adsorption of pores inherited from the bio-texture of sisal fibers. The adsorption capacity of SF-AM-TETA was greatly promoted by the presence of moisture, which could reach 4.20 mmol g(-1) at room temperature. After 7 adsorption-desorption cycles, the regenerated fiber showed a adsorption capacity of 3.92 mmol g(-1), 93% regeneration efficiency, which confirmed that SF-AM-TETA was capable of keeping its stability and CO2 adsorption capacity even after numbers of regeneration cycles. Furthermore, in order to better interpret the adsorption behavior and adsorption kinetics of the solid amine fiber SF-AM-TETA, two models were applied to fit CO2 adsorption experimental data at different temperatures. The results indicated that the solid amine fiber tended to absorb CO2 by a physical process in the absence of moisture while the chemical absorption was the main process occurring in the presence of moisture.
机译：通过接枝共聚反应制备了基于剑麻纤维的固体胺吸附剂，其中胺共价键合在剑麻纤维上。在没有水分的情况下，通过对剑麻纤维生物质构遗传的孔进行物理吸附，三亚乙基四胺胺化胺纤维（SF-AM-TETA）对CO2的吸附能力可以为0.75 mmol g（-1）。水分的存在极大地促进了SF-AM-TETA的吸附能力，在室温下水分可以达到4.20 mmol g（-1）。经过7个吸附-解吸循环后，再生纤维的吸附容量为3.92 mmol g（-1），再生效率为93％，这证实了SF-AM-TETA即使经过数次吸附后仍能保持其稳定性和CO2吸附容量。再生周期。此外，为了更好地解释固体胺纤维SF-AM-TETA的吸附行为和吸附动力学，使用两个模型拟合不同温度下的CO2吸附实验数据。结果表明，固体胺纤维倾向于在不存在水分的情况下通过物理过程吸收CO 2，而化学吸收是在存在水分的情况下发生的主要过程。

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