壳聚糖改性胺浸渍粉煤灰增强CO2吸附性能及机理研究

IF 7.5 1区 工程技术 Q2 ENERGY & FUELS
Fuel Pub Date : 2025-06-14 DOI:10.1016/j.fuel.2025.135884
Jingwen Lu , Sheng Su , Zhiwei Ma , Tao Liu , Kai Xu , Jun Xu , Long Jiang , Yi Wang , Song Hu , Jun Xiang
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引用次数: 0

摘要

粉煤灰(FA)已显示出具有成本效益的CO2捕集潜力,但其实际应用受到孔隙结构不完善和处理复杂的阻碍。壳聚糖(CS)是一种富含胺基的多糖,具有明显的优势,因为它可以直接合成吸附剂,而不需要高温/高压或模板,并且具有规则的孔隙,使其成为修饰FA以增强其孔隙结构和简化制备过程的理想候选者。为此,研究了CS改性聚乙烯亚胺(PEI)浸渍FA吸附剂在不同条件下对CO2的吸附性能。采用XRD、SEM、FT-IR等手段对其性能和机理进行了表征。表征结果表明,CS的引入将FA吸附剂的不规则大孔转变为有序的三维网络,显著改善了孔隙结构和比表面积,同时将CS中的胺基引入吸附剂中。FA/CS1-50PEI在40°C、100 mL/min、15% CO2条件下的最大CO2吸附量为1.96 mmol/g。经过10次吸附-解吸循环(40°C, 200 mL/min, 15% CO2)后,它保持了93%的初始吸附性能,表现出优异的稳定性和CO2吸附效果。DRIFTS分析证实了CS中胺基的成功引入,不同波数下氨基甲酸酯特异峰的出现进一步验证了CS和PEI中胺基参与了吸附过程。吸附动力学分析表明,吸附机理包括物理吸附和化学吸附。这也证实了CS不仅为PEI浸渍提供了规则的孔隙,而且CS中暴露在孔隙表面的胺基与PEI中的胺基参与了吸附反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced CO2 adsorption on amine-impregnated fly ash modified by Chitosan: Performance and mechanistic insights
Fly ash (FA) has demonstrated cost-effective potential for CO2 capture, yet its practical application is hindered by inadequate pore structure and complex processing. Chitosan (CS), a polysaccharide rich in amine groups, offers distinct advantages as it enables straightforward synthesis of adsorbents without requiring high temperature/pressure or templates, and provides regular pores, making it an ideal candidate for modifying FA to enhance its pore structure and streamline the preparation process. Therefore, the adsorbent of polyethyleneimine(PEI)-impregnated FA modified by CS was developed to investigate CO2 adsorption performance at different conditions. The properties and mechanisms were characterized by XRD, SEM, FT-IR etc. Characterization results revealed that the introduction of CS transformed the irregular macropores of FA adsorbents into ordered three-dimensional networks, significantly improving the pore structure and specific surface area, while introducing amine groups from CS into the adsorbents. The FA/CS1-50PEI achieved a maximum CO2 adsorption capacity of 1.96 mmol/g (40 °C, 100 mL/min and 15 % CO2) in experiments. After 10 adsorption–desorption cycles (40 °C, 200 mL/min and 15 % CO2), it retained 93 % of initial adsorption performance, demonstrating exceptional stability and effectioncy for CO2 adsorption. DRIFTS analysis confirmed the successful introduction of amine groups from CS, and the appearance of carbamate’s specific peak at different wavenumbers further validated the involvement of amine groups in CS and PEI in the adsorption process. Additionally, adsorption kinetic analysis revealed the adsorption mechanism involved both physisorption and chemisorption. It also confirmed that CS not only provided regular pores for PEI impregnation, but also the amine groups in CS exposed to the pore surface participate in adsorption reaction with the that in PEI.
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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