• 文献标题:   A stable and easily regenerable solid amine adsorbent derived from a polyethylenimine-impregnated dialdehyde-cellulose/graphene-oxide composite
  • 文献类型:   Article
  • 作  者:   QIU XY, WANG XQ, CHEN SX
  • 作者关键词:  
  • 出版物名称:   NEW JOURNAL OF CHEMISTRY
  • ISSN:   1144-0546 EI 1369-9261
  • 通讯作者地址:  
  • 被引频次:   1
  • DOI:   10.1039/d2nj00530a EA MAR 2022
  • 出版年:   2022

▎ 摘  要

Thermal stability and conductivity are important for long-term performance and easy regeneration of CO2 adsorbents. In this paper, a kind of dialdehyde-cellulose/graphene-oxide composite gel (DAC-GO) with a flexible structure was obtained successfully via periodate oxidation and a self-assembly method. Polyethyleneimine (PEI) was impregnated and crosslinked into a DAC-GO gel using ethylene glycol diglycidyl ether (EGDE) to prepare a solid amine adsorbent (DAC-GO-cPEI) for CO2 adsorption. The adsorption amount and regeneration performance of the DAC-GO-cPEI were evaluated in comparison with those of the adsorbents prepared without adding GO (DAC-cPEI) or crosslinking (DAC-GO@PEI). The structure of the composite gels was different from that of the initial DAC gel, accompanied by the trend of an initial increase in the adsorption amount followed by a decrease as the amount of GO increased. Among DAC-GOs, the DAC-0.05GO with a leaf-vein-branched structure exhibited a higher adsorption amount than others after being functionalized with PEI, in which DAC-0.05GO-cPEI was suitable for achieving long-term adsorption performance. Under wet conditions, DAC-0.05GO-cPEI reached a CO2 adsorption amount as high as 4.25 mmol g(-1) at 25 degrees C, and could be regenerated by purging with a flow of N-2 at a low temperature of 70 degrees C. Furthermore, DAC-0.05GO-cPEI maintained a stable adsorption amount of more than 4 mmol g(-1) after 12 adsorption-desorption cycles, demonstrating that DAC-0.05GO-cPEI was an effective CO2 adsorbent with long-term performance.