Wenhui Su1, Rui Wang 1, Tiansheng Zhao2


School of Environmental Science and Engineering, Shandong University, Jinan 250199, China
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China


Received: October 6, 2019
Revised: December 17, 2019
Accepted: December 21, 2019
Download Citation: ||https://doi.org/10.4209/aaqr.2019.10.0538 

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Cite this article:

Su, W., Wang, R. and Zhao, T. (2020). CO2-imprinted Sustainable Carbon Derived from Sunflower Heads for Highly Effective Capture of CO2 from Flue Gas. Aerosol Air Qual. Res. 20: 180-192. doi: 10.4209/aaqr.2019.10.0538.


HIGHLIGHTS

  • Sectinesterase was used to prepare biomass-based porous carbon materials.
  • Carbonization coupled with activation leads to ideal porous structure.
  • The biomass-based porous carbon acts as carrier in the stamping process.
  • CO2 imprinted adsorbent was synthesized by surface imprinting technique.
 

ABSTRACT

In this work, novel and cheap CO2 imprinted adsorbents were synthesized on the surface of activated carbon derived from sunflower heads by surface imprinting technique using ethanedioic acid and acrylamide as template molecule and functional monomer, respectively. To obtain CO2 imprinted adsorbents with optimal properties, we studied the effects of ratio of KOH to sunflower-based activated carbon, carbon dosage and adsorption temperature, and found that the optimal conditions were alkali carbon ratio of 0.75:1, carbon dosage of 0.75 g, and adsorption temperature of 20°C. Under these conditions, maximum CO2 adsorption capacity of the adsorbents can attain 1.71 mmol g–1. The selective adsorption performance of the adsorbents for CO2 was studied in the presence of H2O as well as in simulated flue gas. In addition, the adsorbents after adsorption can be effectively regenerated by N2 purge at 120°C. After five adsorption/desorption experiments, the CO2 adsorption capacity only decreased 11%. The results showed that sustainable and cheap CO2 imprinted adsorbents have good adsorption, selectivity and regeneration properties, which are worth being further studied and applied in CO2 capture.


Keywords: CO2; Selectivity; Adsorption; Imprinting technique; Biomass-derived carbon.



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