Imine-linked polymer/silica composites for CO2 sequestration

Marimuthu Senthilkumaran, Lakshmanan Eswaran, Chokalingam Saravanan, Pillaiyar Puthiaraj, Perumal Rameshkumar, Paulpandian Muthu Mareeswaran

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11 Scopus citations


The silica supported imine polymers are synthesized using a facile single step Schiff-base condensation. The formation of imine linkage on silica support is confirmed using FT-IR and solid state 13C NMR. The crystallinity and surface morphology of the materials are examined by PXRD and SEM analyses. The thermal stability of the materials is confirmed from TGA analysis. N2 sorption isotherms for Si-TPA-1 and Si-TPA-2 exhibit surface area of 105.8 m2/g and 404.5 m2/g respectively. The adsorption isotherms exhibit meso- and microporous environments of Si-TPAs. The CO2 uptake capacity of Si-TPAs are around 38.86 mg/g - 121. 85 mg/g. The experimental adsorption data is fitted with Langmuir and Freundlich adsorption isotherm models. The thermodynamic parameters emphasis that the adsorption process is spontaneous and exothermic physisorption. Isosteric heats of adsorption for Si-TPAs are around 38.5–32.5 kJ/mol. The high selectivity of CO2 over N2 is obtained for both Si-TPAs at 273 K and also high selectivity of CO2 over CH4 is achieved at 298 K.

Original languageEnglish
Article number121995
JournalMaterials Chemistry and Physics
StatePublished - 1 Jan 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.


  • Adsorption isotherms
  • CO capture
  • Schiff-base
  • Silica particles
  • Thermal stability
  • Thermodynamic parameters


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