Journal
MOLECULES
Volume 26, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/molecules26020338
Keywords
chiral mesoporous silica; adsorption; enantiomeric separation; kinetic
Funding
- ARC Centre of Excellence for Nanoscale and BioPhotonics [CE140100003]
- ARC Future Fellowship (AEGB) [FT150100342]
- Macquarie University Infrastructure grant [MQRIGB 9201501951]
- China Scholarship Council [CSC 201606410063]
- Australian Research Council [FT150100342] Funding Source: Australian Research Council
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Adsorption kinetic studies were conducted using chiral mesoporous materials NGM-1 and NFM-1 for the enantiomeric separation of l- and d-valine, with calcined versions fitting the Langmuir model and exhibiting high sorption capacities. The results and analysis indicate strong adsorbate-adsorbent interaction and the formation of a monolayer of amino acids on the internal mesopore surface for the preferred enantiomers.
Adsorption kinetic studies are conducted to investigate the potential to use chiral mesoporous materials nanoporous guanosine monophosphate material-1 (NGM-1) and nanoporous folic acid material-1 (NFM-1) for the enantiomeric separation of l- and d-valine. A pseudo-second-order (PSO) kinetic model is applied to test the experimental adsorption equilibrium isotherms, according to both the Langmuir and Freundlich models and the characteristic parameters for each model are determined. The calcined versions of both NGM-1 and NFM-1 fit the Langmuir model with maximum sorption capacities of 0.36 and 0.26 g/g for the preferred adsorption enantiomers, d-valine and l-valine, respectively. Experimental results and the analysis of adsorption models suggest a strong adsorbate-adsorbent interaction, and the formation of a monolayer of tightly packed amino acid on the internal mesopore surface for the preferred enantiomers.
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