Adsorption Isotherms of Caffeine and Theophylline on Metal-Organic Frameworks
The adsorption behaviours of caffeine and theophylline on different metal-organic frameworks were examined by comparing their adsorption isotherms. Among C 18 , UIO-66, UIO-66-NH 2 and MIL-125-NH 2 , UIO-66 showed the highest amount of adsorption of target compounds (i.e. caffeine and theophylline)....
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2014-09-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.32.9.725 |
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| Summary: | The adsorption behaviours of caffeine and theophylline on different metal-organic frameworks were examined by comparing their adsorption isotherms. Among C 18 , UIO-66, UIO-66-NH 2 and MIL-125-NH 2 , UIO-66 showed the highest amount of adsorption of target compounds (i.e. caffeine and theophylline). The maximum adsorbed amounts of caffeine and theophylline on UIO-66 were 0.451 and 0.392 mg, respectively. The experimental parameters in the equilibrium isotherms were estimated by linear and non-linear regression analyses. The adsorption equilibrium data of caffeine and theophylline were investigated using the following four models: linear, Langmuir, Freundlich and Langmuir–Freundlich models. Of these models, the Langmuir–Freundlich model showed the best fit. The regression coefficients (r 2 ) of the Langmuir–Freundlich model for adsorption of caffeine and theophylline on UIO-66 were 0.976 and 0.989, respectively. |
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| ISSN: | 0263-6174 2048-4038 |