Molecularly-Imprinted Material for Dibenzothiophene Recognition Prepared by Surface Imprinting Methods
Molecular imprinting has been conducted on the surface of TiO 2 particles to enable the recognition of dibenzothiophene (DBT) molecules. This was achieved via the use of a novel surface molecular-imprinting technique. The adsorption behaviour of the dibenzothiophene-imprinted material (D-MIP/TiO 2 )...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publications
2009-12-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.27.10.975 |
| Summary: | Molecular imprinting has been conducted on the surface of TiO 2 particles to enable the recognition of dibenzothiophene (DBT) molecules. This was achieved via the use of a novel surface molecular-imprinting technique. The adsorption behaviour of the dibenzothiophene-imprinted material (D-MIP/TiO 2 ) was evaluated using batch adsorption experiments to determine the kinetic, isotherm and thermodynamic parameters. The experimental results showed that the adsorption process followed pseudo-second-order kinetics and that the experimental data were well fitted by the Freundlich adsorption equation. This indicated that adsorption involved a multilayer process. Values of the Gibbs' free energy (ΔG 0 ) ranged from −7.11 kJ/mol to −9.36 kJ/mol over the temperature interval 298–318 K, indicating that the adsorption was endothermic in nature. In addition, D-MIP exhibited selective recognition of DBT relative to other similar compounds such as benzothiophene (BT), 4-methyldibenzothiphene (4-MDBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). In the corresponding selectivity test, D-MIP/TiO 2 showed a greater adsorption capacity towards DBT than BT, 4-MDBT and 4,6-DMDBT. The large imprinting factor (ca. 2.5) exhibited by D-MIP/TiO 2 for DBT could be explained in terms of a covalent assembly mechanism. |
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| ISSN: | 0263-6174 2048-4038 |