Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof
A molecularly-imprinted silica gel (MISG) sorbent for selective removal of 2-hydroxybenzoic acid (2-HA) was prepared by a surface imprinting technique with a sol gel process. The 2-HA-imprinted silica sorbent was evaluated by parameters including influence of pH, static, kinetic adsorption and selec...
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| Format: | Thesis |
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2014
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| Online Access: | http://studentsrepo.um.edu.my/4784/ http://studentsrepo.um.edu.my/4784/1/Thesis_SITI_FARHANA_SGR_100106.pdf |
| _version_ | 1848772720067608576 |
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| author | Siti Farhana, Abdul Raof |
| author_facet | Siti Farhana, Abdul Raof |
| author_sort | Siti Farhana, Abdul Raof |
| building | UM Research Repository |
| collection | Online Access |
| description | A molecularly-imprinted silica gel (MISG) sorbent for selective removal of 2-hydroxybenzoic acid (2-HA) was prepared by a surface imprinting technique with a sol gel process. The 2-HA-imprinted silica sorbent was evaluated by parameters including influence of pH, static, kinetic adsorption and selectivity experiments. The optimum pH for maximum adsorption capacity to the 2-HA appeared around pH 2 by the polymer. Also, the imprinted sorbent has a fast uptake kinetics which is obtained within a short shaking period of 5 min. When the initial concentration of 2-HA solution increases from 20 ppm to 400 ppm, the adsorbed amount of 2-HA increases from 8.57 mg/g to 60.95 mg/g. The polymer displays good selectivity, and exhibit good reusability. Equilibrium isotherms have been measured experimentally for the adsorption of 2-HA towards MISG. Freundlich model is fitted well for the description for 2-HA adsorption towards sorbent. The process was spontaneous in nature. Pseudo second-order model provide the best correlation coefficient for adsorption kinetics 2-HA towards MISG sorbent. The thermodynamics parameters such as ΔG°, ΔH° and ΔS° values indicated that adsorption of 2-HA towards silica gel was feasible, spontaneous and exothermic in the temperature range of 298K to 353K. |
| first_indexed | 2025-11-14T13:30:59Z |
| format | Thesis |
| id | um-4784 |
| institution | University Malaya |
| institution_category | Local University |
| last_indexed | 2025-11-14T13:30:59Z |
| publishDate | 2014 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | um-47842015-03-12T05:28:40Z Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof Siti Farhana, Abdul Raof Q Science (General) A molecularly-imprinted silica gel (MISG) sorbent for selective removal of 2-hydroxybenzoic acid (2-HA) was prepared by a surface imprinting technique with a sol gel process. The 2-HA-imprinted silica sorbent was evaluated by parameters including influence of pH, static, kinetic adsorption and selectivity experiments. The optimum pH for maximum adsorption capacity to the 2-HA appeared around pH 2 by the polymer. Also, the imprinted sorbent has a fast uptake kinetics which is obtained within a short shaking period of 5 min. When the initial concentration of 2-HA solution increases from 20 ppm to 400 ppm, the adsorbed amount of 2-HA increases from 8.57 mg/g to 60.95 mg/g. The polymer displays good selectivity, and exhibit good reusability. Equilibrium isotherms have been measured experimentally for the adsorption of 2-HA towards MISG. Freundlich model is fitted well for the description for 2-HA adsorption towards sorbent. The process was spontaneous in nature. Pseudo second-order model provide the best correlation coefficient for adsorption kinetics 2-HA towards MISG sorbent. The thermodynamics parameters such as ΔG°, ΔH° and ΔS° values indicated that adsorption of 2-HA towards silica gel was feasible, spontaneous and exothermic in the temperature range of 298K to 353K. 2014 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/4784/1/Thesis_SITI_FARHANA_SGR_100106.pdf Siti Farhana, Abdul Raof (2014) Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof. Masters thesis, University of Malaya. http://studentsrepo.um.edu.my/4784/ |
| spellingShingle | Q Science (General) Siti Farhana, Abdul Raof Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof |
| title | Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof |
| title_full | Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof |
| title_fullStr | Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof |
| title_full_unstemmed | Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof |
| title_short | Synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / Siti Farhana Bt Abdul Raof |
| title_sort | synthesis, characterization and adsorption properties of molecularly imprinted silica gel for the removal of 2-hydroxybenzoic acid (2-ha) from aqueous solution / siti farhana bt abdul raof |
| topic | Q Science (General) |
| url | http://studentsrepo.um.edu.my/4784/ http://studentsrepo.um.edu.my/4784/1/Thesis_SITI_FARHANA_SGR_100106.pdf |