Rozaini, Hafiz and Saad, Bahruddin and Lim, Jun Wei and Yahaya, Noorfatimah and Ramachandran, Muggundha Raoov and Ridzuan, Nur Diyan Mohd and Kiatkittipong, Worapon and Pasupuleti, Visweswara Rao and Lam, Sze Mun and Sin, Jin Chung (2022) Competitive removal mechanism to simultaneously incarcerate bisphenol A, triclosan and 4-tert-octylphenol within beta-cyclodextrin crosslinked citric acid used for encapsulation in polypropylene membrane protected-micro-solid-phase extraction. Chemosphere, 309 (1). ISSN 0045-6535, DOI https://doi.org/10.1016/j.chemosphere.2022.136626.
Full text not available from this repository.Abstract
Endocrine disrupting compounds (EDCs) are extensively found in the environment and severely impacting human health. In addressing this issue, the beta-cyclodextrin crosslinked citric acid (BCD-CA) had been previously employed in membrane-protected micro-solid phase extraction for sequestering EDCs from water medium; and the findings revealed that BCD-CA possessed a selectivity property. On that account, the potential of BCD-CA towards competitive adsorption of selected EDCs was investigated in terms of adsorption mechanism and selectivity property. Factors that affected the removal efficiencies such as sample pH, sorbent dosage, contact time and initial concentration were evaluated. The characterization results revealed that the carbon percentage of BCD-CA had increased by 2.04%, while the hydrogen percentage had reduced by 1.83%, signifying the successful crosslinking of BCD-CA. Besides, the amount of active BCD was calculated to be 3.2 x 10(-7) mol, while the amount of carboxyl group was 2.48 x 10(-5) mol per 4 mg of BCD-CA. Moreover, BCD-CA was stable in an aqueous medium with the zeta potential obtained at -36.5 mV and had a high-water retention capacity (similar to 150%). The competitive adsorption mechanism by BCD-CA with EDCs followed the pseudo-second-order kinetics and Freundlich isotherm, suggesting that the adsorption process was dominated by chemisorption on the heterogeneous surface of the adsorbent. Thermodynamic results revealed that adsorption of 4-tert-octylphenol had the most negative Delta G value, indicating most favorable to be adsorbed by BCD-CA as opposed to triclosan and bisphenol A, which was coherent with the apparent formation constant results. These unique properties manifested the practicality of BCD-CA as a selective adsorbent to detect and remove EDCs from the water medium.
| Item Type: | Article |
|---|---|
| Funders: | Yayasan Universiti Tekno-logi PETRONAS [YUTP-015LC0-211] |
| Uncontrolled Keywords: | Beta-cyclodextrin; Citric acid; Endocrine disruptor compound; Removal; Adsorption; Selectivity |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences |
| Divisions: | Faculty of Science |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 26 Sep 2023 07:56 |
| Last Modified: | 26 Sep 2023 07:56 |
| URI: | http://eprints.um.edu.my/id/eprint/40829 |
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