Nuramira Fateha, Sukor and Rohayu, Jusoh (2025) Hybrid activated carbon/ maltodextrin-functionalized fibrous silica for acetaminophen and amoxicillin adsorption: Advanced statistical physics modelling. Environmental Research, 278 (121691). pp. 1-15. ISSN 0013-9351. (Published)
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Abstract
A novel hybrid adsorbent of activated carbon/maltodextrin-functionalized fibrous silica (AC/KCC-1/DEX) was prepared for the efficient removal of Acetaminophen (ACE) and Amoxicillin (AMOX) from water. Comprehensive characterization via FESEM, TEM, BET, XPS, and FTIR confirmed an enhances surface properties and functional corporation from supporting materials and functionalization agent. Particularly, despite significant decrease in surface area upon DEX functionalization, a remarkable enhancement in adsorption removal efficiency was observed, underscoring the pivotal role of surface chemistry over surface area alone. The AC/KCC-1/DEX exhibited 87.64 m2/g and 122.94 m2/g of micropore and mesopores surface area, respectively, along with reactive functional group of DEX such as –OH, which increase surface polarity and enables strong interactions with polar pharmaceuticals. This innovative material evinced high adsorption capacity of 87.97 mg/g and 77.31 mg/g for ACE and AMOX, respectively, achieving percentage removal of 94 % and 81 %, correspondingly. Adsorption kinetics were best described by the Elovich model, suggesting heterogenous surface interactions, while Redlich-Peterson isotherm favoured physisorption. Advanced statistical physics modelling with key steric parameters provided further mechanistic insights at a molecular level, revealing a multilayer physisorption mechanism with additional chemisorption contributions. Thermodynamic analysis supported the spontaneity and exothermic nature of the process, with negative Gibbs free energy (ΔG) and enthalpy (ΔH) values, while a negative entropy change (ΔS), proposed increased order at the solid-liquid interface, indicative of strong adsorbate-adsorbent affinity and potential chemisorption effects. This study not only demonstrates the effectiveness and adsorption behaviour of AC/KCC-1/DEX but also opens new avenues for sustainable water treatment solutions.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Hybrid adsorbent; Multilayer adsorption; Pharmaceutical wastewater; Statistical physics adsorption model; Surface functionalization |
| Subjects: | T Technology > TP Chemical technology |
| Faculty/Division: | Institute of Postgraduate Studies Faculty of Chemical and Process Engineering Technology Centre for Research in Advanced Fluid & Processes (Fluid Centre) |
| Depositing User: | Mrs Norsaini Abdul Samat |
| Date Deposited: | 09 May 2025 07:47 |
| Last Modified: | 09 May 2025 07:47 |
| URI: | http://umpir.ump.edu.my/id/eprint/44536 |
| Download Statistic: | View Download Statistics |
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