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Adsorption properties of halloysite modified acrylamide/quince seeds-based hydrogel: Experimental and DFT investigation

Abdollahizad, G ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s10924-022-02537-8
  3. Publisher: Springer , 2022
  4. Abstract:
  5. In this work Halloysite nanotubes were used to synthesis a series of modified acrylamide/Quince seeds-based hydrogels (Poly (AAm-co-QS)/Haln). The as-prepared Poly (AAm-co-QS)/Haln hydrogels displayed improved performance as adsorbent in elimination of methylene blue (MB) from aqueous solution. The structures of the prepared Poly (AAm-co-QS)/Haln hydrogels were identified by XRD, FT-IR, FE-SEM, BET, TGA and EDX. Effect of pH value on the swelling behavior and dye adsorption performance of as-prepared hydrogels was explored. The adsorption MB results suggested that the adsorption kinetics fitted the pseudo-second-order model. The adsorption experiments at various pH condition indicated that Poly (AAm-co-QS)/Hal5 hydrogel has 94.3% removal efficiency at pH 7 after 6 h. Based on the Langmuir model, the maximum capacity was calculated to be 70.72 mg g−1. Investigating the temperature effect on MB adsorption suggested spontaneous (ΔG° < 0) and exothermic (ΔH°< 0) adsorption process. The reactivity parameters of the MB molecules were evaluated by chemical potential (μ), chemical hardness (η) and electrophilicity index (ω) using the energies of the HOMO and LUMO by DFT calculations. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Quince seeds mucilage ; Amides ; Aromatic compounds ; Hydrogels ; Kaolinite ; pH effects ; Acrylamides ; Adsorption properties ; Effect of pH ; Halloysite ; Halloysite nanotubes ; Methylene Blue ; Performance ; pH value ; Quince seed mucilage ; XRD ; Adsorption ; Aqueous solution ; Dye ; Experimental study ; Gel ; Mucilage ; Performance assessment ; PH ; Reaction kinetics ; Temperature effect
  8. Source: Journal of Polymers and the Environment ; Volume 30, Issue 11 , 2022 , Pages 4637-4650 ; 15662543 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10924-022-02537-8