Unravelling the mechanism of amitriptyline removal from water by natural montmorillonite through batch adsorption, molecular simulation and adsorbent characterization studies

Chang, P.-H. and Liu, P. and Sarkar, B. and Mukhopadhyay, R. and Yang, Q.-Y. and Tzou, Y.-M. and Zhong, B. and Li, X. and Owens, G. (2021) Unravelling the mechanism of amitriptyline removal from water by natural montmorillonite through batch adsorption, molecular simulation and adsorbent characterization studies. Journal of Colloid and Interface Science, 598. pp. 379-387. ISSN 1095-7103

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Abstract

Amitriptyline (AMI) is one of the most common tricyclic antidepressant personal care medications. Due to its environmental persistence and bioaccumulation, release of AMI into the environment via wastewater streams in elevated levels could lead to significant ecological and human health impacts. In this study, the adsorption of AMI by montmorillonite (SWy-2), a naturally abundant smectite clay with sodium ions as the main interlayer cations, was investigated. Maximum AMI adsorption (276 mg/g) occurred at pH 7–8. After adsorption, examination of the adsorbent's X-ray diffraction pattern indicated that interlayer expansion had occurred, where chemical stoichiometry confirmed cation exchange as the principal adsorption mechanism. AMI adsorption reached equilibrium within 4 h, with kinetic data best fitting the pseudo-second order kinetic model (R2 = 0.98). AMI adsorption was unaffected by solution pH in the range 2–11, where adsorption was endothermic, and molecular simulations substantiated by Fourier transform infrared spectroscopy and thermogravimetric investigations indicated that the orientation of AMI molecules in the interlayer was via an amine group and a benzene ring. Overall this research shows that SWy-2 has significant potential as a low cost, effective, and geologically derived natural material for AMI removal in wastewater systems.

Item Type:

Journal Article

Journal or Publication Title:

Journal of Colloid and Interface Science

Additional Information:

This is the author’s version of a work that was accepted for publication in Journal of Colloid and Interface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Colloid and Interface Science, 598, 2021 DOI: 10.1016/j.jcis.2021.04.033

Uncontrolled Keywords:

/dk/atira/pure/subjectarea/asjc/2300/2304

Subjects:

?? adsorptionamitriptylinecation exchangemolecular simulationmontmorillonitebiochemistryclay mineralsfourier transform infrared spectroscopymetal ionsmolecular orientationmolecular structurepositive ionsthermogravimetric analysisadsorption mechanismcharacter ??

Departments:

Faculty of Science and Technology > Lancaster Environment Centre

ID Code:

155445

Deposited By:

ep_importer_pure

Deposited On:

28 May 2021 08:55

Refereed?:

Yes

Published?:

Published

Last Modified:

13 Nov 2023 00:26

URI:

https://eprints.lancs.ac.uk/id/eprint/155445