Rights statement: 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
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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Unravelling the mechanism of amitriptyline removal from water by natural montmorillonite through batch adsorption, molecular simulation and adsorbent characterization studies
AU - Chang, P.-H.
AU - Liu, P.
AU - Sarkar, B.
AU - Mukhopadhyay, R.
AU - Yang, Q.-Y.
AU - Tzou, Y.-M.
AU - Zhong, B.
AU - Li, X.
AU - Owens, G.
N1 - 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
PY - 2021/9/21
Y1 - 2021/9/21
N2 - 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.
AB - 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.
KW - Adsorption
KW - Amitriptyline
KW - Cation exchange
KW - Molecular simulation
KW - Montmorillonite
KW - Biochemistry
KW - Clay minerals
KW - Fourier transform infrared spectroscopy
KW - Metal ions
KW - Molecular orientation
KW - Molecular structure
KW - Positive ions
KW - Thermogravimetric analysis
KW - Adsorption mechanism
KW - Characterization studies
KW - Chemical stoichiometry
KW - Environmental persistences
KW - Molecular simulations
KW - Natural montmorillonite
KW - Pseudo-second-order kinetic models
KW - Tricyclic antidepressants
U2 - 10.1016/j.jcis.2021.04.033
DO - 10.1016/j.jcis.2021.04.033
M3 - Journal article
VL - 598
SP - 379
EP - 387
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 1095-7103
ER -