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

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Title Unravelling the mechanism of amitriptyline removal from water by natural montmorillonite through batch adsorption, molecular simulation and adsorbent characterization studies
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Creator Po-Hsiang Chang, Pan Liu, Binoy Sarkar, Raj Mukhopadhyay, Qing-Yuan Yang, Yu-Min Tzou, Bo Zhong, Xuxiang, Gary Owens Li,
 
Subject Adsorption, Amitriptyline, Cation exchange, Molecular simulation, Montmorillonite
 
Description Not Available
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.
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Date 2021-07-23T09:22:31Z
2021-07-23T09:22:31Z
2021-04-01
 
Type Article
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/49542
 
Language English
 
Relation Not Available;
 
Publisher Elsevier