Mechanism of amitriptyline adsorption on Ca-montmorillonite (SAz-2)

Po Hsiang Chang, Wei-Teh Jiang, Zhaohui Li, Chung Yih Kuo, Jiin-Shuh Jean, Wan-Ru Chen, Guocheng Lv

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The uptake of amitriptyline (AMI) from aqueous environment by Ca-montmorillonite (SAz-2) was studied in a batch system under different physicochemical conditions. The adsorbent was characterized by X-ray diffraction and Fourier transform infrared (FTIR) analyses. The AMI adsorption on SAz-2 obeyed the Langmuir isotherm with a capacity of 330mg/g (1.05mmol/g) at pH 6-7. The adsorption kinetics was fast, almost reaching equilibrium in 2h, and followed a pseudo-second-order kinetic model. Desorption of exchangeable cations correlated with the AMI adsorption well, indicating that cation exchange was the major mechanism. X-ray diffraction patterns showing significant expansions of the d001 spacing and characteristic FTIR band shifts toward higher frequencies after AMI adsorption onto SAz-2 indicated that the adsorbed AMI molecules were intercalated into the interlayers of the mineral. Thermodynamic parameters based on partitioning coefficients suggested that the AMI adsorption was an endothermic physisorption at high adsorption levels. At low and higher AMI adsorption levels, the intercalated AMI molecules take a horizontal monolayer and bilayer conformation, respectively. The higher adsorption capacity suggested that SAz-2 could be a good candidate to remove AMI from wastewater and would be an important environmental sink for the fate and transport of AMI in soils and groundwater.

Original languageEnglish
Pages (from-to)44-52
Number of pages9
JournalJournal of Hazardous Materials
Volume277
DOIs
Publication statusPublished - 2014 Jul 30

Fingerprint

Bentonite
Amitriptyline
Clay minerals
montmorillonite
Adsorption
adsorption
Fourier transform
Fourier Analysis
Fourier transforms
X-Ray Diffraction
Positive ions
X-ray diffraction
Cations
Infrared radiation
X ray diffraction
kinetics
Molecules
Kinetics
Physisorption
Adsorbents

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Chang, Po Hsiang ; Jiang, Wei-Teh ; Li, Zhaohui ; Kuo, Chung Yih ; Jean, Jiin-Shuh ; Chen, Wan-Ru ; Lv, Guocheng. / Mechanism of amitriptyline adsorption on Ca-montmorillonite (SAz-2). In: Journal of Hazardous Materials. 2014 ; Vol. 277. pp. 44-52.
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Mechanism of amitriptyline adsorption on Ca-montmorillonite (SAz-2). / Chang, Po Hsiang; Jiang, Wei-Teh; Li, Zhaohui; Kuo, Chung Yih; Jean, Jiin-Shuh; Chen, Wan-Ru; Lv, Guocheng.

In: Journal of Hazardous Materials, Vol. 277, 30.07.2014, p. 44-52.

Research output: Contribution to journalArticle

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N2 - The uptake of amitriptyline (AMI) from aqueous environment by Ca-montmorillonite (SAz-2) was studied in a batch system under different physicochemical conditions. The adsorbent was characterized by X-ray diffraction and Fourier transform infrared (FTIR) analyses. The AMI adsorption on SAz-2 obeyed the Langmuir isotherm with a capacity of 330mg/g (1.05mmol/g) at pH 6-7. The adsorption kinetics was fast, almost reaching equilibrium in 2h, and followed a pseudo-second-order kinetic model. Desorption of exchangeable cations correlated with the AMI adsorption well, indicating that cation exchange was the major mechanism. X-ray diffraction patterns showing significant expansions of the d001 spacing and characteristic FTIR band shifts toward higher frequencies after AMI adsorption onto SAz-2 indicated that the adsorbed AMI molecules were intercalated into the interlayers of the mineral. Thermodynamic parameters based on partitioning coefficients suggested that the AMI adsorption was an endothermic physisorption at high adsorption levels. At low and higher AMI adsorption levels, the intercalated AMI molecules take a horizontal monolayer and bilayer conformation, respectively. The higher adsorption capacity suggested that SAz-2 could be a good candidate to remove AMI from wastewater and would be an important environmental sink for the fate and transport of AMI in soils and groundwater.

AB - The uptake of amitriptyline (AMI) from aqueous environment by Ca-montmorillonite (SAz-2) was studied in a batch system under different physicochemical conditions. The adsorbent was characterized by X-ray diffraction and Fourier transform infrared (FTIR) analyses. The AMI adsorption on SAz-2 obeyed the Langmuir isotherm with a capacity of 330mg/g (1.05mmol/g) at pH 6-7. The adsorption kinetics was fast, almost reaching equilibrium in 2h, and followed a pseudo-second-order kinetic model. Desorption of exchangeable cations correlated with the AMI adsorption well, indicating that cation exchange was the major mechanism. X-ray diffraction patterns showing significant expansions of the d001 spacing and characteristic FTIR band shifts toward higher frequencies after AMI adsorption onto SAz-2 indicated that the adsorbed AMI molecules were intercalated into the interlayers of the mineral. Thermodynamic parameters based on partitioning coefficients suggested that the AMI adsorption was an endothermic physisorption at high adsorption levels. At low and higher AMI adsorption levels, the intercalated AMI molecules take a horizontal monolayer and bilayer conformation, respectively. The higher adsorption capacity suggested that SAz-2 could be a good candidate to remove AMI from wastewater and would be an important environmental sink for the fate and transport of AMI in soils and groundwater.

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