Mechanisms of Cu 2+ , triethylenetetramine (TETA), and Cu-TETA sorption on rectorite and its use for metal removal via metal-TETA complexation

Zhaohui Li, Po Hsiang Chang, Wei-Teh Jiang

Research output: Contribution to journalArticle

Abstract

Uptake of metals, organics, and formation of metal-organic complexes on the surface or in the interlayer of clay minerals had been studied extensively over the last half century. In this study, we investigated the uptake mechanisms of Cu 2+ , triethylenetetramine (TETA), and Cu-TETA on rectorite and its use for metal removal via metal-TETA complexation. The uptake of Cu 2+ , TETA, and Cu-TETA by rectorite occurred on the external as well as in the interlayer space, resulting in a change of d 001 -spacing due to differences in sizes of interlayer cations or complexes. Although the uptake of Cu 2+ and Cu-TETA by rectorite was via a cation exchange process as evidenced by the stoichiometric desorption of dominant interlayer cation Ca 2+ , the uptake of TETA alone on rectorite was via complexation with interlayer cation Ca 2+ . Due to strong affinity of TETA for Cu 2+ , significant amounts of Cu 2+ uptake occurred on TETA-rectorite. Desorption of Ca 2+ from TETA-rectorite confirmed the replacement of interlayer cation Ca 2+ by Cu 2+ . However, the replacement of Ca 2+ by Cu 2+ in TETA-rectorite did not involved in removal of TETA. As such, TETA-modified clay minerals may serve as a type of sorbents for the removal of selected heavy metals via surface or interlayer via complexation.

Original languageEnglish
Pages (from-to)187-196
Number of pages10
JournalJournal of Hazardous Materials
DOIs
Publication statusPublished - 2019 Jul 5

Fingerprint

rectorite
Trientine
Complexation
complexation
Sorption
sorption
Positive ions
Metals
metal
cation
Clay minerals
Desorption
Cations
clay mineral
desorption
replacement
Sorbents
Heavy metals
Ion exchange
removal

All Science Journal Classification (ASJC) codes

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

Cite this

@article{912b91ed43de497496feed97c80b0e16,
title = "Mechanisms of Cu 2+ , triethylenetetramine (TETA), and Cu-TETA sorption on rectorite and its use for metal removal via metal-TETA complexation",
abstract = "Uptake of metals, organics, and formation of metal-organic complexes on the surface or in the interlayer of clay minerals had been studied extensively over the last half century. In this study, we investigated the uptake mechanisms of Cu 2+ , triethylenetetramine (TETA), and Cu-TETA on rectorite and its use for metal removal via metal-TETA complexation. The uptake of Cu 2+ , TETA, and Cu-TETA by rectorite occurred on the external as well as in the interlayer space, resulting in a change of d 001 -spacing due to differences in sizes of interlayer cations or complexes. Although the uptake of Cu 2+ and Cu-TETA by rectorite was via a cation exchange process as evidenced by the stoichiometric desorption of dominant interlayer cation Ca 2+ , the uptake of TETA alone on rectorite was via complexation with interlayer cation Ca 2+ . Due to strong affinity of TETA for Cu 2+ , significant amounts of Cu 2+ uptake occurred on TETA-rectorite. Desorption of Ca 2+ from TETA-rectorite confirmed the replacement of interlayer cation Ca 2+ by Cu 2+ . However, the replacement of Ca 2+ by Cu 2+ in TETA-rectorite did not involved in removal of TETA. As such, TETA-modified clay minerals may serve as a type of sorbents for the removal of selected heavy metals via surface or interlayer via complexation.",
author = "Zhaohui Li and Chang, {Po Hsiang} and Wei-Teh Jiang",
year = "2019",
month = "7",
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language = "English",
pages = "187--196",
journal = "Journal of Hazardous Materials",
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T1 - Mechanisms of Cu 2+ , triethylenetetramine (TETA), and Cu-TETA sorption on rectorite and its use for metal removal via metal-TETA complexation

AU - Li, Zhaohui

AU - Chang, Po Hsiang

AU - Jiang, Wei-Teh

PY - 2019/7/5

Y1 - 2019/7/5

N2 - Uptake of metals, organics, and formation of metal-organic complexes on the surface or in the interlayer of clay minerals had been studied extensively over the last half century. In this study, we investigated the uptake mechanisms of Cu 2+ , triethylenetetramine (TETA), and Cu-TETA on rectorite and its use for metal removal via metal-TETA complexation. The uptake of Cu 2+ , TETA, and Cu-TETA by rectorite occurred on the external as well as in the interlayer space, resulting in a change of d 001 -spacing due to differences in sizes of interlayer cations or complexes. Although the uptake of Cu 2+ and Cu-TETA by rectorite was via a cation exchange process as evidenced by the stoichiometric desorption of dominant interlayer cation Ca 2+ , the uptake of TETA alone on rectorite was via complexation with interlayer cation Ca 2+ . Due to strong affinity of TETA for Cu 2+ , significant amounts of Cu 2+ uptake occurred on TETA-rectorite. Desorption of Ca 2+ from TETA-rectorite confirmed the replacement of interlayer cation Ca 2+ by Cu 2+ . However, the replacement of Ca 2+ by Cu 2+ in TETA-rectorite did not involved in removal of TETA. As such, TETA-modified clay minerals may serve as a type of sorbents for the removal of selected heavy metals via surface or interlayer via complexation.

AB - Uptake of metals, organics, and formation of metal-organic complexes on the surface or in the interlayer of clay minerals had been studied extensively over the last half century. In this study, we investigated the uptake mechanisms of Cu 2+ , triethylenetetramine (TETA), and Cu-TETA on rectorite and its use for metal removal via metal-TETA complexation. The uptake of Cu 2+ , TETA, and Cu-TETA by rectorite occurred on the external as well as in the interlayer space, resulting in a change of d 001 -spacing due to differences in sizes of interlayer cations or complexes. Although the uptake of Cu 2+ and Cu-TETA by rectorite was via a cation exchange process as evidenced by the stoichiometric desorption of dominant interlayer cation Ca 2+ , the uptake of TETA alone on rectorite was via complexation with interlayer cation Ca 2+ . Due to strong affinity of TETA for Cu 2+ , significant amounts of Cu 2+ uptake occurred on TETA-rectorite. Desorption of Ca 2+ from TETA-rectorite confirmed the replacement of interlayer cation Ca 2+ by Cu 2+ . However, the replacement of Ca 2+ by Cu 2+ in TETA-rectorite did not involved in removal of TETA. As such, TETA-modified clay minerals may serve as a type of sorbents for the removal of selected heavy metals via surface or interlayer via complexation.

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