Anion effect on Cu2+ adsorption on NH2-MCM-41

Koon Fung Lam; Xinqing Chen; Gordon McKay; King Lun Yeung

doi:10.1021/ie701748b

Anion effect on Cu²⁺ adsorption on NH₂-MCM-41

Koon Fung Lam
, Xinqing Chen
, Gordon McKay
, King Lun Yeung

Hong Kong University of Science and Technology

Research output: Contribution to journal › Article › peer-review

68 Citations (Scopus)

Abstract

The anion effect was investigated for the copper adsorption on NH ₂-MCM-41 from Cu(NO₃)₂ and CuSO₄ solution. The copper adsorption was higher and faster in the presence of SO ₄^2- anion compared to NO₃^-. The MCM-41 possesses well-ordered mesopores that are readily accessible and a uniform surface that is amenable to the attachment of the chemical moieties for creating tailored adsorption sites. The adsorption sites on NH ₂-MCM-41 were created by grafting aminopropyls on MCM-41, and the random deposition resulted in a site distribution best described by the Freundlich equation. The majority of the adsorption sites (i.e. up to 70%) are readily accessible to Ca²⁺ adsorption. The remaining sites were only accessible in the presence of SO₄^2-. Evidence showed that the SO₄^2- anion affects the adsorption by interacting with the dissolved copper to form [CuSO₄]⁰ species, coadsorbing with Cu²⁺ to form stable complexes, and may even indirectly react with the weakly acidic silanol groups to liberate aminopropyls for more Cu²⁺ adsorption.

Original language	English
Pages (from-to)	9376-9383
Number of pages	8
Journal	Industrial and Engineering Chemistry Research
Volume	47
Issue number	23
DOIs	https://doi.org/10.1021/ie701748b
Publication status	Published - 3 Dec 2008
Externally published	Yes

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title = "Anion effect on Cu2+ adsorption on NH2-MCM-41",

abstract = "The anion effect was investigated for the copper adsorption on NH 2-MCM-41 from Cu(NO3)2 and CuSO4 solution. The copper adsorption was higher and faster in the presence of SO 42- anion compared to NO3-. The MCM-41 possesses well-ordered mesopores that are readily accessible and a uniform surface that is amenable to the attachment of the chemical moieties for creating tailored adsorption sites. The adsorption sites on NH 2-MCM-41 were created by grafting aminopropyls on MCM-41, and the random deposition resulted in a site distribution best described by the Freundlich equation. The majority of the adsorption sites (i.e. up to 70\%) are readily accessible to Ca2+ adsorption. The remaining sites were only accessible in the presence of SO42-. Evidence showed that the SO42- anion affects the adsorption by interacting with the dissolved copper to form [CuSO4]0 species, coadsorbing with Cu2+ to form stable complexes, and may even indirectly react with the weakly acidic silanol groups to liberate aminopropyls for more Cu2+ adsorption.",

author = "Lam, \{Koon Fung\} and Xinqing Chen and Gordon McKay and Yeung, \{King Lun\}",

year = "2008",

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doi = "10.1021/ie701748b",

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journal = "Industrial and Engineering Chemistry Research",

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}

TY - JOUR

T1 - Anion effect on Cu2+ adsorption on NH2-MCM-41

AU - Lam, Koon Fung

AU - Chen, Xinqing

AU - McKay, Gordon

AU - Yeung, King Lun

PY - 2008/12/3

Y1 - 2008/12/3

N2 - The anion effect was investigated for the copper adsorption on NH 2-MCM-41 from Cu(NO3)2 and CuSO4 solution. The copper adsorption was higher and faster in the presence of SO 42- anion compared to NO3-. The MCM-41 possesses well-ordered mesopores that are readily accessible and a uniform surface that is amenable to the attachment of the chemical moieties for creating tailored adsorption sites. The adsorption sites on NH 2-MCM-41 were created by grafting aminopropyls on MCM-41, and the random deposition resulted in a site distribution best described by the Freundlich equation. The majority of the adsorption sites (i.e. up to 70%) are readily accessible to Ca2+ adsorption. The remaining sites were only accessible in the presence of SO42-. Evidence showed that the SO42- anion affects the adsorption by interacting with the dissolved copper to form [CuSO4]0 species, coadsorbing with Cu2+ to form stable complexes, and may even indirectly react with the weakly acidic silanol groups to liberate aminopropyls for more Cu2+ adsorption.

AB - The anion effect was investigated for the copper adsorption on NH 2-MCM-41 from Cu(NO3)2 and CuSO4 solution. The copper adsorption was higher and faster in the presence of SO 42- anion compared to NO3-. The MCM-41 possesses well-ordered mesopores that are readily accessible and a uniform surface that is amenable to the attachment of the chemical moieties for creating tailored adsorption sites. The adsorption sites on NH 2-MCM-41 were created by grafting aminopropyls on MCM-41, and the random deposition resulted in a site distribution best described by the Freundlich equation. The majority of the adsorption sites (i.e. up to 70%) are readily accessible to Ca2+ adsorption. The remaining sites were only accessible in the presence of SO42-. Evidence showed that the SO42- anion affects the adsorption by interacting with the dissolved copper to form [CuSO4]0 species, coadsorbing with Cu2+ to form stable complexes, and may even indirectly react with the weakly acidic silanol groups to liberate aminopropyls for more Cu2+ adsorption.

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U2 - 10.1021/ie701748b

DO - 10.1021/ie701748b

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VL - 47

SP - 9376

EP - 9383

JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

IS - 23

ER -

Anion effect on Cu²⁺ adsorption on NH₂-MCM-41

Abstract

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