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

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

Research output: Contribution to journalArticlepeer-review

61 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 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.

Original languageEnglish
Pages (from-to)9376-9383
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume47
Issue number23
DOIs
Publication statusPublished - 3 Dec 2008
Externally publishedYes

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