Anion Effect on Cu2+ Adsorption on NH2-MCM-41

被引：60

作者：

Lam, Koon Fung ^{[1
]}

Chen, Xinqing ^{[1
]}

McKay, Gordon ^{[1
]}

Yeung, King Lun ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2008年 / 47卷 / 23期

关键词：

D O I：

10.1021/ie701748b

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The anion effect was investigated for the copper adsorption on NH2-MCM-41 from Cu(NO3)(2) and CuSO4 solutions. The copper adsorption was higher and faster in the presence Of SO42- 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 NH2-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 Cu2+ 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.

引用

页码：9376 / 9383

页数：8

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