Sorption of dissolved mercury (II) species on calcium-montmorillonite

An unusual pH dependence of sorption process

József Kónya, Noémi M. Nagy

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this paper, the special sorption properties of mercury(II) on calcium-montmorillonite is shown. Mercuric hydroxide (Hg(OH)2) produced by the hydrolysis of mercuric ions is fairly soluble, solubility is 3.2 × 10-4 mol/dm3. As a result, indifferently of the usual behavior of other hydroxides, it remains in the aqueous solution. The sorption properties are determined by the fact: there is no precipitation at higher pH values. Montmorillonite contains permanent as well as pH-dependent charges, so the cation exchange on the permanent changes, in the interlayer space of montmorillonite and the sorption of neutral mercuric hydroxide molecules can be studied simultaneously. So, two interfacial processes of the same substance, namely the ion exchange of hexahydrate mercuric(II) ions and the sorption of neutral mercuric hydroxide molecules, can be studied in the same system.

Original languageEnglish
Pages (from-to)447-454
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume288
Issue number2
DOIs
Publication statusPublished - May 2011

Fingerprint

Bentonite
Clay minerals
Mercury
Sorption
Calcium
Hydroxides
Ions
Ion exchange
Ion Exchange
Solubility
Molecules
Cations
Hydrolysis
Positive ions
hydroxide ion

Keywords

  • Adsorption
  • Dissolved mercury hydroxide
  • Hexahydrate mercuric(II) ions
  • Ion exchange
  • Mercury
  • Montmorillonite

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Pollution
  • Health, Toxicology and Mutagenesis
  • Nuclear Energy and Engineering
  • Analytical Chemistry

Cite this

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title = "Sorption of dissolved mercury (II) species on calcium-montmorillonite: An unusual pH dependence of sorption process",
abstract = "In this paper, the special sorption properties of mercury(II) on calcium-montmorillonite is shown. Mercuric hydroxide (Hg(OH)2) produced by the hydrolysis of mercuric ions is fairly soluble, solubility is 3.2 × 10-4 mol/dm3. As a result, indifferently of the usual behavior of other hydroxides, it remains in the aqueous solution. The sorption properties are determined by the fact: there is no precipitation at higher pH values. Montmorillonite contains permanent as well as pH-dependent charges, so the cation exchange on the permanent changes, in the interlayer space of montmorillonite and the sorption of neutral mercuric hydroxide molecules can be studied simultaneously. So, two interfacial processes of the same substance, namely the ion exchange of hexahydrate mercuric(II) ions and the sorption of neutral mercuric hydroxide molecules, can be studied in the same system.",
keywords = "Adsorption, Dissolved mercury hydroxide, Hexahydrate mercuric(II) ions, Ion exchange, Mercury, Montmorillonite",
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AU - Nagy, Noémi M.

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N2 - In this paper, the special sorption properties of mercury(II) on calcium-montmorillonite is shown. Mercuric hydroxide (Hg(OH)2) produced by the hydrolysis of mercuric ions is fairly soluble, solubility is 3.2 × 10-4 mol/dm3. As a result, indifferently of the usual behavior of other hydroxides, it remains in the aqueous solution. The sorption properties are determined by the fact: there is no precipitation at higher pH values. Montmorillonite contains permanent as well as pH-dependent charges, so the cation exchange on the permanent changes, in the interlayer space of montmorillonite and the sorption of neutral mercuric hydroxide molecules can be studied simultaneously. So, two interfacial processes of the same substance, namely the ion exchange of hexahydrate mercuric(II) ions and the sorption of neutral mercuric hydroxide molecules, can be studied in the same system.

AB - In this paper, the special sorption properties of mercury(II) on calcium-montmorillonite is shown. Mercuric hydroxide (Hg(OH)2) produced by the hydrolysis of mercuric ions is fairly soluble, solubility is 3.2 × 10-4 mol/dm3. As a result, indifferently of the usual behavior of other hydroxides, it remains in the aqueous solution. The sorption properties are determined by the fact: there is no precipitation at higher pH values. Montmorillonite contains permanent as well as pH-dependent charges, so the cation exchange on the permanent changes, in the interlayer space of montmorillonite and the sorption of neutral mercuric hydroxide molecules can be studied simultaneously. So, two interfacial processes of the same substance, namely the ion exchange of hexahydrate mercuric(II) ions and the sorption of neutral mercuric hydroxide molecules, can be studied in the same system.

KW - Adsorption

KW - Dissolved mercury hydroxide

KW - Hexahydrate mercuric(II) ions

KW - Ion exchange

KW - Mercury

KW - Montmorillonite

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