Surface chemical characteristics of coal fly ash particles after interaction with seawater under natural deep sea conditions

Yaniv Brami, Barak Herut, Aldo Shemesh, Hagai Cohen

Research output: Contribution to journalArticlepeer-review

Abstract

The surface (0.2-0.5 nm) chemical characteristics of coal fly ash (CFA) before and after interaction with Mediterranean deep seawater was studied by X-ray photoelectron spectroscopy (XPS). Significantly lower values of Si, Ca, and S and higher values of Mg and CI were found in the retrieved CFA as compared to fresh CFA. It is suggested that hydrolysis of the oxide matrixes results in an alkaline environment which rapidly leads to several chemical reactions. The two most important are (a) dissolution of the amorphous silicate and the calcium phases and (b) precipitation of Mg(OH)2-brucite. A depth profile of the retrieved CFA was measured by both line-shape analysis of the XPS spectra and by consecutive cycle of sputtering. The thickness of the brucite layer is estimated to be 1.3 nm.

Original languageEnglish
Pages (from-to)276-281
Number of pages6
JournalEnvironmental Science & Technology
Volume33
Issue number2
DOIs
StatePublished - 15 Jan 1999
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry

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