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

doi:10.1021/es9805573

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 journal › Article › peer-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 language	English
Pages (from-to)	276-281
Number of pages	6
Journal	Environmental Science and Technology
Volume	33
Issue number	2
DOIs	https://doi.org/10.1021/es9805573
State	Published - 15 Jan 1999
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry

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

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.",

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T1 - Surface chemical characteristics of coal fly ash particles after interaction with seawater under natural deep sea conditions

AU - Brami, Yaniv

AU - Herut, Barak

AU - Shemesh, Aldo

AU - Cohen, Hagai

PY - 1999/1/15

Y1 - 1999/1/15

N2 - 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.

AB - 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.

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

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