Evaluation of the use of modified coal ash as a potential sorbent for organic waste streams

Woolard C.D., Strong J. and Erasmus C.R. (2002). Evaluation of the use of modified coal ash as a potential sorbent for organic waste streams. In: 5th International Symposium on Environmental Geochemistry, Cape Town South Africa, (1159-1164). Apr 24-29, 2000. doi:10.1016/S0883-2927(02)00057-4


Author Woolard C.D.
Strong J.
Erasmus C.R.
Title of paper Evaluation of the use of modified coal ash as a potential sorbent for organic waste streams
Conference name 5th International Symposium on Environmental Geochemistry
Conference location Cape Town South Africa
Conference dates Apr 24-29, 2000
Journal name Applied Geochemistry   Check publisher's open access policy
Publication Year 2002
Sub-type Fully published paper
DOI 10.1016/S0883-2927(02)00057-4
Open Access Status Not yet assessed
ISSN 0883-2927
Volume 17
Issue 8
Start page 1159
End page 1164
Total pages 6
Language eng
Abstract/Summary Fly ash was modified by hydrothermal treatment with 7 M NaOH. The resultant product displayed an 8-fold increase in surface area. The primary crystalline component of the modified fly ash was identified by X-ray diffraction to be hydroxysodalite (Na6Al6Si6O24·8H 2O). The cation exchange capacity of the modified ash was significantly increased over that of the raw fly ash (188 vs 2 meq g-1). Adsorption experiments showed that the modified fly ash adsorbed a cationic dye (methylene blue) to a much greater extent than an anionic dye (alizarin sulfonate). Saturation adsorption revealed that the capacity of the ash for methylene blue had increased 10-fold during modification when compared to the raw ash. Adsorption is thus ascribed to be a surface effect rather than involving incorporation into the channels of the hydroxysodalite structure.
Subjects 1906 Geochemistry and Petrology
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
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