期刊
APPLIED GEOCHEMISTRY
卷 17, 期 8, 页码 1159-1164出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0883-2927(02)00057-4
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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(2)O), 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 triethylene 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. (C) 2002 Elsevier Science Ltd. All rights reserved.
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