Coal ash conversion into effective adsorbents for removal of heavy metals and dyes from wastewater

Wang, SB, Soudi, M, Li, L and Zhu, ZH (2006) Coal ash conversion into effective adsorbents for removal of heavy metals and dyes from wastewater. Journal of Hazardous Materials, 133 1-3: 243-251. doi:10.1016/j.jhazmat.2005.10.034

Author Wang, SB
Soudi, M
Li, L
Zhu, ZH
Title Coal ash conversion into effective adsorbents for removal of heavy metals and dyes from wastewater
Journal name Journal of Hazardous Materials   Check publisher's open access policy
ISSN 0304-3894
Publication date 2006
Sub-type Article (original research)
DOI 10.1016/j.jhazmat.2005.10.034
Volume 133
Issue 1-3
Start page 243
End page 251
Total pages 9
Editor G. Lyberatos
M F Fingas
Place of publication Amsterdam
Publisher Elsevier Science Bv
Collection year 2006
Language eng
Subject C1
290600 Chemical Engineering
670799 Other
Abstract Fly ash was modified by hydrothermal treatment using NaOH solutions under various conditions for zeolite synthesis. The XRD patterns are presented. The results indicated that the samples obtained after treatment are much different. The XRD profiles revealed a number of new reflexes, suggesting a phase transformation probably occurred. Both heat treatment and chemical treatment increased the surface area and pore volume. It was found that zeolite P would be formed at the conditions of higher NaOH concentration and temperature. The treated fly ash was tested for adsorption of heavy metal ions and dyes in aqueous solution. It was shown that fly ash and the modified forms could effectively absorb heavy metals and methylene blue but not effectively adsorb rhodamine B. Modifying fly ash with NaOH solution would significantly enhance the adsorption capacity depending on the treatment temperature, time, and base concentration. The adsorption capacity of methylene blue would increases with pH of the dye solution and the sorption capacity of FA-NaOH could reach 5 x 10(-5) mol/g. The adsorption isotherm could be described by the Langmuir and Freundlich isotherm equations. Removal of copper and nickel ions could also be achieved on those treated fly ash. The removal efficiency for copper and nickel ions could be from 30% to 90% depending on the initial concentrations. The increase in adsorption temperature will enhance the adsorption efficiency for both heavy metals. The pseudo second-order kinetics would be better for fitting the dynamic adsorption of Cu and Ni ions. (c) 2005 Elsevier B.V. All rights reserved.
Keyword Fly Ash
Basic Dyes
Heavy Metals
Adsorption Isotherm
Engineering, Environmental
Engineering, Civil
Environmental Sciences
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 08:31:39 EST