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Coal ash conversion into effective adsorbents for removal of heavy metals and dyes from wastewater.
J Hazard Mater. 2006 May 20; 133(1-3):243-51.JH

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.

Authors+Show Affiliations

Wang S
Department of Chemical Engineering, Curtin University of Technology, Perth, WA, Australia. wangshao@vesta.curtin.edu.au
Soudi M
No affiliation info available
Li L
No affiliation info available
Zhu ZH
No affiliation info available

MeSH

AdsorptionCarbonCoalCoal AshHydrogen-Ion ConcentrationKineticsMetals, HeavyMethylene BlueMolecular StructureParticulate MatterRhodaminesSodium HydroxideTemperatureTime FactorsWaste Disposal, FluidWater Pollutants, ChemicalX-Ray Diffraction

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16310947

Citation

Wang, Shaobin, et al. "Coal Ash Conversion Into Effective Adsorbents for Removal of Heavy Metals and Dyes From Wastewater." Journal of Hazardous Materials, vol. 133, no. 1-3, 2006, pp. 243-51.
Wang S, Soudi M, Li L, et al. Coal ash conversion into effective adsorbents for removal of heavy metals and dyes from wastewater. J Hazard Mater. 2006;133(1-3):243-51.
Wang, S., Soudi, M., Li, L., & Zhu, Z. H. (2006). Coal ash conversion into effective adsorbents for removal of heavy metals and dyes from wastewater. Journal of Hazardous Materials, 133(1-3), 243-51.
Wang S, et al. Coal Ash Conversion Into Effective Adsorbents for Removal of Heavy Metals and Dyes From Wastewater. J Hazard Mater. 2006 May 20;133(1-3):243-51. PubMed PMID: 16310947.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Coal ash conversion into effective adsorbents for removal of heavy metals and dyes from wastewater. AU - Wang,Shaobin, AU - Soudi,Mehdi, AU - Li,Li, AU - Zhu,Z H, Y1 - 2005/11/28/ PY - 2005/05/19/received PY - 2005/10/10/revised PY - 2005/10/11/accepted PY - 2005/11/29/pubmed PY - 2006/11/3/medline PY - 2005/11/29/entrez SP - 243 EP - 51 JF - Journal of hazardous materials JO - J Hazard Mater VL - 133 IS - 1-3 N2 - 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. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/16310947/Coal_ash_conversion_into_effective_adsorbents_for_removal_of_heavy_metals_and_dyes_from_wastewater_ DB - PRIME DP - Unbound Medicine ER -