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Zeolite synthesis from Brazilian coal fly ash for removal of Zn2+ and Cd2+ from water

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Open access
Authors
Izidoro, J.
Fungaro, D.
Wang, Shaobin
Date
2011
Type
Journal Article

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Izidoro, Juliana de Carvalho and Fungaro, Denise Alves and Wang, Shaobin. 2011. Zeolite synthesis from Brazilian coal fly ash for removal of Zn2+ and Cd2+ from water. Advanced Materials Research. 356-360: pp. 1900-1908.
Source Title
Proceedings from 2011 International Conference on Energy, Environment and Sustainable Development
Source Conference
2011 International Conference on Energy, Environment and Sustainable Development
DOI
School
Department of Chemical Engineering
Remarks

Copyright © 2011 Trans Tech Publications.

This paper was presented at the International Conference on Energy, Environment and Sustainable Development, held in Shanghai, China on Oct 21 2011. Published by Trans Tech Publications.

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Abstract

A Brazilian fly ash sample (CM1) was used to synthesize zeolites by hydrothermal treatment. Products and raw materials were characterized in terms of real density (Helium Pycnometry), specific surface area (BET method), morphological analysis (SEM), chemical composition (XRF) and mineralogical composition (XRD). The zeolites (ZM1) from fly ash were used for metal ion removal from water. Results indicated that hydroxy-sodalite zeolite could be synthesized from fly ash sample. The zeolite presented higher specific surface area and lower SiO2/Al2O3 ratio than the ash precursor. The adsorption showed that cadmium is more preferentially adsorbed on ZM1 than zinc. The adsorption equilibrium time for both Zn2+ and Cd2+ was 20 hours in a batch process. The adsorption isotherms were better fitted by the Langmuir model and the highest percentages of removal using ZM1 were obtained at pH 6 and 5 and doses of 15 and 18 g L-1 for Zn 2+ and Cd2+ , respectively. Thermodynamic studies indicated that adsorption of Zn2+ and Cd2+ by ZM1 was a spontaneous, endothermic process and presented an increase of disorder at the interface solid/solution.