Zeolite synthesis from Brazilian coal fly ash for removal of Zn2+ and Cd2+ from water
MetadataShow full item record
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.
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.
Showing items related by title, author, creator and subject.
Synthesis of zeolites X and A from fly ashes for cadmium and zinc removal from aqueous solutions in single and binary ion systemsIzidoro, Juliana; Fungaro, D.; Abbott, Jennifer; Wang, Shaobin (2013)Two different Brazilian fly ashes were used to selectively synthesize pure zeolites X and A by a two-step process. The zeolites were characterized in terms of mineralogical composition (XRD), morphological analysis (SEM), ...
Terdkiatburana, Thanet (2007)Humic substances are macromolecules that naturally occur in all environments in which vegetation matter are present. In general, humic acid is part of humic substances which form the major fraction of the dissolved organic ...
Measurements of helium adsorption on natural clinoptilolite at temperatures from (123.15 to 423.15) K and pressures up to 35 MPaArami-Niya, Arash ; Rufford, T.E.; Dresp, G.; Al Ghafri, S.; Jiao, F.; May, E.F. (2019)Helium (He) is an increasingly valuable gas that is relatively difficult to recover: most of the global helium supply is produced through the application of deep cryogenic separation processes to the overheads from a ...