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- W156558241 abstract "Coal ashes may be converted into zeolitic products by alkaline hydrothermal treatment.In the present study, the capacity of synthesized zeolites from Brazilian coal ashes (6 samples of baghouse filter fly ash and 6 samples of cyclone filter fly ash) for the removal of Zn2+ and Cd2+ from aqueous solutions has been investigated. The equilibrium time achieved by most of zeolites was 24 hours. The equilibrium data obtained fit the Langmuir adsorption isotherm. The maximum cation exchange capacities were between 25.9 and 39.5 mg g-1 for Zn2+ and between 49.5 and 72.3 mg g-1 for Cd2+. The synthetic zeolite (ZM1) presented a surface area of 66.38 m2 g-1, a low Si/Al ratio (1.65) and the formation of sodalite and faujasite zeolites, which contributed to its better performance. Adsoption studies of metal ions by ZM1 indicated the following sequence of selectivity: Pb2+ > Cd2+ > Cu2+ > Zn2+ > Ni2+. For ZM1, the highest removal percentage of Zn2+ and Cd2+ was obtained in pH 5 and recovery of metal was effectively carried out with NaCl 2 mol L-1 solution.The performance of zeolites synthesized from coal ashes with commercial synthetic zeolites was compared, as well as the cost of both. The zeolites synthesized with coal ash had better presented efficiency of retention of zinc and the cadmium than the commercial zeolites.Supervisor:Denise Alves Fungaro" @default.
- W156558241 created "2016-06-24" @default.
- W156558241 creator A5061304925 @default.
- W156558241 date "2008-08-07" @default.
- W156558241 modified "2023-09-27" @default.
- W156558241 title "STUDIES ON REMOVAL OF METAL IONS IN WATER USING ZEOLITES SYNTHESIZED FROM COAL ASHES" @default.
- W156558241 hasPublicationYear "2008" @default.
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