Competitive adsorption of Pb2+ and Zn2+ ions from aqueous solutions by modified coal fly ash

Coal fly ash (CFA), which is a solid waste generated in large amounts worldwide, is mainly composed of some oxides having high crystallinity, including quartz (SiO2) and mullite (3Al2O3 2SiO2), and unburned carbon as a mesopore material that enables it to act as a dual site adsorbent. To decrease th...

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Bibliographic Details
Main Authors: Astuti, Widi, Martiani, Wulan, N., Any Ismawati Khair
Format: Conference Proceeding
Language:English
Subjects:
Adsorption
Aluminum
Aqueous solutions
Crystal structure
Crystallinity
Fly ash
Mullite
Silicon dioxide
Sodium hydroxide
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Summary:Coal fly ash (CFA), which is a solid waste generated in large amounts worldwide, is mainly composed of some oxides having high crystallinity, including quartz (SiO2) and mullite (3Al2O3 2SiO2), and unburned carbon as a mesopore material that enables it to act as a dual site adsorbent. To decrease the crystallinity, CFA was modified by sodium hydroxide treatment. The modified fly ash (MFA) contains lower amount of Si and Al and has a higher specific surface area than the untreated fly ash (CFA). The objective of this study is to investigate the competitive adsorption of Pb2+ and Zn2+ from aqueous solutions by CFA and MFA. The effect of pH, contact time and initial concentration was investigated. Effective pH for Pb2+ and Zn2+ removal was 4. A greater percentage of Pb2+ and Zn2+ was removed with a decrease in the initial concentration of Pb2+ and Zn2+. Quasi-equilibrium reached in 240 min.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4976871