Adsorption/Desorption Capability of Potassium-Type Zeolite Prepared from Coal Fly Ash for Removing of Hg2

The feasibility of using potassium-type zeolite (K-type zeolite) prepared from coal fly ash (CFA) for the removal of Hg2+ from aqueous media and the adsorption/desorption capabilities of various potassium-type zeolites were assessed in this study. Potassium-type zeolite samples were synthesized by h...

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Bibliographic Details
Published in:Sustainability 2021-04, Vol.13 (8), p.4269
Main Authors: Kobayashi, Yuhei, Ogata, Fumihiko, Saenjum, Chalermpong, Nakamura, Takehiro, Kawasaki, Naohito
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Caustic soda
Coal-fired power plants
Coexistence
Correlation coefficient
Correlation coefficients
Design of experiments
Desorption
Electricity distribution
Experimental design
Fly ash
Hydrothermal treatment
Interlayers
Membrane filters
Nuclear power plants
Potash
Potassium
Potassium hydroxide
Potassium hydroxides
Sodium hydroxide
Temperature effects
Water conservation
Zeolites
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Summary:The feasibility of using potassium-type zeolite (K-type zeolite) prepared from coal fly ash (CFA) for the removal of Hg2+ from aqueous media and the adsorption/desorption capabilities of various potassium-type zeolites were assessed in this study. Potassium-type zeolite samples were synthesized by hydrothermal treatment of CFA at different intervals (designated CFA, FA1, FA3, FA6, FA12, FA24, and FA48, based on the hours of treatment) using potassium hydroxide solution, and their physicochemical characteristics were evaluated. Additionally, the quantity of Hg2+ adsorbed was in the order CFA, FA1 < FA3 < FA6 < FA12 < FA24 < FA48, in the current experimental design. Therefore, the hydrothermal treatment time is important to enhance the adsorption capability of K-type zeolite. Moreover, the effects of pH, temperature, contact time, and coexistence on the adsorption of Hg2+ were elucidated. In addition, Hg2+ adsorption mechanism using FA48 was demonstrated. Our results indicated that Hg2+ was exchanged with K+ in the interlayer of FA48 (correlation coefficient = 0.946). Finally, adsorbed Hg2+ onto FA48 could be desorbed using a sodium hydroxide solution (desorption percentage was approximately 70%). Our results revealed that FA48 could be a potential adsorbent for the removal of Hg2+ from aqueous media.
ISSN:2071-1050
2071-1050
DOI:10.3390/su13084269