Comparison of alkali modified fly ash and alkali activated fly ash as Zn(II) ions adsorbent from aqueous solution
Fly ash which is solid waste can be used as an adsorbent for wastewater treatment. Alkali modification and alkali activation on fly ash can increase the adsorption capacity of fly ash. In this study, alkali modified fly ash and alkali activated fly ash were used as Zn(II) ions adsorbents. T...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
International Institute for the Science of Sintering, Beograd
2022-01-01
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| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2022/0350-820X2201049P.pdf |
| Summary: | Fly ash which is solid waste can be used as an adsorbent for wastewater
treatment. Alkali modification and alkali activation on fly ash can increase
the adsorption capacity of fly ash. In this study, alkali modified fly ash
and alkali activated fly ash were used as Zn(II) ions adsorbents. The effect
of adsorption time and initial concentration of Zn(II) ions was studied, as
well as the kinetics and isotherm adsorption. The results showed that the
removal efficiency of Zn(II) ions by alkali activated fly ash is higher than
that by alkali modified fly ash. The adsorptions of Zn(II) ions by alkali
modified fly ash and by alkali activated fly ash have reached equilibrium
after two hours. The increase of initial concentration of Zn(II) ions would
decrease the removal efficiency with both alkali modified fly ash and alkali
activated fly ash. Adsorptions of Zn(II) ions by both alkali modified fly
ash and alkali activated fly ash tend to follow pseudo second order kinetics
model and Langmuir isotherm model with maximum adsorption capacity of 62.696
mg/g and 66.667 mg/g, respectively. |
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| ISSN: | 0350-820X 1820-7413 |