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Potassium Recovery from Potassium Solution and Seawater Using Different Adsorbents
- Source :
- Applied Sciences, Vol 11, Iss 8660, p 8660 (2021), Applied Sciences, Volume 11, Issue 18
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- The potassium (K) sorption characteristics with three adsorbents, natural zeolite, ammonium acetate-treated zeolite, and manganese nodule, were studied and compared to see the potential use of manganese nodule as an alternative K adsorbent. In general, the Langmuir isotherm could fit the K sorption in the KCl solutions at different pH conditions better than the Freundlich isotherm. Based on the Langmuir parameters, the maximum K sorption was greater for the zeolite-based adsorbents (i.e., 40–42 mg g−1) than the manganese nodule (i.e., 2.0 mg g−1) at acidic conditions, while the manganese nodule (i.e., 9.7 mg g−1) showed better K sorption at neutral conditions. With the seawater samples, the zeolite-based adsorbents showed higher K recovery (4–14%) than the manganese nodule (0–8.8%). The K sorption on the zeolite-based adsorbents followed the pseudo-second-order kinetics and the K sorption rates were higher for the treated zeolite than the natural zeolite. The repeated sorption tests showed that the natural zeolite could potentially be reused up to three times without any significant loss of K sorption capacity, while the ammonium acetate-treated zeolite lost its K sorption capacity after the single sorption test. Overall, the results show that the manganese nodule may potentially be the alternative to zeolite for K recovery under certain conditions, yet the zeolite-based adsorbents are generally better than the manganese nodule. Thus, more studies to enhance the K recovery using zeolite, including surface modified zeolite, are recommended.
- Subjects :
- Langmuir
Technology
QH301-705.5
Potassium
QC1-999
chemistry.chemical_element
complex mixtures
symbols.namesake
Adsorption
manganese nodule
General Materials Science
Freundlich equation
zeolite
Biology (General)
Zeolite
Instrumentation
QD1-999
seawater
Fluid Flow and Transfer Processes
sorption
Chemistry
Process Chemistry and Technology
potassium
Physics
General Engineering
Langmuir adsorption model
Sorption
Engineering (General). Civil engineering (General)
Computer Science Applications
symbols
Manganese nodule
TA1-2040
Nuclear chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 20763417
- Volume :
- 11
- Issue :
- 8660
- Database :
- OpenAIRE
- Journal :
- Applied Sciences
- Accession number :
- edsair.doi.dedup.....52d29ebc7cdc679d842c852294f113b6