Removal of Cesium from Radioactive Waste Liquids Using Geomaterials
Abstract
:1. Introduction
2. Materials and Methods
2.1. Synthesis of the Adsorbent
2.2. Characterization of the Adsorbent
2.3. Adsorption Experiments
2.4. Adsorption Isotherm
2.5. Kinetic Studies
3. Results and Discussion
3.1. Adsorption Experiment
3.1.1. Effect of pH on the Adsorption of Cs
3.1.2. Effect of the Adsorbent Dosage on the Adsorption of Cs
3.1.3. Effect of Contact Time on the Adsorption of Cs
3.2. Characterization of Geomaterials
3.3. Adsorption Kinetics Study
3.4. Adsorption Isotherm Study
3.5. Adsorption Mechanism
- (1)
- The adsorption experiment data of Cs on fly ash-based geomaterials and slag-based geomaterials conform to the Langmuir isotherm adsorption equation. The isothermal fitting of the Langmuir model shows that the surface is heterogeneous, which indicates that the adsorption of Cs on the surface of the adsorbent mainly occurred as single-layer adsorption.
- (2)
- The best fit was obtained with the pseudo-second-order kinetic model while investigating the adsorption kinetics of Cs adsorption on the fly ash-based geomaterials, indicating that the adsorption process was mainly chemical adsorption. The R2 was greater than 0.996. On the other hand, Cs adsorption on the slag-based geomaterials was suitably described by the pseudo-first-order model as well as by the pseudo-second-order model (the R2 values were both about 0.999), indicating that physical as well as chemical adsorption were dominant in the adsorption process.
3.6. Comparison with Other Adsorbents
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Weight of Mixture (g) | |||
---|---|---|---|
Chemical Compositions | Portland Cement | Fly Ash | Slag |
CaO | 15.6 | 2.65 | 23.9 |
SiO2 | 5.25 | 25.8 | 16.2 |
Al2O3 | 1.48 | 11.0 | 5.75 |
Fe2O3 | 0.800 | 5.40 | 0.300 |
MgO | 0.700 | 1.00 | 1.50 |
TiO2 | - | 0.800 | 0.250 |
Sample | BET Surface Area [m2·g−1] | Pore Volume [cm3·g−1] | Pore Size [nm] |
---|---|---|---|
Portland Cement | 0.9582 | 0.002652 | 11.07 |
Slag | 1.388 | 0.004432 | 12.77 |
Fly Ash | 1.869 | 0.006359 | 13.61 |
Sample | qexp (mg/g) | Pseudo-First-Order | Pseudo-Second-Order | ||||
---|---|---|---|---|---|---|---|
qe (mg·g−1) | k1 (h−1) | R2 | qe (mg·g−1) | k2 (g·mg−1·h−1) | R2 | ||
Fly ash | 83.68 | 53.20 | 0.03620 | 0.6936 | 85.82 | 12.83 | 0.9955 |
Slag | 60.93 | 60.67 | 0.1812 | 0.9994 | 31.71 | 12.40 | 0.9989 |
Sample | Langmuir Isotherm | Freundlich Isotherm | ||||
---|---|---|---|---|---|---|
qmax (mg·g−1) | KL (L·mg−1) | R2 | KF ((mg·g−1)· (dm−3·mg−1)1/n) | 1/n | R2 | |
Fly ash | 89.32 | 0.1665 | 0.9948 | 10.75 | 0.01620 | 0.1309 |
Slag | 44.52 | 0.02126 | 0.9954 | 20.55 | 0.04660 | 0.3698 |
Adsorbents | Final Concentration (mg·L−1) | Adsorption Capacity (mg·g−1) | Partition Coefficient (mg·g−1·mM−1) | Reference |
---|---|---|---|---|
nFe/Cu–Z | 26.28 | 77.51 | 2.949 | [43] |
Natural clinoptilolite from Serbia | 76.00 | 49.26 | 0.6482 | [44] |
Nanocrystalline mordenite (pulverized) | 4.000 | 37.30 | 9.325 | [45] |
MWCNT reinforced zeolite-A beads | 30.00 | 113.0 | 3.767 | [46] |
Carbon–zeolite | 156.0 | 120.9 | 0.7750 | [47] |
Natural mordenite | 9.574 | 254.8 | 26.61 | [48] |
Synthetic mordenite | 9.508 | 220.4 | 23.18 | [48] |
Phosphoric acid activated montmorillonite | 13.30 | 208 | 15.64 | [49] |
Ethyl-VER | 2.161 | 43.96 | 20.34 | [50] |
Bentonite | 8.700 | 177.4 | 20.39 | [51] |
Clinoptilolite | 12.50 | 12.50 | 1.000 | [52] |
Fly ash-based geomaterials | 2.879 | 89.32 | 31.02 | This study |
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Zhang, H.; Zhu, M.; Du, X.; Feng, S.; Miyamoto, N.; Kano, N. Removal of Cesium from Radioactive Waste Liquids Using Geomaterials. Appl. Sci. 2021, 11, 8407. https://doi.org/10.3390/app11188407
Zhang H, Zhu M, Du X, Feng S, Miyamoto N, Kano N. Removal of Cesium from Radioactive Waste Liquids Using Geomaterials. Applied Sciences. 2021; 11(18):8407. https://doi.org/10.3390/app11188407
Chicago/Turabian StyleZhang, Haixin, Mingze Zhu, Xiaoyu Du, Sihan Feng, Naoto Miyamoto, and Naoki Kano. 2021. "Removal of Cesium from Radioactive Waste Liquids Using Geomaterials" Applied Sciences 11, no. 18: 8407. https://doi.org/10.3390/app11188407