Effects of Silicic Acid on Leaching Behavior of Arsenic from Spent Magnesium-Based Adsorbents Containing Arsenite
Abstract
:1. Introduction
2. Materials and Methods
2.1. Spent Mg-Based Adsorbents
2.1.1. Mg-Based Adsorbents (Unspent)
2.1.2. Synthetic As-Contaminated Water
2.1.3. Preparation of Spent Mg-Based Adsorbents
2.2. Silicic Acid Solution
2.3. Shaking Test with Spent Mg-Based Adsorbents and Silicic Acid Solution
3. Results
3.1. pH of Eluate
3.2. As Concentration in Eluate
3.3. Mg Concentration in Eluate
3.4. Total Si-Normalized Concentration in Eluate
3.5. Reproducibility of Experimental Data
4. Discussion
4.1. Relative Evaluation Using As Leaching Ratio
4.2. Dissolved Forms of Siliacic Acid in Liquid
4.3. Dissolved Forms of Arsenous Acid in Liquid
4.4. Stoichiometric Considerations on Spent Mg-Based Adsorbents
4.4.1. Relationship between Dissolved Components and pH of Eluate
4.4.2. Relationship between Mg Leaching and Silicic Acid Adsorption
4.4.3. Relationship between As Leaching and Silicic Acid Adsorption
4.4.4. Comparison of Spent Mg-Based and Ca-Based Adsorbents
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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No. | Adsorbent | As(Valence) | WAD/V (g/L) | pH0 | CAS0 (mg/L) | CAS (mg/L) | RAS (%) |
---|---|---|---|---|---|---|---|
(1) 1 | MgO | As(III) | 5.004 | 6.99 | 21.792 | 0.149 | 99.3 |
(2) 1 | Mg(OH)2 | As(III) | 5.007 | 7.10 | 21.854 | 1.013 | 95.4 |
(3) 2 | MgO | As(V) | 5.028 | 7.14 | 21.160 | 0.016 | 99.9 |
(4) 2 | Mg(OH)2 | As(V) | 5.012 | 7.11 | 21.065 | 0.024 | 99.9 |
No. | Adsorbent | As(Valence) | αMg (%) | WMg/V (mg/L) | CMg (mg/L) | βMg (%) |
---|---|---|---|---|---|---|
(1) 1 | MgO | As(III) | 59.08 | 2956 | 6.23 | 0.21 |
(2) 1 | Mg(OH)2 | As(III) | 40.55 | 2030 | 7.80 | 0.38 |
(3) 2 | MgO | As(V) | 59.08 | 2971 | 10.37 | 0.35 |
(4) 2 | Mg(OH)2 | As(V) | 40.55 | 2032 | 9.51 | 0.47 |
No. | Adsorbent | As(Valence) | QAS (mg-As/g) |
---|---|---|---|
(1) 1 | MgO | As(III) | 4.32 |
(2) 1 | Mg(OH)2 | As(III) | 4.16 |
(3) 2 | MgO | As(V) | 4.20 |
(4) 2 | Mg(OH)2 | As(V) | 4.20 |
CSi-T0 (mg/L) | 0 | 5 | 25 | 50 | 100 | ||
---|---|---|---|---|---|---|---|
No. | Adsorbent | As(Valence) | pHf | ||||
(1) | MgO | As(III) | 10.66 | 10.75 | 10.74 | 10.72 | 10.32 |
(2) | Mg(OH)2 | As(III) | 10.49 | 10.39 | 10.02 | 9.74 | 9.38 |
(3) 1 | MgO | As(V) | 10.79 | 10.81 | 10.72 | 10.83 | 10.64 |
(4) 1 | Mg(OH)2 | As(V) | 10.38 | 10.26 | 9.95 | 9.66 | 9.47 |
CSi-T0 (mg/L) | 0 | 5 | 25 | 50 | 100 | ||
---|---|---|---|---|---|---|---|
No. | Adsorbent | As(Valence) | CAS (mg/L) | ||||
(1) | MgO | As(III) | 0.108 | 0107 | 0.043 | 0.030 | 0.061 |
(2) | MgOH)2 | As(III) | 0.503 | 0.490 | 0.432 | 0.383 | 0.395 |
(3) 1 | MgO | As(V) | 0.000 | 0.000 | 0.000 | 0.001 | 0.010 |
(4) 1 | Mg(OH)2 | As(V) | 0.012 | 0.028 | 0.265 | 0.677 | 1.89 |
CSi-T0 (mg/L) | 0 | 5 | 25 | 50 | 100 | ||
---|---|---|---|---|---|---|---|
No. | Adsorbent | As(Valence) | CMg (mg/L) | ||||
(1) | MgO | As(III) | 11.9 | 13.7 | 17.2 | 18.9 | 21.3 |
(2) | Mg(OH)2 | As(III) | 9.1 | 9.7 | 11.5 | 13.3 | 14.8 |
(3) 1 | MgO | As(V) | 26.9 | 21.0 | 20.8 | 26.7 | 24.7 |
(4) 1 | Mg(OH)2 | As(V) | 10.7 | 10.7 | 12.9 | 15.1 | 16.7 |
CSi-T0 (mg/L) | 0 | 5 | 25 | 50 | 100 | ||
---|---|---|---|---|---|---|---|
No. | Adsorbent | As(Valence) | CSi-T (mg/L) | ||||
(1) | MgO | As(III) | 0.00 | 0.08 | 0.95 | 3.90 | 18.3 |
(2) | Mg(OH)2 | As(III) | 0.00 | 0.77 | 13.1 | 35.4 | 72.2 |
(3) 1 | MgO | As(V) | 0.00 | 0.15 | 0.15 | 1.41 | 3.24 |
(4) 1 | Mg(OH)2 | As(V) | 0.00 | 2.43 | 17.1 | 40.3 | 70.2 |
CSi-T0 (mg/L) | 0 | 5 | 25 | 50 | 100 | ||
---|---|---|---|---|---|---|---|
No. | Adsorbent | As(Valence) | EAS (%) | ||||
(1) | MgO | As(III) | 1.24 | 1.22 | 0.50 | 0.34 | 0.69 |
(2) | Mg(OH)2 | As(III) | 5.97 | 5.85 | 5.12 | 4.55 | 4.71 |
(3) 1 | MgO | As(V) | >0.01 | >0.01 | >0.01 | >0.01 | 0.12 |
(4) 1 | Mg(OH)2 | As(V) | 0.14 | 0.34 | 3.13 | 7.98 | 22.1 |
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Sugita, H.; Oguma, T.; Hara, J.; Zhang, M.; Kawabe, Y. Effects of Silicic Acid on Leaching Behavior of Arsenic from Spent Magnesium-Based Adsorbents Containing Arsenite. Sustainability 2022, 14, 4236. https://doi.org/10.3390/su14074236
Sugita H, Oguma T, Hara J, Zhang M, Kawabe Y. Effects of Silicic Acid on Leaching Behavior of Arsenic from Spent Magnesium-Based Adsorbents Containing Arsenite. Sustainability. 2022; 14(7):4236. https://doi.org/10.3390/su14074236
Chicago/Turabian StyleSugita, Hajime, Terumi Oguma, Junko Hara, Ming Zhang, and Yoshishige Kawabe. 2022. "Effects of Silicic Acid on Leaching Behavior of Arsenic from Spent Magnesium-Based Adsorbents Containing Arsenite" Sustainability 14, no. 7: 4236. https://doi.org/10.3390/su14074236