Removal of Nickel Ions from Aqueous Solutions by 2-Hydroxyethyl Acrylate/Itaconic Acid Hydrogels Optimized with Response Surface Methodology
Abstract
:1. Introduction
2. Results and Discussion
2.1. Optimization of Hydrogel Synthesis
2.2. The Influence of pH, Adsorbent Weight and Ionic Strength on Adsorption of Ni2+ Ions
2.3. Characterization of Ni2+ Loaded HEA/10IA Hydrogel
2.4. Adsorption Isotherms
2.5. Adsorption Kinetics and Thermodynamics Studies
2.6. Desorption and Regeneration Studies
3. Conclusions
4. Materials and Methods
4.1. Materials
4.2. Hydrogel Synthesis
4.3. Optimization of Hydrogel Synthesis
4.4. Hydrogels Characterisation
4.5. Adsorption Experiments
4.6. Desorption and Regeneration
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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MODEL | Equation | Parameter | HEA/10IA |
---|---|---|---|
Langmuir | KL (L/g) | 5.45 | |
qm (mg/g) | 269.54 | ||
R2 | 0.9988 | ||
χ2 | 5.0713 | ||
Freundlich | KF (mg g−1 (L mg−1)1/n) | 2.18 | |
N | 1.25 | ||
R2 | 0.9944 | ||
χ2 | 29.5 | ||
Redlich–Peterson | KR (L/g) | 1.69 | |
Β | 0.53 | ||
aR (Lmol) | 0.074 | ||
R2 | 0.9951 | ||
χ2 | 2.2826 | ||
Temkin | KT (L/g) | 0.10 | |
B | 53.92 | ||
b (J/mol) | 45.95 | ||
R2 | 0.8498 | ||
χ2 | 39.3581 | ||
Dubinin–Radushkevich | qm (mg g−1) × 10−6 | 0.49 | |
E (kJ/mol) | 0.64 | ||
β × 106 | 1.23 | ||
R2 | 0.7726 | ||
χ2 | 259.6563 |
C0 (mg/L) | HEA/10IA |
---|---|
10.00 | 0.9483 |
53.13 | 0.7810 |
98.72 | 0.6539 |
202.24 | 0.4832 |
307.53 | 0.3687 |
427.11 | 0.2932 |
518.06 | 0.2578 |
Hydrogel | qm (mg/g) | Reference |
---|---|---|
HEA/MALA | 58.2 | [37] |
Modified silica | 12.4 | [38] |
C-g-AA | 380.1 | [39] |
Chitosan(chitin)/cellulose composite biosorbents | 13.2 | [40] |
Magnetic p(AMPS) hydrogels | 114.9 | [41] |
HEA/10IA | 225.4 | Present study |
qe,exp (mg/g) | Pseudo-First Order Model | Pseudo-Second Order Model | |||||
---|---|---|---|---|---|---|---|
k1 (h−1) | qe,cal (mg/g) | R2 | k2 (g mg−1 h−1) | qe,cal (mg/g) | R2 | ||
HEA/10IA | 7.81 ± 0.24 | 0.123 | 5.663 | 0.9299 | 1.922 | 8.753 | 0.9904 |
Temperature | qe,exp | ∆Go | ∆Ho | ∆So | |
---|---|---|---|---|---|
(°C) | (mg/g) | (kJ/mol) | (kJ/mol) | (J/mol/K) | |
Ni2+ | 10 | 7.96 ± 0.19 | 0.208 | −4.084 | −15.13 |
25 | 7.81 ± 0.24 | 0.449 | |||
50 | 7.44 ± 0.16 | 0.814 |
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Antić, K.; Onjia, A.; Vasiljević-Radović, D.; Veličković, Z.; Tomić, S.L. Removal of Nickel Ions from Aqueous Solutions by 2-Hydroxyethyl Acrylate/Itaconic Acid Hydrogels Optimized with Response Surface Methodology. Gels 2021, 7, 225. https://doi.org/10.3390/gels7040225
Antić K, Onjia A, Vasiljević-Radović D, Veličković Z, Tomić SL. Removal of Nickel Ions from Aqueous Solutions by 2-Hydroxyethyl Acrylate/Itaconic Acid Hydrogels Optimized with Response Surface Methodology. Gels. 2021; 7(4):225. https://doi.org/10.3390/gels7040225
Chicago/Turabian StyleAntić, Katarina, Antonije Onjia, Dana Vasiljević-Radović, Zlate Veličković, and Simonida Lj. Tomić. 2021. "Removal of Nickel Ions from Aqueous Solutions by 2-Hydroxyethyl Acrylate/Itaconic Acid Hydrogels Optimized with Response Surface Methodology" Gels 7, no. 4: 225. https://doi.org/10.3390/gels7040225