CO2-Responsive Graft Modified Chitosan for Heavy Metal (Nickel) Recovery
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Instrumentation
2.3. Synthesis of Chitosan–g–glycidyl Methacrylate (CTS–g–GMA)
2.4. Synthesis of Poly(diethylamino)ethyl Methacrylate (PDEAEMA) via Nitroxide Mediated Polymerization (NMP)
2.5. Synthesis of CTS-g-GMA-PDEAEMA
2.6. Ni(II) Adsorption Equilibrium Studies
2.7. CO2 Regeneration Studies
3. Results & Discussion
3.1. Characterization of CTS–g–GMA
3.2. Characterization of PDEAEMA
3.3. Characterization of CTS–g–GMA–PDEAEMA
3.4. CO2 Regeneration Study
3.5. Ni(II) Adsorption Equilibrium Studies
3.6. Ni(II) Adsorption Modelling
4. Conclusions
Author Contributions
Conflicts of Interest
References
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Adsorbent | pH | Langmuir Isotherm | Freundlich Isotherm | ||
---|---|---|---|---|---|
Theoretical (mg/g) | (L/g) | (L/g) | |||
CTS | 5.80–5.87 | 66.2 | 1.91 × 10−2 | 5.55 | 0.744 |
CTS-g-GMA-PDEAEMA | 5.80–5.87 | 51.3 | 7.57 × 10−3 | 1.29 | 0.112 |
CTS-g-GMA-PDEAEMA with initial CO2 sparging alone | 4.56–4.83 | 59.9 | 1.52 × 10−2 | 5.45 | 0.736 |
Regenerated CTS-g-GMA-PDEAEMA | 5.80–5.87 | 149.3 | 3.25 × 10−3 | 1.92 | 0.283 |
Adsorbent | Equilibrium Adsorption Capacity (qe, mg/g) | pH |
---|---|---|
CTS [34] | 2.4 | 5.0 |
CTS coated PVC beads [27] | 120.5 | 5.0 |
CTS coated perlite [35] | 114.9 | 5.0 |
CTS–g–EDTA [36] | 123.3 | 2.0 |
CTS–g–Acetate crown ether [37] | 0.7 | 5.6 |
CTS–g–Diacetate crown ether [37] | 4.1 | 5.6 |
Epichlorohydrine cross-linked CTS [37] | 6.4 | 5.6 |
Epichlorohydrine cross-linked CTS–g–Histidine [38] | 140.8 | 5.0 |
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Madill, E.A.W.; Garcia-Valdez, O.; Champagne, P.; Cunningham, M.F. CO2-Responsive Graft Modified Chitosan for Heavy Metal (Nickel) Recovery. Polymers 2017, 9, 394. https://doi.org/10.3390/polym9090394
Madill EAW, Garcia-Valdez O, Champagne P, Cunningham MF. CO2-Responsive Graft Modified Chitosan for Heavy Metal (Nickel) Recovery. Polymers. 2017; 9(9):394. https://doi.org/10.3390/polym9090394
Chicago/Turabian StyleMadill, Evan A. W., Omar Garcia-Valdez, Pascale Champagne, and Michael F. Cunningham. 2017. "CO2-Responsive Graft Modified Chitosan for Heavy Metal (Nickel) Recovery" Polymers 9, no. 9: 394. https://doi.org/10.3390/polym9090394