Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis
Abstract
:1. Introduction
2. Materials and Methods
2.1. Chemical Reagents and Analysis
2.2. Magnetic Nanosorbent Preparation
2.3. Characterization
2.4. Kinetic Measurements
2.5. Sorption Experimentation
3. Results and Discussion
3.1. Characterization
3.2. Adsorptive Measurements
3.2.1. Effect of pH
3.2.2. Kinetics and Isotherms Models
3.2.3. Reusability Assays
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Isotherm | Linearized Equation | Plot |
---|---|---|
Langmuir | Ce/qe = 1/b0qm + Ce/qm | Ce/qe vs. Ce |
Freundlich | lnqe = lnKf + (lnCe)/n | lnqe vs. lnCe |
Temkin | qe = (RT/bT)lnKT + (RT/bT)lnCe | qt vs. lnCe |
Langmuir | Freundlich | Temkin | ||||||
Constant | MNP | APTES | Constant | MNP | APTES | Constant | MNP | APTES |
b0 (L/mg) | 0.19 | 0.08 | Kf (mg/g)/(L/g)1/n | 6.32 | 6.55 | bt (J/mol) | 1259.37 | 440.05 |
qm (mg/g) | 15.00 | 35.00 | 1/n | 0.19 | 0.35 | kt (L/g) | 17.38 | 1.90 |
R2 | 0.98 | 0.97 | R2 | 0.88 | 0.84 | R2 | 0.85 | 0.93 |
Pseudo-First Order | Pseudo-Second Order | Elovich | ||||||
Constant | MNP | APTES | Constant | MNP | APTES | Constant | MNP | APTES |
qe (mg/g) | 9.9 | 20.8 | qe (mg/g) | 10.5 | 21.7 | β (mg/g) | 0.98 | 0.58 |
k1 | 0.27 | 0.35 | k2 | 0.04 | 0.03 | α (mg/g.min) | 325 | 6445 |
R2 | 0.96 | 0.95 | R2 | 0.98 | 0.98 | R2 | 0.89 | 0.88 |
Adsorbent | Surface Charge | pH (-) | qm (mg/g) | Reference |
---|---|---|---|---|
TEOS@MNP | Slightly positive | 2.5 | 0 | This work |
Fe3O4@n–SiO2 NPs | Slightly positive | 2 | 3.8 | [33] |
Fe3O4 (PAA-coated and amino-functionalized) | Negative | 3 | 11.2 | [36] |
Diatomite-supported magnetite NPs | Positive | 2 | 11.4 | [34] |
Iron oxide magnetic nanoparticles (MNPs) | Positive | 2.5 | 15 | This work |
Maghemite nanoparticles | Positive | 2.5 | 17 | [37] |
APTES@TEOS@MNP | Positive | 2.5 | 35 | This work |
(3-MPA)-functionalized iron oxide NPs | Positive | 1 | 45 | [38] |
Chitosan-coated Fe3O4 nanocomposites | Positive | 2 | 81.5 | [32] |
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Gallo-Cordova, A.; Morales, M.d.P.; Mazarío, E. Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis. Water 2019, 11, 2372. https://doi.org/10.3390/w11112372
Gallo-Cordova A, Morales MdP, Mazarío E. Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis. Water. 2019; 11(11):2372. https://doi.org/10.3390/w11112372
Chicago/Turabian StyleGallo-Cordova, Alvaro, María del Puerto Morales, and Eva Mazarío. 2019. "Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis" Water 11, no. 11: 2372. https://doi.org/10.3390/w11112372