Adsorption of Azo-Anionic Dyes in a Solution Using Modified Coconut (Cocos nucifera) Mesocarp: Kinetic and Equilibrium Study
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Reagents
2.2. Experiment Design
2.3. Experimental Methodology
2.3.1. Mechanical Treatment of Biomass
2.3.2. Cellulose Extraction
2.3.3. Cellulose Quaternization
2.3.4. Characterization of Bioadsorbents
2.3.5. Adsorption Tests
2.4. Adsorption Isotherms
2.5. Adsorption Kinetics
3. Results and Discussion
3.1. Characterization of Biomaterials
3.1.1. TGA and DSC Analysis
3.1.2. FTIR Spectroscopy Analysis
3.1.3. SEM-EDS Structural Analysis
3.1.4. Zero Load Point pH
3.2. Effect of Adsorbent Dosage and Initial Concentration
3.3. Adsorption Equilibrium
3.4. Adsorption Kinetics
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Model. | Equation | Parameters |
---|---|---|
Langmuir | qmax (mg/g): maximum amount of analyte removed per unit weight of biomass b (L/mg): constant related to the affinity of the binding sites with the contaminant Ce (mg/L): concentration of the remaining contaminant in solution | |
Freundlich | kF (mg/g (L/mg)1/n): adsorption capacity indicator n: indicates the effect of concentration on adsorption capacity and represents the adsorption intensity. | |
Dabunin–Radushkevich | ε2: l Polanyi’s potential which is based on temperature KDR (mol2/kJ2): Dubinin–Radushkevich constant related to adsorption energy E (kJ/mol): average adsorption energy per molecule of adsorbate required to transfer one mole of the ion from the solution to the adsorbent surface |
Model | Equation | Parameters |
---|---|---|
Pseudo-first-order | k1 (min−1): Lagergren’s kinetic constant qe1 (mg/g): adsorption capacity at equilibrium. qt (mg/g): adsorption capacity at time t t (min): time | |
Pseudo-secon -order | (9) | k2 (g/ mg·min): pseudo-second order kinetic constant qe2 (mg/g): adsorption capacity at equilibrium. qt (mg/g): adsorption capacity at time t t (min): time |
Elovich | (10) | qt (mg/g): adsorption capacity at time t α (mg/g.min−1): initial adsorption rate β (g/mg): desorption constant related to the surface area of the biomaterial |
Intraparticle diffusion | qt (mg/g): adsorption capacity at time t t (min): time k3 (mg/g.min1/2): kinetic constant of intra-particle diffusion |
Peak (Wavelength cm−1) | Functional Group | Chemical Component | |
---|---|---|---|
CC | MCC | ||
3450 | 3390 | Stretching -OH | Cellulose |
2937 | 2937 | Stretching -CH | Cellulose |
2275 | 2337 | Stretching -C=O | Cellulose |
1720 | 1691 | Stretching -C=C | Hemicellulose |
1640 | 1640 | Vibration N=N | Lignin |
1455 | 1455 | Bending vibration -OH | Cellulose |
-- | 1472 | Symmetric deformation of C6H6-Cl | CTAC |
1100 | 1100 | Stretching C-O-C | Polysaccharides |
900 | 890 | Vibration -CH | Cellulose |
Model | Parameters | Tartrazine | Congo Red | ||
---|---|---|---|---|---|
CC | MCC | CC | MCC | ||
Langmuir | qmax (mg/g) | 5.222 | 18.412 | 10.890 | 19.372 |
b (L/mg) | 2.0967 × 10−5 | 1.220 × 10−4 | 0.215 | 0.353 | |
R2 | 0.933 | 0.914 | 0.899 | 0.722 | |
SS | 12.120 | 0.022 | 1.219 | 5.632 | |
Freundlich | kF (mg/g (L/mg)1/n) | 0.033 | 0.956 | 3.516 | 5.598 |
n | 0.937 | 0.973 | 3.527 | 2.224 | |
R2 | 0.936 | 0.915 | 0.732 | 0.629 | |
SS | 0.177 | 0.646 | 2.236 | 2.219 | |
Dubinin–Radushkevich | qDR (mg/g) | 5.214 | 16.512 | 8.544 | 15.072 |
KDR (mol2/kJ2) | 2.441 × 10−4 | 5.181 × 10−6 | 7.106 × 10−7 | 4.3683 × 10−7 | |
E (KJ/mol) | 45.229 | 310.65 | 838.83 | 1069.86 | |
R2 | 0.933 | 0.834 | 0.683 | 0.879 | |
SS | 0.464 | 2.129 | 0.914 | 1.506 |
Contaminant | Adsorbent | qmax (mg/g) | Reference |
---|---|---|---|
Tartrazine | Organobentonite | 40.79 | [23] |
Activated carbon from corn cob modified with H2PO4 | 89.75 | [69] | |
Coconut shell | 4.452 | [70] | |
Commercial activated carbon | 24.22 | ||
Chitosan/polyaniline compound | 617.8 | [59] | |
Chitosan | 46.4 | ||
Polyaniline | 434.5 | ||
Sawdust | 7.71 | [71] | |
Chicken feathers | 0.097 | [72] | |
Activated carbon from moringa seeds | 91.27 | [25] | |
Activated carbon from babassu bone | 11.99 | ||
Activated carbon from babassu coconut | 19.20 | ||
Coconut cellulose | 5.222 | Present study | |
CTAC modified coconut mesocarp cellulose | 18.412 | ||
Congo Red | Residual coconut fiber modified with hexane and HCl | 181.82 | [73] |
Mucuna pruriens activated carbon modified with orthophosphoric acid | 55.56 | [21] | |
Activated carbon from Cornulaca modified with NaOH and NaClO | 78.19 | [74] | |
Cornulaca monacantha | 43.42 | ||
Pine bark | 3.92 | [75] | |
Sugar cane bagasse | 4.43 | [76] | |
Banana peel | 1.721 | [61] | |
Activated carbon from pine cones | 434.78 | [60] | |
Activated carbon from bael shell | 65.039 | [77] | |
Zeolitic particles with high silica content functionalized with ZnO | 161.3 | [22] | |
Eggshell membrane chemically modified with HCl | 117.65 | [68] | |
Coconut cellulose | 5.222 | Present study | |
Coconut mesocarp cellulose modified with CTAC | 18.412 |
Kinetic Model | Parameters | Tartrazine | Congo Red | ||
---|---|---|---|---|---|
CC | MCC | CC | MCC | ||
Pseudo-first-order | qe1 | 4.131 | 11.390 | 7.884 | 11.793 |
k1 | 0.014 | 0.419 | 0.393 | 0.904 | |
SS | 0.297 | 0.151 | 5.3278 | 0.005 | |
R2 | 0.454 | 0.640 | 0.995 | 0.999 | |
Pseudo-second-order | k2 | 0.818 | 11.561 | 7.122 | 8.396 |
qe2 | 0.033 | 0.116 | 6.775 | 11.787 | |
SS | 0.227 | 0.088 | 5.971 | 0.005 | |
R2 | 0.533 | 0.999 | 0.997 | 0.999 | |
Elovich | β | 0.131 | 1.860 | 3.497 | 11.743 |
α | 8.560 | 19.642 | 2.626 | 12.828 | |
SS | 0.082 | 0.122 | 0.603 | 0.036 | |
R2 | 0.756 | 0.987 | 0.985 | 0.998 | |
Intraparticle diffusion | k3 | 0.066 | 2.048 | 1.138 | 9.3 |
SS | 0.134 | 0.163 | 27.665 | 0.007 | |
R2 | 0.456 | 0.867 | 0.632 | 0.999 |
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Tejada-Tovar, C.; Villabona-Ortíz, Á.; Gonzalez-Delgado, Á.D. Adsorption of Azo-Anionic Dyes in a Solution Using Modified Coconut (Cocos nucifera) Mesocarp: Kinetic and Equilibrium Study. Water 2021, 13, 1382. https://doi.org/10.3390/w13101382
Tejada-Tovar C, Villabona-Ortíz Á, Gonzalez-Delgado ÁD. Adsorption of Azo-Anionic Dyes in a Solution Using Modified Coconut (Cocos nucifera) Mesocarp: Kinetic and Equilibrium Study. Water. 2021; 13(10):1382. https://doi.org/10.3390/w13101382
Chicago/Turabian StyleTejada-Tovar, Candelaria, Ángel Villabona-Ortíz, and Ángel Darío Gonzalez-Delgado. 2021. "Adsorption of Azo-Anionic Dyes in a Solution Using Modified Coconut (Cocos nucifera) Mesocarp: Kinetic and Equilibrium Study" Water 13, no. 10: 1382. https://doi.org/10.3390/w13101382