Adsorptive Behavior of an Activated Carbon for Bisphenol A Removal in Single and Binary (Bisphenol A—Heavy Metal) Solutions
Abstract
:1. Introduction
2. Materials and Methods
2.1. Adsorbent
2.2. Reagents
2.3. Methodology
3. Results and Discussions
3.1. Influence of pH and Contact Time
3.2. Influence of Adsorbent Dosage
3.3. Influence of the Initial Concentration of BPA
3.4. Kinetic Study
3.5. Equilibrium Study
3.6. Adsorption of BPA-Metals Cations Mixtures
3.7. Cycles of BPA Adsorption/Desorption
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Median particle diameter (MPD) (mm) | 3 |
Density (g/L) | 450 |
Moisture content (%) | 4 |
Specific surface area (m2/g) | 1201 |
Pore volumes (mean widths of micropores 0.71 nm) (cm3/g) | 0.406 |
Pore volumes (diameter between 6.6 and 50 nm) (cm3/g) | 0.046 |
Pore volumes (diameter > 50 nm) (cm3/g) | 0.409 |
Concentration of acidic groups (µeq/g) | 907.7 |
Concentration of basic groups (µeq/g) | 96.0 |
Point of zero charge (pHpzc) | 7.5 |
%C | 68.97 |
%H | 1.03 |
%N | 0.45 |
%S | 1.02 |
%O | 20.23 |
%Ash | 8.30 |
Model | Equation | Parameters |
---|---|---|
Pseudo-first-order | qe adsorption capacity, mg/g k1 kinetic constant of the pseudo-first-order, h−1 | |
Pseudo-second-order | qe adsorption capacity, mg/g k2 kinetic constant of the pseudo-second-order, g/mg·h | |
Elovich | a velocity of initial adsorption, mg/g·h b area of the occupied surface, g/mg | |
Intraparticle | kp the intraparticle diffusion rate constant (mg/(g·min1/2)) C constant of the intraparticle diffusion model (mg/g) |
Model | Parameters | ||
---|---|---|---|
Pseudo-first-order | k1 = 0.164 | qe = 37.17 | r2 = 0.995 |
Pseudo-second-order | k2 = 0.004 | qe = 43.06 | r2 = 1.000 |
Elovich | a = 11.325 | B = 0.099 | r2 = 0.992 |
Intraparticle diffusion | kp = 5.577 | C = 3.082 | r2 = 0.964 |
Model | Equation | Parameters |
---|---|---|
Langmuir | qm maximum adsorption capacity, mg/g b constant related to the affinity of the adsorbent for the adsorbate | |
Freundlich | KF equilibrium constant, (mg/g)·(L/mg)1/n n constant related to the affinity between the adsorbent and the adsorbate | |
Sips | qm maximum adsorption capacity, mg/g b constant related to the affinity of the adsorbent for the adsorbate n parameter characterizing the system’s heterogeneity | |
Temkin | AT constant of union of the equilibrium (L/g), b Temkin constant, B constant related to the heat of adsorption (J/mol), |
Model | Parameters | |||
---|---|---|---|---|
Langmuir | qm = 91.90 | b = 0.64 | r2 = 0.996 | |
Freundlich | KF = 39.49 | n = 5.04 | r2 = 0.941 | |
Sips | qm = 95.06 | b = 0.632 | n = 1.23 | r2 = 1.000 |
Temkin | b = 194.47 | AT = 19.65 | r2 = 0.981 |
Initial Concentration of BPA, mg/L | Partition Coefficients, L/g |
---|---|
1 | 52.00 |
5 | 51.40 |
10 | 49.80 |
20 | 40.75 |
30 | 26.78 |
40 | 20.78 |
80 | 2.60 |
120 | 1.38 |
160 | 0.93 |
Time, min | Cd (II) + BPA | Cu (II) + BPA | Ni (II) + BPA | Pb (II) + BPA |
---|---|---|---|---|
0 | 5 | 5 | 5 | 5 |
30 | 6.9 | 6.3 | 6.2 | 6.4 |
60 | 7.5 | 6.7 | 6.5 | 6.8 |
120 | 7.8 | 6.8 | 6.6 | 7.1 |
240 | 8.1 | 7.2 | 7.0 | 7.2 |
480 | 8.0 | 7.5 | 7.0 | 7.3 |
1440 | 8.0 | 7.4 | 7.3 | 7.3 |
2880 | 7.9 | 7.6 | 7.5 | 7.5 |
Cycle | % Removal | q, mg/g |
---|---|---|
1 | 92.5 | 37.00 |
2 | 91.4 | 36.56 |
3 | 90.2 | 36.08 |
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Martín-Lara, M.A.; Calero, M.; Ronda, A.; Iáñez-Rodríguez, I.; Escudero, C. Adsorptive Behavior of an Activated Carbon for Bisphenol A Removal in Single and Binary (Bisphenol A—Heavy Metal) Solutions. Water 2020, 12, 2150. https://doi.org/10.3390/w12082150
Martín-Lara MA, Calero M, Ronda A, Iáñez-Rodríguez I, Escudero C. Adsorptive Behavior of an Activated Carbon for Bisphenol A Removal in Single and Binary (Bisphenol A—Heavy Metal) Solutions. Water. 2020; 12(8):2150. https://doi.org/10.3390/w12082150
Chicago/Turabian StyleMartín-Lara, M.A., M. Calero, A. Ronda, I. Iáñez-Rodríguez, and C. Escudero. 2020. "Adsorptive Behavior of an Activated Carbon for Bisphenol A Removal in Single and Binary (Bisphenol A—Heavy Metal) Solutions" Water 12, no. 8: 2150. https://doi.org/10.3390/w12082150