Kinetics and Thermodynamics Studies for Cadmium (II) Adsorption onto Functionalized Chitosan with Hexa-Decyl-Trimethyl-Ammonium Chloride
Abstract
:1. Introduction
2. Experimental Part
2.1. Obtaining the Biopolymer by Functionalization. Effect of Extractant Dosage
2.2. Characterization of the Functionalized Biopolymer
2.2.1. Batch Studies
- qe—the maximum absorption capacity (mg·g−1).
- C0—initial concentration of cadmium (II) in solution (mg·L−1).
- Ce—the equilibrium concentration of cadmium (II) in solution (mg·L−1).
- V—volume of the aqueous solution with cadmium (II) (L).
- m—mass of the adsorbent (g).
2.2.2. Sorption/Desorption Tests
3. Results and Discussion
3.1. Characterization of the Functionalized Bio Sorbent
3.1.1. X-ray Energy Dispersive Spectroscopy Analysis
3.1.2. Scanning Electron Microscopic Studies
3.1.3. Fourier Transform Infrared Spectroscopy Analysis
3.2. Sorption Studies
3.2.1. Effect of pH over Cd Adsorption on Functionalized Chitosan
3.2.2. Effect of Bio Adsorbent Dosage
3.2.3. Effect of Contact Time, Temperature and Initial Cadmium Concentration
3.2.4. Adsorptions Kinetics
- qe—the adsorption capacity at equilibrium (mg/g),
- qt—is the adsorption capacity at time t,
- t—the contact time (min) and k1 is the adsorption rate constant (1/min).
- qe—the adsorption capacity at equilibrium (mg/g),
- qt—the adsorption capacity at time t,
- t—the contact time (min) and k2 the adsorption rate constant (g/mg∙min).
3.2.5. Adsorption Isotherm Modelling
- qe—the maximum adsorption capacity (mg·g−1),
- Ce—the equilibrium concentration of cadmium (II) in solution (mg·L−1),
- qL—Langmuir maximum adsorption capacity (mg·g−1),
- KL—Langmuir constant.
- qe—the equilibrium adsorption capacity (mg·g−1),
- Ce—the equilibrium concentration of adsorbent in the solution (mg·L−1),
- KF and nF—specific constants that are connected to the relative adsorption capacity of the adsorbent material and the intensity of adsorption.
- qS—the maximum adsorption capacity (mg·g−1),
- KS—constant related to the adsorption capacity of the adsorbent,
- nS—the heterogeneity factor.
3.2.6. Thermodynamic Analysis
- ΔG°—Gibbs free energy standard variation (kJ·mol−1),
- ΔH°—enthalpy variation (kJ·mol−1),
- ΔS°—entropy variation (J·mol−1∙K−1),
- T—absolute temperature (K).
- Kd—equilibrium constant,
- ΔH°—enthalpy variation (kJ·mol−1),
- ΔS°—entropy variation (J·mol−1∙K−1),
- T—absolute temperature (K),
- R—ideal gas constant (8.314 J·mol−1∙K−1).
3.2.7. Sorption/Desorption Studies
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Pseudo-First Order | ||||
Temperature (K) | qe,exp (mg·g−1) | k1 (min−1) | qe,calc (mg·g−1) | R2 |
298 | 24.70 | 0.0378 | 12.36 | 0.9783 |
308 | 24.87 | 0.0465 | 13.80 | 0.9829 |
318 | 24.92 | 0.0509 | 13.32 | 0.9834 |
Pseudo-Second Order | ||||
Temperature (K) | qe,exp (mg·g−1) | k2 (g·mg−1∙min−1) | qe,calc (mg·g−1) | R2 |
298 | 24.70 | 1510.83 | 28.81 | 0.9904 |
308 | 24.87 | 1670.06 | 28.57 | 0.9904 |
318 | 24.92 | 1838.49 | 28.18 | 0.991 |
Langmuir Isotherm | |||
qm,exp (mg·g−1) | KL (L·mg−1) | qL (mg·g−1) | R2 |
204.3 | 5.76 | 245.8 | 0.9899 |
Freundlich Isotherm | |||
KF (mg·g−1) | 1/nF | R2 | |
227.3 | 0.412 | 0.91612 | |
Sips Isotherm | |||
KS | qS (mg·g−1) | 1/nS | R2 |
0.171 | 228.1 | 9.44 | 0.99551 |
Adsorbent | Adsorption Capacity, mg·g−1 | Adsorption Conditions | Reference |
---|---|---|---|
Chitosan (80% deacetylation) | 6.63 | pH = 6.0, T = 313 K | [10] |
Chitosan perlite | 179.6 | pH = 6.0, T = 313 K | [43] |
Chitosan/activated carbon composite | 52.6 | pH = 6.0, T = 313 K | [44] |
Chitosan coated cotton fiber | 15.74 | pH = 6.5, T = 313 K | [45] |
Chitosan-phenylthiourea resin | 120 | pH = 5.0, T = 313 K | [46] |
Ch-HDTACl | 204.3 | pH > 4.0, T = 298 K | Present paper |
ΔH° (kJ·mol−1) | ΔS° (J·mol−1∙K−1) | ΔG° (kJ·mol−1) | R2 | ||
---|---|---|---|---|---|
298 K | 308 K | 318 K | |||
31.1 | 130.4 | −6.4 | −6.9 | −7.3 | 0.9957 |
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Ardean, C.; Ciopec, M.; Davidescu, C.M.; Negrea, P.; Voda, R. Kinetics and Thermodynamics Studies for Cadmium (II) Adsorption onto Functionalized Chitosan with Hexa-Decyl-Trimethyl-Ammonium Chloride. Materials 2020, 13, 5552. https://doi.org/10.3390/ma13235552
Ardean C, Ciopec M, Davidescu CM, Negrea P, Voda R. Kinetics and Thermodynamics Studies for Cadmium (II) Adsorption onto Functionalized Chitosan with Hexa-Decyl-Trimethyl-Ammonium Chloride. Materials. 2020; 13(23):5552. https://doi.org/10.3390/ma13235552
Chicago/Turabian StyleArdean, Cristina, Mihaela Ciopec, Corneliu Mircea Davidescu, Petru Negrea, and Raluca Voda. 2020. "Kinetics and Thermodynamics Studies for Cadmium (II) Adsorption onto Functionalized Chitosan with Hexa-Decyl-Trimethyl-Ammonium Chloride" Materials 13, no. 23: 5552. https://doi.org/10.3390/ma13235552