Mechanism-Enhanced Active Attapulgite-Supported Nanoscale Zero-Valent Iron for Efficient Removal of Pb2+ from Aqueous Solution
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation of nZVI@ATP
2.3. Characterization of Adsorbents
2.4. Batch Experiments
3. Results and Discussion
3.1. Characterizations of Materials
3.2. Effect of Different Materials and Nanoscale Zero-Valent Iron Loading on Pb2+ Removal
3.3. Sorption Kinetics and Isotherms (Adsorption Properties)
3.3.1. Sorption Kinetics
3.3.2. Adsorption Isotherms and Thermodynamic
3.4. Effects of Solution pH on Pb2+ Removal Capacity
3.5. Influence of Coexisting Cations
3.6. Pb2+ Removal of Mechanisms by nZVI@ATP
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | nZVI@ATP |
---|---|
BET Surface area (m2/g) | 25.413 |
BJH Adsorption cumulative surface area of pores (m2/g) | 19.993 |
Single point adsorption total pore volume of pores (cm3/g) | 4.593 × 10−2 |
BJH Adsorption cumulative volume of pores (cm3/g) | 4.391 × 10−2 |
Adsorption average pore width (4V/A by BET) (nm) | 7.229 |
Sample | Carrier | C0 (mg/L) | T (K) | pH | Dosage (g/L) | Qt (mg/g) | Ref. |
---|---|---|---|---|---|---|---|
Zeolite and nanoscale zero-valent iron | Zeolite | 100 | 308 | 4 | 1 | 96.2 | [29] |
Kaolin supported nZVI | Kaolin | 500 | 303.15 | * | 5 | 440.5 | [30] |
nZVI-HCS | Hydrophilic corn stalk | 50 | 298 | 7 | 0.25 | 195.1 | [31] |
Montmorillonite-supported nZVI | Montmorillonite | 50 | 298 | 5 | 5 | 10.65 | [32] |
nZVI@ATP | ATP | 700 | 298 | 5 | 1 | 578.77 | This work |
C0 | Pseudo-First-Order Kinetic Model | Pseudo-Second-Order Kinetic Model | ||||
---|---|---|---|---|---|---|
qm1 | k1 | R12 | qm2 | k2 | R22 | |
700 mg/L | 554.0631 | 3.3173 | 0.7701 | 578.7727 | 0.0098 | 0.9614 |
C0 | kd1 | E1 | R2 | kd2 | E2 | R2 |
---|---|---|---|---|---|---|
700 mg/L | 124.4606 | 324.7125 | 0.9356 | 7.8813 | 546.9407 | 0.9761 |
T/K | Langmuir | Freundlich | Temkin | ||||||
---|---|---|---|---|---|---|---|---|---|
qm | KL | R2 | KF | R2 | A | Kt | R2 | ||
298 | 618.1546 | 0.4935 | 0.8909 | 486.6824 | 0.0440 | 0.9730 | 25.8522 | 1.0512 × 108 | 0.9759 |
308 | 747.8679 | 2.0096 | 0.8456 | 561.5242 | 0.0680 | 0.9842 | 46.1529 | 1.6551 × 105 | 0.9887 |
318 | 777.6810 | 24.2099 | 0.7725 | 653.3360 | 0.0548 | 0.9710 | 38.0106 | 3.4127 × 107 | 0.9678 |
Kd | C0 (mg/L) | ΔHo (kJ/mol) | ΔSo (J/(mol·K)) | ΔGo (kJ/mol) | ||
---|---|---|---|---|---|---|
298 K | 308 K | 318 K | ||||
Kd = qe/Ce (mL/g) | 550 | 204.876 | 717.688 | −8.995 | −16.172 | −23.349 |
600 | 230.271 | 795.176 | −6.692 | −14.643 | −22.595 | |
650 | 206.058 | 709.607 | −5.405 | −12.501 | −19.597 | |
700 | 127.144 | 441.172 | −4.325 | −8.737 | −13.149 | |
750 | 116.786 | 404.169 | −3.657 | −7.698 | −11.740 | |
800 | 91.081 | 315.223 | −2.856 | −6.008 | −9.160 | |
850 | 87.577 | 302.014 | −2.423 | −5.443 | −8.463 | |
900 | 70.817 | 244.507 | −2.046 | −4.491 | −6.936 | |
950 | 57.215 | 197.816 | −1.734 | −3.712 | −5.691 |
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Dai, L.; Meng, K.; Zhao, W.; Han, T.; Lei, Z.; Ma, G.; Tian, X.; Ren, J. Mechanism-Enhanced Active Attapulgite-Supported Nanoscale Zero-Valent Iron for Efficient Removal of Pb2+ from Aqueous Solution. Nanomaterials 2022, 12, 1591. https://doi.org/10.3390/nano12091591
Dai L, Meng K, Zhao W, Han T, Lei Z, Ma G, Tian X, Ren J. Mechanism-Enhanced Active Attapulgite-Supported Nanoscale Zero-Valent Iron for Efficient Removal of Pb2+ from Aqueous Solution. Nanomaterials. 2022; 12(9):1591. https://doi.org/10.3390/nano12091591
Chicago/Turabian StyleDai, Liang, Kai Meng, Weifan Zhao, Tao Han, Zhenle Lei, Gui Ma, Xia Tian, and Jun Ren. 2022. "Mechanism-Enhanced Active Attapulgite-Supported Nanoscale Zero-Valent Iron for Efficient Removal of Pb2+ from Aqueous Solution" Nanomaterials 12, no. 9: 1591. https://doi.org/10.3390/nano12091591