Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation of MnO2@La(OH)3 Nanocomposite
2.3. Characterization of Adsorbents before and after as Removal
2.4. Batch Adsorption Experiments
2.5. Statistical Analysis
3. Results and Discussion
3.1. Characterization of MnO2@La(OH)3 Nanocomposite
3.1.1. SEM and TEM Analysis
3.1.2. Specific Surface Area
3.1.3. Point of Zero Charge
3.2. Arsenic Adsorption Performance
3.2.1. Adsorption Kinetics
3.2.2. Effect of Adsorbent Dosage
3.2.3. Effect of Solution pH
3.2.4. Adsorption Isotherms
3.2.5. Effect of Co-Existing Oxyanions
3.2.6. Regeneration and Reusability
3.3. Adsorption Mechanisms
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Arsenic | Pseudo-First-Order Kinetic Model | Pseudo-Second-Order Kinetic Model | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
k1 (h−1) | qe (mg/g) | R2 | MSE (mg/g)2 | ARE (%) | k2 (g/(mg h)) | qe (mg/g) | R2 | MSE (mg/g)2 | ARE (%) | |
As(V) | 0.846 | 117.33 | 0.858 | 200.77 | 18.07 | 0.00872 | 129.87 | 0.995 | 100.83 | 12.52 |
As(III) | 0.098 | 140.54 | 0.993 | 14.79 | 11.41 | 0.00946 | 127.82 | 0.892 | 892.61 | 262.22 |
Arsenic | Langmuir Model | Freundlich Model | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
kL (L/mg) | qmax (mg/g) | R2 | MSE (mg/g)2 | ARE (%) | kF ((mg/g)·(mg/L)−1/n) | 1/n | R2 | MSE (mg/g)2 | ARE (%) | |
As(V) | 3.429 | 138.9 | 0.994 | 837.37 | 13.65 | 116.52 | 0.0521 | 0.990 | 1.51 | 0.80 |
As(III) | 6.501 | 139.9 | 0.999 | 1330.3 | 33.75 | 126.23 | 0.0423 | 0.991 | 78.12 | 7.37 |
Adsorbent | pH | qmax (mg/g) | Ref. | |
---|---|---|---|---|
As(V) | As(III) | |||
MnO2@La(OH)3 | 4.0 | 138.9 | 139.9 | This study |
Mg-Fe-Ala-LDH | 6.0 | 49.8 | 23.6 | [8] |
Ferrihydrite | 3.0 | 142.86 | n.a. | [12] |
Fe–Mn composite | 5.0 | 69.75 | 132.75 | [41] |
β-FeOOH NRs/CF monolith | 6.0 | 172.9 | 103.4 | [23] |
CF@Mn-FeOOH | 7.0 | 107.3 | 152.5 | [31] |
Fe–Mn composite oxide | 7.0 | 31.68 | 59.44 | [33] |
α-FeOOH QDs@GO | n.a. | 42.54 | 147.38 | [24] |
Mn–Fe binary oxide a | – | 50 | 50 | [62] |
Ca–Al–Fe ternary composites | n.a. | n.a. | 56.86 | [56] |
Cerium oxide modified activated carbon | 5.0 | 43.6 | 36.8 | [55] |
Ball-milled magnetite | n.a. | 3.2 | 5.8 | [63] |
Cu–TiO2 | 7.5 | 19.719 | 24.244 | [35] |
FeMnOx/RGO | 7.0 | 49.01 | 47.5 | [64] |
Hydrous cerium oxide modified graphene | 4.0 | 62.33 | n.a. | [65] |
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Wang, Y.; Guo, C.; Zhang, L.; Lu, X.; Liu, Y.; Li, X.; Wang, Y.; Wang, S. Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption. Int. J. Environ. Res. Public Health 2022, 19, 10649. https://doi.org/10.3390/ijerph191710649
Wang Y, Guo C, Zhang L, Lu X, Liu Y, Li X, Wang Y, Wang S. Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption. International Journal of Environmental Research and Public Health. 2022; 19(17):10649. https://doi.org/10.3390/ijerph191710649
Chicago/Turabian StyleWang, Yulong, Chen Guo, Lin Zhang, Xihao Lu, Yanhong Liu, Xuhui Li, Yangyang Wang, and Shaofeng Wang. 2022. "Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption" International Journal of Environmental Research and Public Health 19, no. 17: 10649. https://doi.org/10.3390/ijerph191710649