Removal of Arsenic (V) from Aqueous Solutions Using Chitosan–Red Scoria and Chitosan–Pumice Blends
Abstract
:1. Introduction
2. Materials and Methods
2.1. Adsorbent Preparation
2.2. Adsorbent Characterization
2.2.1. Chemical Composition
2.2.2. Determination of pH and Point of Zero Charge
2.3. Chemicals
2.4. Analytical Procedures
2.5. Batch Arsenic Adsorption Studies
2.6. Regeneration of the Spent Adsorbents
3. Results and Discussion
3.1. Adsorbent Characterization
3.1.1. Chitosan Loaded on Rs and Pu
3.1.2. Chemical Composition
3.1.3. pH and Point of Zero Charge
3.2. Adsorption of As (V) on Ch–Rs and Ch–Pu Blends
3.2.1. Preliminary Adsorption Experiments
3.2.2. Effect of Contact Time
3.2.3. Adsorption Kinetics
3.2.4. Influence of pH
3.2.5. Optimization of Adsorbent Dose
3.2.6. Effect of Initial Concentration
3.2.7. Adsorption Isotherm
3.2.8. Effect of Co-Existing Anions
3.2.9. Desorption of As (V) from Ch–Rs and Ch–Pu Surfaces
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Elements | Pumice % (wt) | Red Scoria % (wt) | Oxides | Pumice % (wt) | Red Scoria % (wt) |
---|---|---|---|---|---|
Si | 27.3 | 18.4 | SiO2 | 69.2 | 42.2 |
Al | 5.6 | 9.7 | Al2O3 | 11.9 | 18.4 |
Fe | 3.3 | 8.1 | FeO | 5.8 | 13.0 |
K | 3.9 | 0.3 | CaO | 0.9 | 11.1 |
Ca | 0.2 | 6.3 | K2O | 6.3 | 0.6 |
Na | 1.0 | 2.3 | Na2O | 1.6 | 3.4 |
Mn | <0.1 | 0.1 | CuO | 1.7 | 1.6 |
Mg | <0.1 | 2.2 | ZnO | 1.3 | 1.3 |
Zn | <0.1 | <0.1 | NiO | 1.0 | 1.9 |
Cr | <0. 1 | <0.1 | MnO | 0.1 | 0.2 |
Cu | <0. 1 | <0.1 | MgO | 4.1 | |
Co | <0.1 | <0.1 | TiO2 | 2.3 | |
Cd | <0.1 | <0.1 | |||
Ni | <0.1 | <0.1 | |||
Pb | <0.1 | <0.1 | |||
As | <0.1 | <0.1 |
Parameter | Ch–Rs | Ch–Pu | ||||||
---|---|---|---|---|---|---|---|---|
Pseudo-First-Order | Pseudo-Second-Order | Pseudo-First-Order | Pseudo-Second-Order | |||||
C0 (mg/L) | 0.25 | 2.0 | 0.25 | 2.0 | 0.25 | 2.0 | 0.25 | 2.0 |
qe,exp(mg/g) | 0.032 | 0.234 | 0.032 | 0.234 | 0.028 | 0.224 | 0.028 | 0.224 |
qe,cal(mg/g) | 0.030 | 0.234 | 0.031 | 0.235 | 0.028 | 0.224 | 0.028 | 0.225 |
k1 (min−1) | 0.628 | 0.582 | - | - | 0.536 | 0.574 | - | - |
k2(g/(mg min)) | - | - | 126.88 | 12.72 | - | - | 85.36 | 13.34 |
V0(mg/(g min)) | - | - | 0.130 | 0.697 | - | - | 0.067 | 0.669 |
R2 | 0.80706 | 0.77013 | 0.94773 | 0.9303 | 0.8837 | 0.88446 | 0.98627 | 0.96758 |
χ2 | 4.93 × 10−8 | 5.76 × 10−6 | 1.34 × 10−8 | 1.75 × 10−6 | 5.99 × 10−8 | 2.55 × 10−6 | 7.07 × 10−9 | 7.17 × 10−7 |
Isotherm | Parameters | Ch–Rs | Ch–Pu |
---|---|---|---|
Langmuir | qmax (mg/g) | 0.722 | 0.710 |
B (L/mg) | 1.551 | 1.712 | |
RL | 0.06–0.86 | 0.06–0.85 | |
R2 | 0.997 | 0.999 | |
χ2 | 8.34 × 10−3 | 8.24 × 10−3 | |
Freundlich | KF ((mg1−1/n L1/n)/g) | 0.361 | 0.363 |
n | 2.318 | 2.374 | |
R2 | 0.953 | 0.938 | |
χ2 | 2.618 | 2.722 |
Adsorbent | Initial pH | Qmax (mg/g) | References |
---|---|---|---|
Feldspar | 3 | 0.24 | [63] |
Manganese oxide coated zeolite | 7 | 0.15 | [64] |
Magnetic iron oxide nanoparticles coated on sand | 7 | 0.29 | [65] |
Iron-oxide coated sands | 7 | 0.021 | [66] |
Fe(III)–Sn(IV) mixed oxide-coated sand | 7 | 0.23 | [67] |
Kaolinite | 0.86 | [68] | |
Laterite soil | 5.7 | 0.04 | [69] |
Rice polish | 4 | 0.15 | [70] |
Modified zeolite Y | 6 | 1.34 | [71] |
Fish scale | 4 | 0.027 | [72] |
Bone char | 10 | 1.43 | [73] |
Red mud | 3.5 | 0.52 | [74] |
Red mud | 2.3 | 0.51 | [75] |
Natural Muscovite | 6 | 0.79 | [76] |
Iron oxide coated sand | 7 | 0.099 | [77] |
Ch–Rs | 7 | 0.72 | This study |
Ch–Pu | 7 | 0.71 | This study |
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Asere, T.G.; Mincke, S.; De Clercq, J.; Verbeken, K.; Tessema, D.A.; Fufa, F.; Stevens, C.V.; Du Laing, G. Removal of Arsenic (V) from Aqueous Solutions Using Chitosan–Red Scoria and Chitosan–Pumice Blends. Int. J. Environ. Res. Public Health 2017, 14, 895. https://doi.org/10.3390/ijerph14080895
Asere TG, Mincke S, De Clercq J, Verbeken K, Tessema DA, Fufa F, Stevens CV, Du Laing G. Removal of Arsenic (V) from Aqueous Solutions Using Chitosan–Red Scoria and Chitosan–Pumice Blends. International Journal of Environmental Research and Public Health. 2017; 14(8):895. https://doi.org/10.3390/ijerph14080895
Chicago/Turabian StyleAsere, Tsegaye Girma, Stein Mincke, Jeriffa De Clercq, Kim Verbeken, Dejene A. Tessema, Fekadu Fufa, Christian V. Stevens, and Gijs Du Laing. 2017. "Removal of Arsenic (V) from Aqueous Solutions Using Chitosan–Red Scoria and Chitosan–Pumice Blends" International Journal of Environmental Research and Public Health 14, no. 8: 895. https://doi.org/10.3390/ijerph14080895