Purification Behavior of Zn(II) in Water by Magnesium Hydroxyapatite: Surface Complexation, and Dissolution–Precipitation
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation
2.2. Characterization
2.3. Adsorption Experiments
3. Results
3.1. Characterization of the Sorbent
3.1.1. Powder X-ray Diffraction
3.1.2. Scanning Electron Microscope (SEM) and Energy Dispersive Spectrum (EDS)
3.1.3. Fourier Transform Infrared Spectrometer (FTIR)
3.2. Influences of Adsorption Conditions
3.2.1. Influence of Initial Solution pH
3.2.2. Influence of Initial Concentration and Temperature
3.2.3. Influence of Sorbent Dosage
3.2.4. Influence of Contact Time
3.3. Sorption Dynamics and Isotherm
3.3.1. Sorption Dynamics
3.3.2. Adsorption Isotherm
3.4. Adsorption Thermodynamics
3.5. Adsorption Mechanisms
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Model | Initial Concentration (mg/L) | Equation | qe (mg/g) | R2 |
---|---|---|---|---|
Pseudo-First-Order Dynamics | 10 | ln(qe − qt) = −0.0064t + 0.2832 | 1.3274 | 0.8729 |
20 | ln(qe − qt) = −0.0068t + 1.3503 | 3.8586 | 0.8695 | |
50 | ln(qe − qt) = −0.0017t + 1.7492 | 5.7500 | 0.8688 | |
Pseudo-Second-Order Dynamics | 10 | t/q = 0.0678t + 0.1822 | 14.75 | 1.0000 |
20 | t/q = 0.0507t + 0.2270 | 19.72 | 1.0000 | |
50 | t/q = 0.0335t + 0.2313 | 29.85 | 0.9999 | |
Morrist Particle Intimal Diffusion | 10 | qt = 0.0328t1/2 + 13.807 | - | 0.6803 |
20 | qt = 0.0953t1/2 + 17.027 | - | 0.7976 | |
50 | qt = 0.2357t1/2 + 23.888 | - | 0.7883 | |
Elovich Equation | 10 | qt = 0.2348lnt + 13.165 | - | 0.9249 |
20 | qt = 0.6561lnt + 15.292 | - | 0.9769 | |
50 | qt = 1.3631 lnt + 20.677 | - | 0.9783 |
Pseudo-Second-Order Constants | ||||
---|---|---|---|---|
Initial Zn(II) Concentration (mg/L) | k2 (g/(mg·min)) | h (mg/(g·min)) | qe (mg/g) | R2 |
10 | 0.1822 | 39.6399 | 14.75 | 1.0000 |
20 | 0.2770 | 107.7193 | 19.72 | 1.0000 |
50 | 0.2313 | 206.0935 | 29.85 | 0.9999 |
Langmuir Constants | ||||
---|---|---|---|---|
Temperature (°C) | qm (mg/g) | KL (L/mg) | RL | R2 |
25 | 62.11 | 0.0378 | 0.0065−0.1634 | 0.9677 |
35 | 70.92 | 0.0520 | 0.0047−0.1241 | 0.9608 |
45 | 85.47 | 0.1175 | 0.0039−0.1047 | 0.9821 |
T (k) | ΔGθ (KJ/mol) | ΔHθ (KJ/mol) | ΔSθ (KJ/(mol·K)) |
---|---|---|---|
298 | −10.399 | 20.2018 | 0.1028 |
308 | −11.573 | ||
318 | −12.456 |
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Mo, N.; Zhu, Z.; Zhu, Y.; Liu, Y.; Wang, X.; Yang, H.; Zhao, N. Purification Behavior of Zn(II) in Water by Magnesium Hydroxyapatite: Surface Complexation, and Dissolution–Precipitation. Int. J. Environ. Res. Public Health 2020, 17, 3804. https://doi.org/10.3390/ijerph17113804
Mo N, Zhu Z, Zhu Y, Liu Y, Wang X, Yang H, Zhao N. Purification Behavior of Zn(II) in Water by Magnesium Hydroxyapatite: Surface Complexation, and Dissolution–Precipitation. International Journal of Environmental Research and Public Health. 2020; 17(11):3804. https://doi.org/10.3390/ijerph17113804
Chicago/Turabian StyleMo, Nan, Zongqiang Zhu, Yinian Zhu, Yang Liu, Xingxing Wang, Hongqu Yang, and Ningning Zhao. 2020. "Purification Behavior of Zn(II) in Water by Magnesium Hydroxyapatite: Surface Complexation, and Dissolution–Precipitation" International Journal of Environmental Research and Public Health 17, no. 11: 3804. https://doi.org/10.3390/ijerph17113804