Using One-Step Acid Leaching for the Recovering of Coal Gasification Fine Slag as Functional Adsorbents: Preparation and Performance
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Acid Leaching Process Optimization
2.3. Characterization
2.4. Adsorption Mechanisms Investigation
2.4.1. Adsorption Process
2.4.2. Adsorption Kinetics
2.4.3. Adsorption Isotherm
2.4.4. Adsorption Thermodynamics
2.5. Analysis of Data
3. Results and Discussion
3.1. Acid Leaching Process Optimization
3.1.1. Acid Type Effect
3.1.2. Acid Concentration Effect
3.1.3. Leaching Time Effect
3.1.4. Leaching Temperature Effect
3.2. Optimization of Leaching Conditions
3.3. Characterization of Functional Adsorbents
3.4. Adsorption Mechanisms Investigation
3.4.1. Adsorption Kinetics
3.4.2. Adsorption Isotherm
3.4.3. Adsorption Thermodynamics
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
CGS | Coal gasification slag |
FS | Coal gasification fine slag |
CS | Coal gasification coarse slag |
MB | Methylene blue |
RLE | Leaching efficiency |
CAC | Adsorption capacity |
FS-N-2M-2 h-293K | The sample was obtained by 2.0 mol/L HNO3 at 293 K for 2 h. |
FS-H-2M-2 h-293K | The sample was obtained by 2.0 mol/L HCl at 293 K for 2 h. |
FS-S-2M-2 h-293K | The sample was obtained by 2.0 mol/L H2SO4 at 293 K for 2 h. |
FS-F-2M-2 h-293K | The sample was obtained by 2.0 mol/L HF at 293 K for 2 h. |
FS-C-2M-2 h-293K | The sample was obtained by 2.0 mol/L HAc at 293 K for 2 h. |
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Si | Al | Fe | Ca | Na | Mg | K | S | Ti | Others | LOI | |
---|---|---|---|---|---|---|---|---|---|---|---|
FS | 21.20 | 11.15 | 13.90 | 13.44 | 1.39 | 1.22 | 1.06 | 0.82 | 0.70 | 1.47 | 33.68 |
Pore Diameter (nm) | Total Pore Volume (cc/g) | Surface Area (m2/g) | |
---|---|---|---|
FS | 19.09 | 0.21 | 151.67 |
FS-N-2M-2 h-293K | 3.82 | 0.26 | 340.40 |
FS-H-2M-2 h-293K | 3.83 | 0.48 | 247.21 |
FS-S-2M-2 h-293K | 3.82 | 0.15 | 162.09 |
FS-C-2M-2 h-293K | 3.83 | 0.26 | 159.01 |
FS-F-2M-2 h-293K | 3.83 | 0.12 | 98.83 |
Kinetics Model | Parameters | ||||
---|---|---|---|---|---|
Pseudo-first-order | Qe | K1 | R2 | χ2 | |
156.10 | 0.26784 | 0.523 | 46.665 | ||
Pseudo-second-order | Qe | K2 | R2 | χ2 | |
159.47 | 0.00282 | 0.875 | 12.193 | ||
Weber-Morris model | Part I | Ci | Ki1 | R2 | χ2 |
86.57022 | 15.18055 | 0.90365 | 2.65117 | ||
Part II | c | Ki2 | R2 | χ2 | |
111.009 | 5.381 | 0.979 | 9.32794 | ||
Part III | c | Ki3 | R2 | χ2 | |
151.328 | 0.453 | 0.975 | 0.0452 |
Temperature (K) | Langmuir Isotherm Model | ||||
---|---|---|---|---|---|
KL | Qmax | R2 | ALL | Equation | |
293 | 0.321 | 320.134 | 0.982 | 0.135 | Qe = 102.808Ce/(1 + 0.321Ce) |
303 | 0.244 | 308.616 | 0.916 | 0.170 | Qe = 75.173Ce/(1 + 0.244Ce) |
313 | 0.167 | 287.880 | 0.955 | 0.230 | Qe = 48.145Ce/(1 + 0.167Ce) |
323 | 0.146 | 273.099 | 0.939 | 0.256 | Qe = 39.782Ce/(1 + 0.146Ce) |
Temperature (K) | Freundlich Isotherm Model | ||||
KF | n | R2 | Equation | ||
293 | 127.085 | 4.881 | 0.879 | Qe = 127.085Ce0.205 | |
303 | 107.450 | 4.332 | 0.838 | Qe = 107.45Ce0.231 | |
313 | 100.253 | 4.654 | 0.757 | Qe = 100.253Ce0.215 | |
323 | 92.136 | 4.591 | 0.748 | Qe = 92.136Ce0.218 | |
Temperature (K) | Temkin Isotherm Model | ||||
KT | b | R2 | Equation | ||
293 | 52.087 | 10.268 | 0.952 | Qe = 237.24ln (52.087Ce) | |
303 | 47.291 | 4.179 | 0.901 | Qe = 781.843ln (47.291Ce) | |
313 | 50.494 | 3.025 | 0.854 | Qe = 860.313ln (50.494Ce) | |
323 | 52.595 | 2.567 | 0.839 | Qe = 1046.271ln (52.595Ce) |
ΔG(kJ/mol) | ΔS | ΔH | R2 | |||
---|---|---|---|---|---|---|
293 K | 303 K | 313 K | 323 K | (J/(mol·K)) | (kJ/mol) | |
−4.21 | −3.936 | −3.905 | −3.825 | −82.398 | −37.526 | 0.9366 |
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Li, T.; He, S.; Shen, T.; Sun, J.; Sun, C.; Pan, H.; Yu, D.; Lu, W.; Li, R.; Zhang, E.; et al. Using One-Step Acid Leaching for the Recovering of Coal Gasification Fine Slag as Functional Adsorbents: Preparation and Performance. Int. J. Environ. Res. Public Health 2022, 19, 12851. https://doi.org/10.3390/ijerph191912851
Li T, He S, Shen T, Sun J, Sun C, Pan H, Yu D, Lu W, Li R, Zhang E, et al. Using One-Step Acid Leaching for the Recovering of Coal Gasification Fine Slag as Functional Adsorbents: Preparation and Performance. International Journal of Environmental Research and Public Health. 2022; 19(19):12851. https://doi.org/10.3390/ijerph191912851
Chicago/Turabian StyleLi, Tianpeng, Shaocang He, Tingting Shen, Jing Sun, Chenxu Sun, Haoqi Pan, Dehai Yu, Wenxue Lu, Runyao Li, Enshan Zhang, and et al. 2022. "Using One-Step Acid Leaching for the Recovering of Coal Gasification Fine Slag as Functional Adsorbents: Preparation and Performance" International Journal of Environmental Research and Public Health 19, no. 19: 12851. https://doi.org/10.3390/ijerph191912851