Residence Time Effects on Molybdenum Adsorption on Soils: Elucidation by Multi-Reaction Modeling and XANES Analysis
Abstract
:1. Introduction
2. Materials and Methods
2.1. Material
2.2. Kinetic Batch Experiments
2.3. Sequential Extractions
2.4. Mo K Edge XANES Analysis
2.5. Multi-Reaction Model
3. Results
3.1. Mo Sorption Kinetics
3.2. Multi-Reaction Modeling and Reaction Mechanisms
3.3. Mo K Edge XANES Analysis
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Soil | Webster | Windsor | Mahan |
---|---|---|---|
pH | 6.92 | 6.11 | 6.10 |
TOC a (%) | 4.03 | 2.03 | 1.37 |
CEC b (cmol kg−1) | 27.0 | 2.0 | 7.0 |
CaCO3 (%) | 3.7 | - | - |
Mo (mg kg−1) | 0.52 | 0.93 | 0.59 |
Sand c (%) | 39 | 77 | 49 |
Silt (%) | 39 | 20 | 20 |
Clay (%) | 22 | 3 | 31 |
Clay mineralogical composition d | Smectite (73%), Quartz (11%), Kaolinite (9%), Illite (7%) | Illite (33%), Kaolinite (29%), Chlorite (15%), Smectite (12%), Quartz (10%) | Kaolinite (75%–85%), Mica (5%–10%), Vermiculite (5%), Interlayered, Interstratified (5%–10%) |
Selective extraction by | |||
Ammonium oxalate (pH 3.0) | |||
Fe (g kg−1) | 0.98 | 0.36 | 0.46 |
Al (g kg−1) | 0.89 | 0.69 | 0.22 |
Citrate-bicarbonate-dithionite (CBD) | |||
Fe (g kg−1) | 4.42 | 3.68 | 6.07 |
Al (g kg−1) | 0.77 | 3.65 | 3.65 |
r2 | RMSE a | Keb | k1 | k2 | k3 | ki | |
---|---|---|---|---|---|---|---|
h−1 | |||||||
Mahan soil | |||||||
M1 | 0.375 | 18.10 | - | 4.001 ± 2.271 | 0.677 ± 0.445 | - | - |
M2 | 0.966 | 4.604 | - | 8.275 ± 2.073 | 3.087 ± 0.922 | 0.012 ± 0.0025 | - |
M3 | 0.973 | 4.040 | - | 8.513 ± 2.016 | 3.368 ± 0.949 | - | 0.011 ± 0.0014 |
M4 | 0.973 | 5.185 | - | 8.936 ± 2.822 | 3.776 ± 1.393 | 0.000 ± 0.0009 | 0.013 ± 0.0024 |
M5 | 0.962 | 4.430 | 23.267 ± 2.14 | - | - | - | 0.011 ± 0.0015 |
M6 | 0.961 | 4.843 | 22.91 ± 2.427 | 0.043 ± 0.009 | 0.0019 ± 0.002 | - | - |
M7 | 0.969 | 3.825 | 21.100 ± 2.67 | 1.056 ± 0.030 | 0.309 ± 0.0201 | 0.048 ± 0.004 | - |
M8 | 0.974 | 4.417 | 15.202 ± 10.4 | 1.697 ± 3.747 | 1.534 ± 2.309 | - | 0.011 ± 0.0016 |
M9 | 0.974 | 5.108 | 15.469 ± 10.3 | 1.583 ± 3.400 | 1.438 ± 2.150 | 0.000 ± 0.002 | 0.011 ± 0.0021 |
Windsor soil | |||||||
M1 | 0.848 | 21.71 | - | 0.107 ± 0.049 | 0.006 ± 0.0067 | - | - |
M2 | 0.938 | 7.513 | - | 23.44 ± 2.074 | 9.448 ± 0.7622 | 0.019 ± 0.0057 | - |
M3 | 0.935 | 7.407 | - | 17.22 ± 14.07 | 7.383 ± 6.643 | - | 0.010 ± 0.0020 |
M4 | 0.234 | 57.16 | - | 1.35 ± 1470 | 9.835 ± 15487 | 0.007 ± 833.22 | 1.181 ± 23.51 |
M5 | 0.934 | 6.719 | 24.321 ± 3.77 | - | - | - | 0.010 ± 0.0019 |
M6 | 0.940 | 6.989 | 23.95 ± 4.069 | 0.055 ± 0.014 | 0.002 ± 0.0020 | - | - |
M7 | 0.937 | 5.469 | 24.39 ± 5.148 | 0.750 ± 0.022 | 0.601 ± 0.0048 | 0.015 ± 0.0276 | - |
M8 | 0.942 | 8.462 | 23.50 ± 4.986 | 0.057 ± 0.015 | 0.001 ± 0.0042 | - | 0.000 ± 0.0065 |
M9 | 0.876 | 26.494 | 4.113 ± 6912 | 1.828 ± 6998 | 15.86 ± 4381 | 0.00003 ± 0.27 | 0.019 ± 0.029 |
Webster soil | |||||||
M1 | 0.074 | 2.692 | - | 6.994 ± 3.112 | 4.862 ± 2.273 | - | - |
M2 | 0.665 | 1.722 | - | 8.925 ± 6.213 | 7.036 ± 5.135 | 0.001 ± 0.0005 | - |
M3 | 0.534 | 105.51 | - | 2.539 ± 41.73 | 19.830 ± 0.000 | - | 0.000 ± 0.0115 |
M4 | 0.564 | 66.158 | - | 0.412 ± 1.779 | 0.029 ± 0.392 | 0.000 ± 0.0554 | 0.000 ± 0.421 |
M5 | 0.666 | 1.617 | 12.587 ± 0.71 | - | - | - | 0.0002 ± 0.000 |
M6 | 0.716 | 1.602 | 11.983 ± 0.93 | 0.065 ± 0.004 | 0.008 ± 0.0075 | - | - |
M7 | 0.772 | 1.969 | 11.482 ± 1.33 | 0.016 ± 0.022 | 0.043 ± 0.0835 | 0.005 ± 0.006 | - |
M8 | 0.770 | 1.663 | 11.45 ± 1.112 | 0.012 ± 0.017 | 0.051 ± 0.082 | - | 0.0002 ± 0.000 |
M9 | 0.760 | 2.153 | 11.459 ± 1.40 | 0.006 ± 0.012 | 0.026 ± 0.228 | 0.00003 ± 0.08 | 0.0001 ± 0.002 |
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Sun, W.; Roy, A.; Selim, H.M. Residence Time Effects on Molybdenum Adsorption on Soils: Elucidation by Multi-Reaction Modeling and XANES Analysis. Soil Syst. 2019, 3, 55. https://doi.org/10.3390/soilsystems3030055
Sun W, Roy A, Selim HM. Residence Time Effects on Molybdenum Adsorption on Soils: Elucidation by Multi-Reaction Modeling and XANES Analysis. Soil Systems. 2019; 3(3):55. https://doi.org/10.3390/soilsystems3030055
Chicago/Turabian StyleSun, Wenguang, Amitava Roy, and H. Magdi Selim. 2019. "Residence Time Effects on Molybdenum Adsorption on Soils: Elucidation by Multi-Reaction Modeling and XANES Analysis" Soil Systems 3, no. 3: 55. https://doi.org/10.3390/soilsystems3030055