Table 2.
Kinetics models fitting parameters for adsorption of Eu(III) ions onto Phy/B mixtures compared to phyllite (Phy) and bentonite (B)
Phy | Phy/B = 75/25 | Phy/B = 50/50 | Phy/B = 25/75 | B | ||||||
---|---|---|---|---|---|---|---|---|---|---|
PFO | PSO | PFO | PSO | PFO | PSO | PFO | PSO | PFO | PSO | |
pH 4.5, C0 10 mg/L, L:S 100:1 | ||||||||||
q | 1.011 | 1.011 | 1.011 | 1.011 | 1.012 | |||||
qe | 1.019 | 1.069 | 1.009 | 1.032 | 1.008 | 1.047 | 1.008 | 1.047 | 1.01 | 1.042 |
k1, k2 | 0.2248 | 0.3403 | 0.2064 | 0.3338 | 0.2074 | 0.3416 | 0.2059 | 0.3457 | 0.2029 | 0.3515 |
R2 | 0.9516 | 0.9455 | 0.9985 | 0.9796 | 0.9954 | 0.9879 | 0.9964 | 0.9948 | 0.9899 | 0.9809 |
SSE | 0.0772 | 0.1429 | 0.0080 | 0.0271 | 0.0153 | 0.0138 | 0.0033 | 0.0138 | 0.0093 | 0.0118 |
χ2 | 0.0291 | 0.0913 | 0.0011 | 0.0293 | 0.0161 | 0.0093 | 0.0031 | 0.0041 | 0.0111 | 0.0137 |
pH 4.5, C0 200 mg/L, L:S 100:1 | ||||||||||
q | 3.50 | 6.60 | 13.65 | 16.80 | 19.71 | |||||
qe | 3.189 | 3.510 | 6.1189 | 6.671 | 12.91 | 13.73 | 15.19 | 16.81 | 19.71 | 21.39 |
k1, k2 | 0.0532 | 0.00833 | 0.0455 | 0.0074 | 0.0456 | 0.0062 | 0.0416 | 0.0043 | 0.0352 | 0.0016 |
R2 | 0.9485 | 0.9891 | 0.9778 | 0.9975 | 0.9605 | 0.9913 | 0.9456 | 0.9858 | 0.9973 | 0.9869 |
SSE | 0.7471 | 0.1586 | 1.435 | 0.1792 | 3.453 | 1.8812 | 10.02 | 5.260 | 1.823 | 5.580 |
χ2 | 0.3649 | 0.0926 | 0.4186 | 0.0451 | 1.098 | 0.2522 | 0.714 | 0.794 | 0.2663 | 0.3052 |
pH 7.0, C0 10 mg/L, L:S 100:1 | ||||||||||
q | 1.01 | 1.014 | 1.014 | 1.014 | 1.01 | |||||
qe | 1.008 | 1.042 | 1.018 | 1.033 | 1.019 | 1.039 | 1.019 | 1.034 | 1.014 | 1.038 |
k1, k2 | 0.4837 | 0.6926 | 0.4831 | 0.6865 | 0.4686 | 0.6060 | 0.4396 | 0.5832 | 0.3316 | 0.5801 |
R2 | 0.9889 | 0.9695 | 0.9829 | 0.9763 | 0.9909 | 0.9704 | 0.9912 | 0.9712 | 0.9891 | 0.9632 |
SSE | 0.0124 | 0.0339 | 0.0173 | 0.0442 | 0.0089 | 0.0289 | 0.0086 | 0.0281 | 0.0115 | 0.0386 |
χ2 | 0.0085 | 0.0205 | 0.0116 | 0.0287 | 0.0065 | 0.0196 | 0.0063 | 0.0319 | 0.0071 | 0.0246 |
pH 7.0, C0 200 mg/L, L:S 100:1 | ||||||||||
q | 7.20 | 12.0 | 18.07 | 19.57 | 20.6 | |||||
qe | 7.053 | 7.741 | 11.96 | 12.71 | 18.03 | 19.11 | 19.42 | 20.60 | 20.06 | 21.52 |
k1, k2 | 0.0561 | 0.0058 | 0.0658 | 0.0055 | 0.0659 | 0.0057 | 0.0676 | 0.0051 | 0.0558 | 0.0039 |
R2 | 0.9949 | 0.9960 | 0.9909 | 0.9701 | 0.9914 | 0.9672 | 0.9923 | 0.9882 | 0.9926 | 0.9902 |
SSE | 0.4169 | 0.3211 | 2.248 | 2.520 | 6.034 | 5.358 | 5.485 | 4.884 | 1.0814 | 4.5168 |
χ2 | 0.2075 | 0.0891 | 0.0713 | 0.2335 | 0.1288 | 0.4789 | 0.6092 | 0.2332 | 0.0661 | 0.2908 |
pH 7.0, C0 10 mg/L, L:S 500:1 | ||||||||||
q | 4.32 | 5.013 | 5.013 | 5.013 | 5.13 | |||||
qe | 4.358 | 4.891 | 5.084 | 5.526 | 5.083 | 5.275 | 5.085 | 5.233 | 4.416 | 5.039 |
k1, k2 | 0.2433 | 0.0561 | 0.2452 | 0.0553 | 0.2145 | 0.0538 | 0.2151 | 0.0517 | 0.2011 | 0.0485 |
R2 | 0.9929 | 0.9809 | 0.9921 | 0.9861 | 0.9914 | 0.9896 | 0.9923 | 0.9954 | 0.9934 | 0.9968 |
SSE | 0.1184 | 0.1104 | 0.2493 | 0.4404 | 0.2440 | 0.2981 | 0.1998 | 0.1191 | 0.5279 | 0.0851 |
χ2 | 0.0284 | 0.1524 | 0.0658 | 0.0665 | 0.0561 | 0.0427 | 0.0404 | 0.0194 | 0.1181 | 0.0163 |
pH 7.0, C0 200 mg/L, L:S 500:1 | ||||||||||
Q | 22.09 | 26.4 | 38.9 | 48.5 | 63.84 | |||||
qe | 20.08 | 21.54 | 25.42 | 27.39 | 37.22 | 40.03 | 49.18 | 49.24 | 61.89 | 66.11 |
k1, k2 | 0.0473 | 0.00325 | 0.0333 | 0.0013 | 0.0362 | 0.00133 | 0.0364 | 0.0013 | 0.0366 | 0.00085 |
R2 | 0.9423 | 0.9879 | 0.9837 | 0.9931 | 0.9933 | 0.9949 | 0.9839 | 0.9541 | 0.9819 | 0.9936 |
SSE | 147.6 | 5.241 | 9.159 | 2.906 | 7.545 | 1.231 | 27.25 | 71.39 | 42.63 | 12.67 |
χ2 | 11.73 | 0.4343 | 0.3529 | 0.2445 | 0.1939 | 0.1717 | 0.7941 | 2.299 | 0.9813 | 0.5506 |
qe (mg/g) the Eu(III) adsorption at equilibrium, k1 (1/min) adsorption rate constant for PFO, k2 (g/mg·min) adsorption rate constant for PSO