Research Article
Kinetics, Isotherm, Thermodynamics, and Recyclability of Exfoliated Graphene-Decorated MnFe2O4 Nanocomposite Towards Congo Red Dye
Table 2
Kinetic parameters of the CR adsorption models over MnFe2O4.
| Kinetic models | Parameters | Concentration (mg/L) | 20 | 30 | 40 | 50 | 60 |
| Pseudo-first-order | k1 (min−1/(mg/L)1/n) | 0.013 | 0.010 | 0.014 | 0.016 | 0.009 | Q1 (mg/g) | 5.12 | 8.67 | 7.13 | 17.31 | 7.42 | R2 | 0.9187 | 0.6957 | 0.9672 | 0.7726 | 0.8762 |
| Pseudo-second-order | k2 (g/(mg·min)) | 0.238 | 0.07 | 0.03 | 0.019 | 0.035 | Q2 (mg/g) | 6.34 | 9.63 | 10.00 | 18.19 | 10.57 | H = k2Q22 | 9.57 | 6.52 | 2.94 | 6.14 | 3.92 | R2 | 0.9663 | 0.8234 | 0.9882 | 0.8312 | 0.9706 |
| Elovich | β (g/mg) | 0.82 | 0.58 | 0.57 | 0.32 | 0.48 | α (mg/(g·min)) | 2.9 | 4.9 | 1.2 | 0.50 | 0.67 | R2 | 0.9592 | 0.8007 | 0.9616 | 0.8472 | 0.9558 |
| Bangham | kB 104 (mL/(g/L)) | 6.82 | 1.17 | 1.96 | 5.01 | 6.39 | αB | 0.559 | 0.434 | 0.327 | 0.590 | 0.475 | R2 | 0.9439 | 0.9272 | 0.9901 | 0.9803 | 0.9333 |
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