Sample | Phase | Crystalline Strucuture | Content (wt%) | Unit cell Parameters (Å) | Particle size (nm) | χ2 |
---|---|---|---|---|---|---|
Fe3O4@C | C | Tetragonal | 2.8 | a=b=2.47 | ||
c= 6.79 | 69.33 | 5.6 | ||||
Fe3O4 | Cubic | 97.2 | a=b=c= 8.38 |
Parameters | Pseudo-first order | Pseudo-second order | Intraparticle diffusion |
---|---|---|---|
k1 (min-1) | 0.0396 | - | - |
k2 (g mg-1 min-1) | - | 0.0126 | - |
C (mg g-1) | - | - | 0.2467 |
kin (mg g-1 min-1/2) | - | - | 1.0102 |
R2 | 0.877 | 0.952 | 0.852 |
Kinects Model | qe (exp.) (mg g-1) | qe (calc) (mg g-1) | Deviation (%) | R2 |
---|---|---|---|---|
pseudo-1ª order | 4.1594 | 4.1998 | 0.0097 | 0.877 |
pseudo-2ª order | 4.1594 | 4.1198 | 0.0095 | 0.952 |
Temperature | Langmuir | Freundlich | Langmuir-Freundlich | |||
---|---|---|---|---|---|---|
25 ºC | qmax (mg g-1) | 7.610 | nf | 2.623 | qmLF (mg g-1) | 14.734 |
bL (L g-1) | 0.173 | kf | 1.924 | bLF (L g-1) | 0.025 | |
RL | 0.162 | mLF | 0.554 | |||
R2 | 0.955 | R2 | 0.989 | R2 | 0.986 | |
35 ºC | qmax (mg g-1) | 5.478 | nf | 2.419 | qmLF (mg g-1) | 5.603 |
bL (L g-1) | 0.099 | kf | 1.049 | bLF (L g-1) | 0.096 | |
RL | 0.252 | mLF | 0.909 | |||
R2 | 0.902 | R2 | 0.921 | R2 | 0.895 | |
45 ºC | qmax (mg g-1) | 3.765 | nf | 2.463 | qmLF (mg g-1) | 3.391 |
bL (L g-1) | 0.079 | kf | 0.680 | bLF (L g-1) | 0.100 | |
RL | 0.296 | mLF | 1.096 | |||
R2 | 0.788 | R2 | 0.824 | R2 | 0.777 |
Temperature °C | ΔS (kJ mol-1 K-1) | ΔH (kJ mol-1) | - ΔG (kJ mol-1) |
---|---|---|---|
25 | 0.156 | 0.055 | 46,505 |
35 | 48.066 | ||
45 | 49.628 |