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Figures 1012 show the fitting of adsorption kinetics data of Pb(II) on 0.1 g CA/Fe3O4 NFs (2.5% wt/v) in 50 ml solution at pH = 6 and 27 °C to PFO, PSO and IDMs, respectively. The three models’ parameters are tabulated in Table 2.
Table 2

Kinetic parameters calculated from different kinetic models for the adsorption of Pb(II) on CA/Fe3O4 (2.5% wt/v) NFs

ModelPb(II)
10 ppm20 ppm50 ppm100 ppm
PFO 
R2 0.8852 0.8852 0.9605 0.9674 
qe model (mg/g) 3.2374 3.1953 3.6060 5.2398 
qe experimental (mg/g) 5.1 24.1 47.01 
χ2 457.750 
K1 (min−10.0392 0.0349 0.0335 0.0313 
PSO 
R2 0.9958 0.9962 0.997 0.9996 
qe model (mg/g) 6.3251 8.9206 25.1256 48.7804 
qe experimental (mg/g) 5.1 24.1 47.01 
χ2 0.4384 
K2 (g mg−1 min−10.0249 0.0125 0.0015 0.0004 
Intra-particle diffusion 
R2 0.9756 0.9753 0.9744 0.9836 
Kid (mg/g min1/20.6059 1.2252 1.2469 3.6532 
ModelPb(II)
10 ppm20 ppm50 ppm100 ppm
PFO 
R2 0.8852 0.8852 0.9605 0.9674 
qe model (mg/g) 3.2374 3.1953 3.6060 5.2398 
qe experimental (mg/g) 5.1 24.1 47.01 
χ2 457.750 
K1 (min−10.0392 0.0349 0.0335 0.0313 
PSO 
R2 0.9958 0.9962 0.997 0.9996 
qe model (mg/g) 6.3251 8.9206 25.1256 48.7804 
qe experimental (mg/g) 5.1 24.1 47.01 
χ2 0.4384 
K2 (g mg−1 min−10.0249 0.0125 0.0015 0.0004 
Intra-particle diffusion 
R2 0.9756 0.9753 0.9744 0.9836 
Kid (mg/g min1/20.6059 1.2252 1.2469 3.6532 
Figure 10

PFO plot of Pb(II) adsorption on 0.1 g CA/Fe3O4 NFs (2.5% wt/v) in 50 ml solution at pH = 6 and 27 °C.

Figure 10

PFO plot of Pb(II) adsorption on 0.1 g CA/Fe3O4 NFs (2.5% wt/v) in 50 ml solution at pH = 6 and 27 °C.

Figure 11

PSO plot of Pb(II) adsorption on 0.1 g CA/Fe3O4 NFs (2.5% wt/v) in 50 ml solution at pH = 6 and 27 °C.

Figure 11

PSO plot of Pb(II) adsorption on 0.1 g CA/Fe3O4 NFs (2.5% wt/v) in 50 ml solution at pH = 6 and 27 °C.

Figure 12

Intra-particle diffusion plot of Pb(II) adsorption on 0.1 g CA/Fe3O4 NFs (2.5% wt/v) in 50 ml solution at pH = 6 and 27 °C.

Figure 12

Intra-particle diffusion plot of Pb(II) adsorption on 0.1 g CA/Fe3O4 NFs (2.5% wt/v) in 50 ml solution at pH = 6 and 27 °C.

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