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Adsorption kinetic studies are significant to determine the efficiency of adsorption and also discover the mechanism and rate-defining step of a chemical reaction. The fitness of experimental data to pseudo-first-order, pseudo-second-order, intraparticle diffusion, and the Boyd model was investigated to explain the adsorption process. All kinetic model parameters and values are shown in Table 3. Based on R2 value, the pseudo-second-order model (Figure 6(a)) is more close-fitting than the pseudo-first-order model (Figure 6(b)), and for the pseudo-second-order model, the experimental adsorption capacity qe,exp. is adjacent to the calculated adsorption capacity qe,cal (Table 3).
Table 3

Cr(VI) adsorption's kinetic parameters onto JSC

ModelsParametersValues
Pseudo-first-order qe,exp, mg/g 2.488 
qe, mg/g 0.698 
K1 0.028 
R2 0.970 
Pseudo-second-order qe,exp, mg/g 2.488 
qe, mg/g 2.531 
K2 0.117 
h, mg/g/min 0.747 
R2 1.000 
Intraparticle diffusion Kid, mg/g/min0.5 0.342–0.011 
C 0.796–2.338 
R2 0.957–0.9995 
Boyd R2 0.970 
ModelsParametersValues
Pseudo-first-order qe,exp, mg/g 2.488 
qe, mg/g 0.698 
K1 0.028 
R2 0.970 
Pseudo-second-order qe,exp, mg/g 2.488 
qe, mg/g 2.531 
K2 0.117 
h, mg/g/min 0.747 
R2 1.000 
Intraparticle diffusion Kid, mg/g/min0.5 0.342–0.011 
C 0.796–2.338 
R2 0.957–0.9995 
Boyd R2 0.970 
Figure 6

Cr(VI) adsorption kinetic onto JSC using different kinetic models: (a) pseudo-first-order, (b) pseudo-second-order, (c) intraparticle diffusion and (d) Boyd.

Figure 6

Cr(VI) adsorption kinetic onto JSC using different kinetic models: (a) pseudo-first-order, (b) pseudo-second-order, (c) intraparticle diffusion and (d) Boyd.

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