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From Table 1 it is observed that the pseudo-second-order kinetic equation showed high correlation coefficients (R2 > 0.999) for all three concentrations of aniline. In addition, the calculated qe from the pseudo-second-order kinetic model was closely similar to the experimental qe for aniline adsorption by AC coated by chitosan. Therefore, the pseudo-second-order kinetic model may be applied to predict the kinetic behavior of aniline adsorption. Besides, the values of the pseudo-second-order rate constant (k2) were calculated as 0.138 mg/(g·min), 0.268 mg/(g·min) and 0.408 mg/(g·min) at the three selected concentrations: 20 mg/L, 50 mg/L and 100 mg/L, respectively. As observed, the k2 value for aniline adsorption by AC coated by chitosan increased with increasing aniline concentrations. An increase in k2 value indicated an increase in adsorption rate, and thus the equilibrium time was shortened. This result was in accordance with the phenomena mentioned previously in this section.

Table 1

Pseudo-second-order parameters of aniline adsorption onto AC coated by chitosan

Parameters (mg/L)qe (exp)k2qe (cal)R2
20 4.520 0.138 4.708 1.0000 
50 9.815 0.268 10.246 0.9996 
100 17.144 0.408 16.929 1.0000 
Parameters (mg/L)qe (exp)k2qe (cal)R2
20 4.520 0.138 4.708 1.0000 
50 9.815 0.268 10.246 0.9996 
100 17.144 0.408 16.929 1.0000 

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