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The effect of initial Cr(VI) concentration on the kinetics of Cr(VI) adsorption was studied. It was shown that equilibrium had been achieved. The plot of Log(qeq) versus time is a straight line indicating the applicability of Lagergren equation. The kinetics of Cr(VI) adsorption on the adsorbent was found to follow the first-order rate law derived by following the Lagergren equation. The values of Kad and regression coefficients (R2) for ET and EU were calculated and are shown in Table 2.
formula
where qe and q are the amount of Cr(VI) adsorbed at equilibrium and at any time in mg/g.
Table 2

Rate constant of adsorption (Kad) and intraparticle diffusion constant for Cr(VI) removal

AdsorbentRate constantR2Intraparticle diffusion constant ki (mg/g min0.5)R2
ET (0.3 mm) 2.1 × 10−2 0.99 5.636 0.87 
ET (1 mm) 1.6 × 10−2 0.98 2.092 0.90 
EU (0.3 mm) 2.5 × 10−2 0.99 6.448 0.98 
EU (1 mm) 2.2 × 10−2 0.99 6.018 0.97 
AdsorbentRate constantR2Intraparticle diffusion constant ki (mg/g min0.5)R2
ET (0.3 mm) 2.1 × 10−2 0.99 5.636 0.87 
ET (1 mm) 1.6 × 10−2 0.98 2.092 0.90 
EU (0.3 mm) 2.5 × 10−2 0.99 6.448 0.98 
EU (1 mm) 2.2 × 10−2 0.99 6.018 0.97 
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