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Table 7

Kinetic parameters by non linear method for the adsorption of reactive dyes onto CTS/MMT

Kinetic modelParametersReactive dye
RB5RR136RY145RB222
  qe,exp 258.96 403.62 317.23 269.16 
Avrami fractionary order qe,cal 250.06 395.74 311.15 265.66 
 kAv 0.031 0.045 0.038 0.029 
 nAv 0.750 0.682 0.695 0.740 
 R2 0.9998 0.9998 0.9996 0.9996 
 χ2 0.030 0.033 0.050 0.057 
Pseudo-first-order qe,cal 237.07 377.51 294.44 250.15 
 k1 0.036 0.050 0.044 0.035 
 R2 0.9834 0.9701 0.9735 0.9813 
 χ2 3.761 6.689 5.608 4.510 
Pseudo-second-order qe,cal 275.41 422.52 334.38 291.58 
 k2 × 104 1.55 1.60 1.67 1.41 
 R2 0.9990 0.9984 0.9987 0.9989 
 χ2 0.162 0.225 0.190 0.190 
Elovich α 24.57 96.70 50.22 24.27 
 β 0.0175 0.0137 0.0160 0.0163 
 R2 0.9711 0.9552 0.9660 0.9746 
 χ2 3.964 6.485 4.590 3.731 
Intra-particle diffusion kp 13.34 17.40 14.86 14.29 
 CP 72.40 169.37 114.76 73.20 
 RP2 0.8738 0.8314 0.8557 0.8821 
 χ2 18.657 25.671 20.667 18.826 
Kinetic modelParametersReactive dye
RB5RR136RY145RB222
  qe,exp 258.96 403.62 317.23 269.16 
Avrami fractionary order qe,cal 250.06 395.74 311.15 265.66 
 kAv 0.031 0.045 0.038 0.029 
 nAv 0.750 0.682 0.695 0.740 
 R2 0.9998 0.9998 0.9996 0.9996 
 χ2 0.030 0.033 0.050 0.057 
Pseudo-first-order qe,cal 237.07 377.51 294.44 250.15 
 k1 0.036 0.050 0.044 0.035 
 R2 0.9834 0.9701 0.9735 0.9813 
 χ2 3.761 6.689 5.608 4.510 
Pseudo-second-order qe,cal 275.41 422.52 334.38 291.58 
 k2 × 104 1.55 1.60 1.67 1.41 
 R2 0.9990 0.9984 0.9987 0.9989 
 χ2 0.162 0.225 0.190 0.190 
Elovich α 24.57 96.70 50.22 24.27 
 β 0.0175 0.0137 0.0160 0.0163 
 R2 0.9711 0.9552 0.9660 0.9746 
 χ2 3.964 6.485 4.590 3.731 
Intra-particle diffusion kp 13.34 17.40 14.86 14.29 
 CP 72.40 169.37 114.76 73.20 
 RP2 0.8738 0.8314 0.8557 0.8821 
 χ2 18.657 25.671 20.667 18.826 

Adsorption conditions: initial concentration of dyes 200 mg/L, adsorbent dosage 0.4 g/L, contact time 10–240 min, pH and temperature at the optimum condition as shown in Table 5.

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