First order k1 (min-1) qe (mg/g) R2 second order k2(min-1)qeR2 intra-particle diffusion kd12 (mg/g)R2 kd2 (mg/g)R2 Initial concentration (mg/L) 25 0.0627    4.525 0.889 1.9847    25.575    1 1.6359    0.936     0.0675    0.7864 50 0.0544    9.387 0.734 0.1045    27.100   0.999 1.1192    0.929     0.0937    0.9512 100 0.1743    13.538   0.784 0.0698    23.419   0.998 1.4511    0.813     0.0194    α 200 0.0423    13.279   0.641 0.0493    24.038   0.998 1.8901    0.747     0.1822    0.7535 300 0.0384    15.825   0.598 0.0468   21.276    0.997 3.2479    0.952     0.3152 0.8573 Particle size (mm) 0.125-0.2 0.1401   10.479    0.814 0.2104 8.803   0.996 1.464  0.915    0.0426   α 0.4-0.63 0.0341   18.541    0.935 0.3257    15.240 0.999 2.091  0.992    0.2557   α 0.63-1 0.0253    16.629   0.920 0.5509   25.773   1 1.535   0.926   0.4246   0.867 1-1.25 0.0226    17.101   0.923 0.5560   40.322   0.999 2.481   0.961   0.0613   0.957 1.25-1.6 0.0275    17.995   0.920 0.6428  52.631   1 2.386   0.984   0.7051  0.960 α: for values less than 0.7

Table 2: Kinetic parameters for the adsorption of phenol onto COSAC.