Parameter First order Second order Elovich model Intraparticle diffusion k1 r2 k2 h R2 b α r2 kid a r2 Concentration (mg/l) 25 0.096 0.893 0.04615 1.12549 0.9858 0.226629 2.436936 0.9716 10.727 0.3877 0.9872 50 0.138 0.824 0.07551 3.94166 0.9932 1.7191 1.828126 0.9775 28.874 0.2976 0.9861 75 0.092 0.765 0.05694 3.72439 0.9904 0.081693 8.750758 0.9864 17.049 0.3522 0.9981 100 0.103 0.701 0.01923 2.09555 0.9629 0.046942 4.544212 0.9716 5.187 0.6257 0.9923 125 0.111 0.714 0.01661 2.40731 0.971 0.036499 5.373516 0.9709 4.34 0.6608 0.999 Adsorbent dose (mg/l) 0.5 0.105 0.705 0.03657 4.98008 0.8944 0.03862 12.0155 0.8498 2.47 1.2399 0.8888 1 0.137 0.738 0.07817 5.14138 0.988 0.094429 17.76161 0.9421 1.845 1.5203 0.9567 1.5 0.126 0.781 0.13581 4.45434 0.9975 0.150231 16.6023 0.9845 1.756 1.5695 0.99 2 0.13 0.842 0.09734 4.28632 0.9964 0.2465 34.16114 0.9738 1.543 1.6719 0.9787 Temp. (°C) 30 0.122 0.556 0.01155 1.83958 0.4781 0.080762 6.029079 0.7632 2.366 1.2558 0.8308 40 0.161 0.586 0.01423 2.20312 0.6996 0.076693 7.338248 0.9097 2.345 1.3094 0.95 50 0.161 0.612 0.02006 2.73224 0.8349 0.086341 11.92138 0.9465 2.019 1.4419 0.9705 60 0.167 0.633 0.02582 3.24569 0.9052 0.096534 19.90073 0.9773 1.814 1.5369 0.9898 pH 2 0.139 0.574 0.07544 3.48189 0.9821 0.141519 13.1182 0.9404 1.808 1.369 0.9689 5 0.131 0.593 0.06749 3.32557 0.9749 0.128961 11.69116 0.9142 1.862 1.3669 0.9458 7 0.153 0.589 0.06426 4.22654 0.9861 0.087207 11.66265 0.9672 2.036 1.4307 0.9871 9 0.114 0.539 0.12810 6.02409 0.9782 0.139243 9.890058 0.9353 1.4696 1.5677 0.8729 11 0.124 0.580 0.067503 3.025719 0.9767 0.185663 79.57334 0.8431 1.901 1.3095 0.9685

Table 3: The adsorption kinetic model rate constants for PPAC.