Variable Langmuir  isotherm model  parameter Friendlier isotherm model  parameter qmax KL RL r2 KF n r2 Temperature 30°C 3.83 9.01 0.0024 0.991 4.92 17.24 0.912 40°C 4.26 7.04 0.0016 0.995 4.87 20.40 0.935 50°C 4.74 6.01 0.0033 0.975 4.85 29.41 0.946 60°C 5.02 5.53 0.0036 0.997 4.79 35.71 0.949 pH 5 3.61 1.091 0.0179 0.986 5.86 5.81 0.93 6 3.89 5.025 0.0039 0.995 4.94 14.92 0.87 7.5 4.56 13.69 0.0014 0.999 4.98 7.93 0.68 8 4.51 17.01 0.0011 0.945 5.10 13.69 0.90 9 3.11 0.245 0.0751 0.966 5.49 6.66 0.91 Adsorbent particle  size (mm) 0.150 4.56 7.191 0.0166 0.988 4.88 7.85 0.90 0.355 3.79 9.225 0.0123 0.985 4.91 10.96 0.89 0.5 3.56 14.69 0.0030 0.999 4.99 12.93 0.75 2.0 2.51 19.41 0.0022 0.965 5.22 13.69 0.80 Adsorbent dose (mg) 0.5 4.61 3.088 0.0109 0.976 5.75 8.83 0.89 1.0 3.39 6.045 0.0059 0.995 5.31 10.94 0.90 1.5 2.46 10.69 0.0034 0.998 4.98 11.95 0.88 2.0 1.9 14.01 0.0023 0.977 5.01 13.69 0.92 Adsorbate concentration (mg/l) 50 3.85 6.650 0.0199 0.986 5.80 12.81 0.91 75 3.78 5.760 0.0133 0.993 4.98 14.95 0.90 100 4.11 10.65 0.0083 0.998 5.22 17.22 0.88 125 3.51 16.09 0.0045 0.985 5.10 20.69 0.85 150 3.03 21.24 0.0013 0.976 5.21 25.65 0.91

Table 1: Langmuir and Freundlich isotherm constants for adsorption of MB onto DPF.