(ppm) pH Contact Time (min) Adsorbent dosage (g l-1) Maximum adsorption capability (mg g-1) References Activated carbon (AC) prepared from coconut tree sawdust 10 3.0 180 0.2 3.46 [29] Raw coconut fiber 250 1.0 270 10 18.60 [30] Sugarcane bagasse 100 2.0 90 10 1.76 [31] Canadian peat Coconut fiber 50 2.0 4320 25 4.61 4.71 [32] peanut shell (P. Shell), sawdust (S. Dust) and Cassia fistula leaves (C.F.
Comment 2: The porosity of the sample should be measured.