An Investigation of Langmuir and Freundlich Isotherms for Removing of Pb+2ions from Aqueous Solutions by Using Modified Reed

To overcome a drinking water contamination by heavy metals, effective low cost methods for removing heavy metals from aqueous solutions are required. In this study, reed straw was modified by using citric acid at thermal reaction, at different time and different temperatures used to remove Pb +2 ions from aqueous solutions. The best result for removing Pb +2 ions was giving at a modification time of 12 h and 120°C.The formation of cellulose _ citric acid cross-linking was confirmed by using FTIR spectrum. The b value of Langmuir isotherm was found to be 6.8 L/mg and qmax45.45 mg/g. The Freundlich constant kf was 0.91 mg/g and the n value was 3.06.