Removal of Lead From Aqueous Media Using Carbonized and Acid Treated Orange Peel

A low cost and environment-friendly agriculture waste material, orange peel, was investigated for the removal and accumulation of Pb(II) from water and wastewater. Orange peel treated with acid (AOP) as well as converted into carbon (COP) and the effect of various parameters on biosorption of Pb(II) on AOP and COP was studied. The biosorption of Pb(II) was found to be pH dependant in both cases and maximum biosorption of Pb(II) (100 %) on AOP was achieved at pH 6 and 60 min shaking time while using COP the maximum biosorption (100 %) was obtained at pH 5.5 and 80 min contact time. The monolayer biosorption capacities of AOP and COP were found to be 1 040 mg g−1 and 993 mg g−1 using Langmuir isotherm at room temperature respectively. Similarly Freundlich empirical constants, KF and n obtained for Pb(II) on AOP and on COP were 0.453 L g−1, 1.90 and 0.334 L g−1, 2.51 respectively. For the kinetic study of biosorption of Pb(II) on AOP and COP pseudo-first-order and pseudo-second-order intraparticle d...