adsorption efficiency of iron modified carbons for removal of pb(ii) ions from aqueous solution

Abstract introduction: the lead causes severe damage to several systems of the body, especially to bony tissues. until now, several low-cost biosorbents have been studied for removal of heavy metal ions from aqueous solutions. in the present study, carbonized pomegranate peels were modified with fe2+ and fe3+ ions and then removal of pb(ii) ions from aqueous solution was investigated. materials & methods: the washed granola of pomegranate peel was separately soaked with fecl3 and fecl2 solutions for 24 h. then, the granules were carbonized at 400 ?c for 3 h in a programmable furnace in the atmosphere of nitrogen. the adsorption experiments were carried out for two types of iron-modified carbons by batch adsorption procedures using one variable at a time. results: the optimum conditions included contact time 90 min, initial concentration 50 mg/l, and adsorbent dose, 1.0 g/100 ml solution. maximum removal efficiency was calculated as 80% and 90% for fe3+ and fe2+ impregnated pomegranate peel carbons, respectively. the maximum adsorption capacity estimated by means of the langmuir model was 34.5 and 17.8 mg.g-1 for two adsorbents.conclusion: the surfaces of iron treatment pomegranate peel carbons were well modified for adsorption of heavy metals. the results showed that chemical modification of the low-cost adsorbents originating from agricultural waste has stood out for lead removal capabilities.