Adsorption of Pb (II) Ions by Lemma minor, Potamogeton crispus and Chara vulgaris: Kinetic Modelling

In this stud y, adsorption of Pb (II) ions b y aquatic macroph te Lemma minor, Potamogeton crispus and Chara vulgaris. The effects of pH, initial metal concentration on adsorption were determined. The optimum adsorption pH was determined to be 4 for L. minor and P. crispus and pH 5 for C. vulgaris. Maximum adsorption capacities of adsorbents were determined to be 93.4, 8 8.4 and 64 mgg-1 for L. minor, P. crispus an d C. vulgaris, r espectively. Ads orption efficiency was observed in the order of L. minor  P. crispus  C. vulgaris for removal of Pb (II) ions. The adsorption kinetics were also found to be well-described by the pseudo second-order and intra-particle diffusion models. L. minor, P. crispus and C. vulgaris have different func tional groups, which incl ude carboxy l (-COOH), phosphate (-PO4), amide (-NH2), and hydroxide (-OH) groups. These functional groups are able to react with heavy metal ions in aqueous solution

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