Abstract
ABSTRACT The biosorption of Pb(II) and Cd(II) ions onto thiosalicylic acid modified Isatis tinctoria (TS-I) was investigated. The characterization of I. tinctoria and TS-I were determined by SEM, FT-IR and TGA. The biosorption equilibrium and kinetic data well matched with the Langmuir isotherm and pseudo-second-order kinetic models, respectively. The biosorption of metal ions from the synthetic wastewaters was also investigated in the systems. TS-I has a very high biosorption capacity for metal ions due to the chelating effects of thiosalicylic acid in metal complexes and, it is an effective and eco-friendly biosorbent for the biosorption of metal ions from aqueous solutions.
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