Adsorption studies of hexavalent chromium ions on the dead biomass of Cystoseira indica

The biosorption of hexavalent chromium ions from aqueous solution was investigated using acid-modified dead biomass the abundantly available brown marine alga Cystoseira indica Karachi coastal area Pakistan. biosorbent characterized by infrared spectroscopy and scanning electron microscopy. optimum conditions, i.e., dosage, contact time, initial metal ion concentration, pH, temperature, were determined carrying out batch-mode experiments. sorption behavior established Langmuir Freundlich isotherms, which showed that although uptake metals more feasible on a heterogeneous surface, homogeneous surface conditions seemed to exist at same time. thermodynamic parameters ∆G°, ∆H° ∆S° calculated different temperatures ranging 298 318 K demonstrated spontaneous exothermic process under experimental applied.