Biosorption and desorption of chromium by ca-ioaded Laminaria Japonica biomass

The present study was carried out in a batch system using Ca-loaded brown algae Laminaria Japonica for its sorption and desorption capacity of chromium. The mono-component Langmuir isotherm model was used to present gathered results. Laminaria Japonica biomass reveals large suiface area and a high chromium sorption capacity - almost 48% (38.44 mg/g) of its dry weight at pH 4.5. Elution treatments such as 0.1 N HNO₃, 1 N NaOH, EDTA, Aqua Regia (3HCl+HNO₃), 0.5 M H₂SO₄ and 700degC treatment were used for the desorption performance of chromium ion sorbed. The binary form of Langmuir isotherm was used to present the results of two-metal sorption experiments. Cr ion reveals higher affinity to binding sites of biomass.