Salt Tolerance in Five Species of Azolla by Studying Various Biochemical Parameters

Abstract

Jatropha biomass was immobilized in sodium alginate gel beads. The immobilized beads were used for the biosorption of Cu2+ and Cr6+ ions from aqueous solution by us in~ batch and continuous methods. The standard calibration curve for the absorbance of Cu + ions in batch method was observed at I 00 ppm salt concentration. It was observed that as the concentration of ions increases the absorbance value decreases. The maximum absorbance of Cu2+ ions at pH of 6.5 was observed and for the contact time of 15 minutes. Similar results were obtained for the absorption of Cr6+.The maximum absorbance of Cr6+ was observed at I 00 ppm. For batch method maximum absorbance of Cr6+ ions was observed at pH 3.5 and for the contact time of 15 minutes. In continuous method the maximum absorbance of Cr6+ions was observed at a flow rate of 1.5 mL/min and at a pH of 6.5 and at a concentration of 50 ppm. As the flow rate increases the absorbance value decreases. The Langmuir isotherm plotted followed the pseudo-first order kinetics. Column is more efficient in Cu2+ and Cr6+ removal over batch method. Immobilization enhanced the sorption of Cu2+ and Cr6+ ions and the beads could be repetitively regenerated by washing with a solution ofO.IN HCI without significant loss of its initial biosorption capacity