BIOSORPTION OF PB (II) AND CD (II) BY HALOMONAS SP.NADINE ZMORROD1, NAWAL AL HAKAWATI1, RANYA A. AMER2 AND HODA H. YUSEFAbstract In this study, the biosorption ability of the halophilic bacterial isolate H1S2 biomass was investigated for Pb (II) and Cd (II) removal from aqueous solution. The bacterial isolateH1S2 was identified using the 16S rRNA gene sequence analysis as Halomonas meridiana H2. The parameters influencing the biosorption process were optimized such as initial metal concentration, biomass dose and contact time. The optimum dried biomass dose of H. meridiana H2 for Pb (II) and Cd (II) metal ions removal was 50 mg. The optimal contact time for the removal of Pb (II) and Cd (II) metal ions by H. meridiana H2 was 10 and 15 minutes respectively. The Langmuir, Freundlich and DubninâRedushkevich isotherm models were applied. The equilibrium data obtained from the experiments fitted well with the Langmuir and Freundlich isotherms. The kinetic data was also studied and found to be following pseudo-second order model. |