BIOSORPTION DU CESIUM EN SOLUTION AQUEUSE PAR UNE ALGUE MARINE INVASIVE : CAULERPA RACEMOSA

Abstract

Marine ecosystems have a high biological diversity with a large part of algal spices. These aquatic plants  are exploited in this study to decontaminate aqueous solutions artificially contaminated by stable cesium (133Cs). From batch experiments, preliminary tests on a dozen marine algae were carried out. Caulerpa  racemosa was the most effective biosorbent with an uptake percentage of  77.49%. The biosorption characteristics of cesium Cs+ using Caulerpa racemosa biomass were studied under the influence of  various parameters such as: pH of the solution, contact time and initial of Cs+ concentration. The  optimum pH value is found in the range between 4 and 7. The kinetic shows that equilibrium is reached after 20 minutes. The pseudo-second-order model describes well the kinetics biosorption data. The  biosoprition isotherm data were in agreement with Langmuir isotherm model where the chemical biosorption process occurring in monolayer is the main assumptions. The maximum biosorption capacity  recorded by Langmuir isotherm model is 10.39 mg/g .