Characterization of Thermostructural Damages Observed in a Seaweed Used for Biosorption of Cadmium:Effects on the Kinetics and Uptake

摘要

The effect of drying Sargassum filipendula on the kinetics and uptake of cadmium was studied. The maximum uptake was not reduced when oven-dried biomass was used for cadmium concentrations from 10.0 to 500.0 mg/L. Kinetics indicated better performance of the in natura biomass. Drying at 333 K affected the uptake capacity. Results fit the Langmuir model better than the Freundlich. This process followed pseudo-second-order kinetics. Thermogravimetric and infrared analysis confirmed that no structural damage occurred after drying, and no differences between the biomasses were observed. Temperatures from 303 to 328 K affected cadmium uptake capacity.