Conclusions
Sorption experiments for cadmium removal using the two
brown macroalgae L. nigrescens and D. antarctica have been carried
out. The results showed that D. antarctica is a better biosorbent
than L. nigrescens when treating wastewater contaminated with
cadmium due to the faster sorption rate. The sorption kinetics for
D. antarctica followed a pseudo second order model, whereas the
L. nigrescens sorption could better be described by first order kinetics.
En general it could be concluded that the Langmuir adsorption model was adequate for modeling the sorption isotherms for both
seaweeds studied.