Comment on 'biosorption of cadmium using the fungus Aspergillus niger.' by Barros, L.M., Macedo, G.R., Duarte, M.M.L., Silva, E.P. and Lobato, A.K.C.L

Biosorption of cadmium was investigated using the Aspergillus niger fungus. A pseudo-second order kinetic expression for the adsorption systems of divalent metal ions was developed using sphagnum moss peat. The pseudo-second order rate expression was also applied to the sorption of metal ions, dyes, and organic substances from aqueous solutions. The reaction order of the such as a comparison of chemisorption kinetic models and pseudo-second order models was also discussed.