Abstract
Biosorption of monovalent ions Na + and K +, by deactivated protonated yeast ( Saccharomyces cerevisiae) at controlled pH, was compared with biosorption of divalent ions Ca 2+ and Mg 2+ to help to understand the underlying binding mechanisms. The adsorption for monovalent ions was accompanied by H + release. Divalent ions were sorbed by proton displacement, and also an additional mode not accompanied by release of H +. The sorption uptake of both monovalent and divalent metal ions increased with pH in the range 3–7 peaking at 6.75. Equilibrium sorption isotherms at pH=6.75 showed that the total maximum biosorptive capacity for metal ions decreased in the following order: Ca>Mg>Na⩾K.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
