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Increasing pH from 4 to 5 lead to a decrease of adsorption capacity.
This could be attributed to the strong effect of initial concentra-tion of solute which is very high comparing with the relatively low
sorption capacity of biosorbent. Also, parallel precipitation of Cu(II)
hydroxide is possible which means that the initial concentration of
Cu(II) ion is lower than it should be. Besides, increase in density
of the negative charge on the cell surface, causing proton removal
from the solution, thereby decreasing biosorption capacity of Cu(II)
because of competitively adsorption of protons.
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