Nickel, copper and zinc ions uptake

Nickel, copper and zinc ions uptake from water
solution onto modified clay sorbents has been studied
for a three single component and one ternary
system. Acid–alkaline treatment of clay changed its
chemical composition and mineralogical structure,
enhancing the metal uptake capacity of produced
sorbent with respect to the starting material. The
modification of natural clay by the method employed
led to an increase of iron, aluminium and magnesium
amount in produced sorbent as well as the decomposition
of montmorillonite structure. Batch and column
mode metal uptake, using produced sorbent
enabled under relevant conditions the removal of
nickel, copper and zinc ions till the permissible
sewerage discharge concentration. Sorption process
on a produced sorbent obeyed a Langmuir-type
isotherm. The desorption rate of nickel, copper and
zinc with acidic water ŽpH 5. was negligible