Abstract: Ion
exchange process between ion NH4+ and H+ by using zeolite
as its ion exchanger is one of methods
to purify water
from ammonium ion
content. Natural zeolites
are chosen as ion
exchanger because it
is abundantly provided
in Indonesia, especially
in Lampung. The influences of
reaction temperature and
stirrer speed toward
reaction rate constant,
mass transfer coefficient and effective diffusivity in batch ion
exchange process, were analysed by using
shrinking core model.
Processes run by
mixing zeolite and
ammonium solution in a stirred
tank at 30, 40 and 50oC with stirrer speed variation of 700, 800 and 900 rpm.
Every 5 up to 60 min, the sample was taken for ammonium ion analyses. The
results show that mass transfer,
intraparticle diffusion and
ion exchange reaction
resistance influenced the
overall rate of reaction. The results also show that reaction
temperature and stirrer speed influenced the reaction rate constant, mass
transfer coefficient and effective diffusivity. The correlations of them are
stated in simple empirical equation. Shrinking core model was good to describe the
ion exchange kinetics between NH4+ and H+ ion in natural
zeolite from Lampung with the average error range of 1,15 % –
3,71%.
Keywords: ion
exchange kinetics, Lampung natural zeolite, shrinking core model
Penulis: Simparmin
Br Ginting
Kode
Jurnal: jpkimiadd090027
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