Abstract:
This paper aims to study Co (II) desorption from silica gel (SG) and mercaptosilica
hybrids
(MSH)
by
many
desorbing
agents.
SG
was
prepared
from
sodium
silicate
from
rice
husk
ash,
whereas
MSH
was
SG
modified
by
organic
compounds
3-
(trimethoxysilyl)
-1propanthiol.
The characterization of adsorbents covered by an X-ray diffractometer and an
FTIR spectrophotometer. Optimization of contact time for adsorption of Co (II) on HMS and
the procedure of desorption agents (H2O, HCl, Na2EDTA.2H2O) at different contact times and
concentrations via batch methods. The results showed that the optimum contact time for Co
(II) adsorption on MSH was 120 minutes. The most appropriate desorbing agents for SG and
MSH were HCl and Na2EDTA.2H2O. The optimum contact times for Co (II) desorption on SG
and MSH were 90 and 120 minutes, respectively. The optimum concentration of HCl for
desorbing Co (II) on SG was 0.025 M. While, the optimum concentration of Na2EDTA.2H2O
for Co (II) desorption on MSH was 0.1 M
