HEAVY METALS ADSORPTION BY XANTHATE OF FOOD PROCESSING WASTE
Abstract: Industrial effluent
loaded with heavy metals are a cause of hazard to human and other forms of
life. Conventional methods such as precipitation, evaporation, electroplating,
ion exchange, membrane process
used for removal
of heavy metals
from waste water however, are
often cost prohibitive
having inadequate efficiencies
at low metal
ion concentrations. Adsorption technology has become one of the
alternative treatments. It is observed that appropriated modification of the
raw adsorbents especially xanthates can eliminate the
drawbacks of adsorbent
and improve their
performances significantly. Xanthates
are most prominent because they are highly insoluble, easy to prepare with relatively inexpensive
reagents and have
high stability constant
values of the
metal complexes formed. Xanthates
are formed by
reacting an organic
hydroxyl containing substrate with
carbon disulfide under
caustic condition. One of organic
hydroxyl-containing substrate that can be used for xanthation is food
processing waste. The major factors affect the biosorption process are: contact
time, initial metal ion concentration, temperature, pH & biomass
concentration in solution.
It is postulated
that metal ion adsorption process could undergo a
complex formation. Most of heavy metal adsorption into the
xanthate compound followed
Langmuir adsorption isotherm
model, and well described by the pseudo-second- order
equation.
Key-word: Adsorption,
Xanthate, Heavy metal
Author: Indah Hartati, Indah
Riwayati
Journal Code: jptlisetrogg110004
