ON THE POSSIBILITY OF EFFICIENT MERCURY EXTRACTION FROM MAN-MADE MATERIALS BY CARBON SORBENTS

Abstract

One of the methods of extraction metals from waste
waters and man-made structures that provide for
the completeness of metals extraction is the sorption
method using coal sorbents.
Studies on determining optimum pH were carried
out in static conditions. The optimum pH-region for
the sorption of Hg(II) pH 3.5-4.5.was determined.
The sorption is an exothermic process, therefore
with the increase of temperature the capacity of the
sorbent for metals decreases.
Kinetic studies displayed that the sorption interaction in the metal-containing solution- carbon
sorbent is actually fairly intensely. When the initial
mercury concentration of 4-5 mg/l for mercury by
increasing the temperature from 20 to 80 0C the
time for setting sorption equilibrium is reduced
from 90 to 30 minutes.
For improving the efficiency of mercury extraction
from man-made materials, the modification of carbon sorbents by sulfonation process is performed.
The use of sorption method permits to extract heavy
metal ions from waste waters of industrial enterprises up to MPC values.