Abstract:
As a rule, ions of some heavy metals are always found in natural and waste waters. The
purpose of this work was to study the sorption properties of carbon material obtained from
secondary raw materials (hazelnut and walnut shells) according to the technology we have
developed; determination of its applicability in the purification of drinking and waste
water, in which ions of several heavy metals are simultaneously present. The salts of lead,
cobalt, iron and cadmium, as the most important pollutants of the water basin, were the
adsorbates. Studies of solutions of various concentrations of metal ions showed that in the
presence of all four ions, the maximum adsorption rate and the degree of extraction are
achieved at a solution concentration of 0.0025 M Me+2 in 30 minutes, as for the effect of
pH on the degree of sorption, the experimental results showed that the best values are
achieved at pH 3 for cobalt ions and pH 3 ÷ 5 for copper, lead and iron ions. It was found
that the nature of sorption by these absorbers is the same: for a given metal, hydrated ions
are adsorbed in the same way on different absorbers. The larger the crystal radius of an
ion with the same charge, the better it is adsorbed (sorption capacity for Pb++ ions is
maximum, and minimum for Co++ ions).