STUDYING THE REGULARITIES OF SORPTION OF SOME METALS BY GLAUCONITE

Abstract

The imperfection of industrial wastewater treatment technologies has led to the fact that a huge amount of inorganic ecotoxicants of various salts of heavy metals gets into water bodies. The extraction of a valuable component from industrial solutions seems to be economically and environmentally justified for enterprises in Republic of Armenia. Therefore, one of the directions of greening the industrial technologies is the use of local wastewater treatment plants to remove the heavy metal ions when discharging wastewater into water bodies. Most often, for these purposes, the sorption method of purification is used using various sorbents based on a wide variety of mineral raw materials.

The search for ion exchangers of high capacity, selectivity, and low cost is of great importance, since ion exchange has taken an important place among the main methods of wastewater treatment.

It is known from literature that the natural mineral glauconite, due to its structure and physicochemical properties, has the ability to extract heavy metals from water bodies. The presence of glauconite from the Garni deposit of RA predetermines its use, and the surface modification makes it possible to use it in water treatment.

The results of kinetic studies of sorption of nickel and zinc ions under static conditions on a composite glauconite sorbent by constructing concentration isotherms are presented. The static capacities on the sorbent for zinc and nickel cations are determined.

The kinetic dependence of the adsorption of zinc and nickel cations on the studied sorbent is investigated to determine the time of arrival of the equilibrium state. The limiting stage of the sorption process is determined by establishing the mechanism of interaction of the metal cation with the active center of the adsorbent. From the data obtained, it is found that the linear dependence of At/Amax indicates that the adsorption process at this stage is limited by gel external mass transfer, and the subsequent deviation - by the enhancement of the effect of external diffusion on the adsoption rate.