Аннотация:The effect of different concentrations of monosilicic acid on the sorption capacity of quartz sand,
diatomite, zeolite, and brown coal with respect to cadmium and arsenic has been studied in laboratory conditions.
The applicability of different adsorption models, including exponential, semilogarithmic, and linear
dependences, as well as the Langmuir and Freundlich equations, has been compared. An increase in monosilicic
acid concentration from 0 to 2 mM and solution pH increased the sorption capacity of all materials.
It has been suggested that either the interaction of monosilicic acid with a pollutant takes place directly in the
solution followed by sorption of the reaction products on the surface or in the pores of the sorbent, or first
adsorption of the monosilicic acid by the sorbent occurs followed by interaction of the sorbed silicic acid with
cadmium and arsenic; it is also possible that both process proceed in parallel.
Keywords: sorption ability of materials, cadmium, arsenic, monosilicic acid, environmental protection technologies