Abstract
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 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.
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Ji, X., Liu, S., Hua, P. et al. Cadmium and arsenic adsorption in aqueous systems in the presence of monosilicic acid. Moscow Univ. Soil Sci. Bull. 72, 199–206 (2017). https://doi.org/10.3103/S0147687417050040
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DOI: https://doi.org/10.3103/S0147687417050040