Imangalieva А.N., Ishanova М.N., Seilkhanova G.А. Composite materials based on the thistle meal for the treatment of aqueous solution from Pb2 + and Cd2+ ions

Kazakh National University named after al-Farabi, Kazakhstan, Almaty

Abstract

This paper presents the results of research of texture and sorption characteristics of composite materials based on vegetable raw materials walnut shell and thistle meal, activated with alkali and ammonia.
It is shown that practically all the texture and adsorption characteristics as a result of the modification
have significantly improved. Based on the analysis of the results of scanning electron microscopy (SEM)
and increased values of adsorption activity of iodine, the modified material has a practically heterogeneous texture, represented mainly by mesopores was established. It was established that the process of
sorption of cadmium and lead ions is described by the monomolecular theory of Langmuir, which is
characterized by the presence of active centers on the surface of the sorbent. The optimal conditions
for the sorption of Cd2+ and Pb2 + ions under static conditions are established: the contact time of the
reagents is 15 min, at which the degree of extraction of cadmium and lead ions reaches ~ 99.0%. In
addition, the sorption process was studied in the simultaneous presence of two ions: Cd2+ and Pb2 +.
The sorbent obtained from the plant raw materials can be used for effective wastewater treatment from
cadmium and lead ions, which contributes to solving one of the most urgent problems in the field of
ecology and environmental protection.
Key words: thistle meal, walnut shell, lead, cadmium, sorption, composite materials