Study of cobalt ions’ sorption from water by Lissachatina fulica shell
N.A. Voronin, V.A. Somin
Section: Population ecology
Cobalt compounds are among the most toxic pollutants of water bodies that can enter them due to discharges of insufficiently treated wastewater from engineering and chemical industries. In the environment cobalt accumulates in plant and animal tissues and can enter the human body through the trophic chain, causing toxic and mutagenic effects. In this regard, it is important to use technologies that effectively extract cobalt from water using various materials. This paper presents the results of studies on the cobalt sorption from water by the shell of the Lissachatina fulica (Férussac, 1821) mollusk. For the research, a shell with geometric dimensions from 2 to 5 mm, pre-washed and crushed on a jaw crusher, was used both in its native form and modified with a sodium hydroxide solution with a concentration of 10 % and treated with ultrasound at a frequency of 40 kHz. A static sorption capacity was determined for all materials, which was 37 mg/g for native material, 31 mg/g modified with sodium hydroxide, and 17 mg/g modified with ultrasound. Linearized isotherms of sorption of cobalt ions are constructed according to the Langmuir, Freundlich, Dubinin-Radzhdankevich, and Temkin models. The sorption equilibrium constants and the values of the limiting sorption are calculated according to these models. It is revealed that the sorption of cobalt ions is satisfactorily described by the Langmuir, Freundlich, and Temkin models for both native and modified shells and has a physical character. The Dubinin-Radostkevich model is not suitable for describing the sorption of the studied materials, since the correlation coefficient was less than 0.2. Activation with sodium hydroxide and ultrasound is impractical, since it leads to a decrease in the sorption capacity of the material by 1.2 and 2.2 times, respectively.
Keywords: adsorption, cobalt ions, shellfish, water pollution
Article published in number 2 for 2026 DOI: 10.25750/1995-4301-2026-2-210-218
ISSN 1995-4301
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