Sorption activity of zoocompost relative to copper ions Cu(II)
Abstract
The study explored the possibility of using zoocompost, a waste product obtained during the production of protein and lipid concentrate from the larvae of the black soldier fly (Hermetia illucens), to reduce the mobility of copper (II) ions in soils due to the sorption of copper (II) ions. The Hermetia zoocompost, which has high air permeability, moisture-retaining properties, and a porous structure was used in the study.
The adsorption of Cu2+ ions was studied under static conditions using model copper containing solutions prepared by dissolving CuSO4·5H2O salt in distilled water. It has been established that the sorption capacity of Cu2+ ions by zoocompost was 1 mmol/g or 64 mg/g. The efficiency of purification of a model solution containing Cu2+ ions reached 95% of the initial concentration. The mathematical processing of the adsorption isotherm within the framework of the Brunauer-Emmett-Teller (BET), Temkin, Langmuir, Dubinin-Radushkevich, and Freundlich models showed that the adsorption process was most accurately described by the Freundlich model (R2=0.9686). The value of Gibbs energy (ΔGо=-15.18 kJ/mol) indicated a spontaneous process. The calculated sorption energy (E=15.022 kJ/mol) indicated the specific nature of adsorption.
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