Extraction of copper and zinc ions from wastewater by a sorbent based on chitosan
E.A. Tatarintseva, O.A. Arefieva, L.N. Olshanskaya, A.A. Petrov, F. Bugerara
Section: Ecologization of industry
The aim of this work was to obtain sorption magnetic materials based on ferritized galvanic sludge, thermally expanded graphene oxide, and chitosan for the removal of heavy metal ions (Cu2+, Zn2+) from aqueous media. Thermally expanded graphene oxide was obtained by electrochemical oxidation of graphite followed by hydrolysis and heat treatment at 900 оС. Ferritized iron-containing galvanic sludge was obtained by deposition by successive acid-base treatment from an aqueous suspension of galvanic sludge followed by heat treatment at 900 оС for 1.5 h. Methods for forming a magnetic composite sorbent by introducing ferritized galvanic sludge simultaneously with thermally expanded graphene oxide are considered. The resulting sorbent has the form of grains with a particle size of 2–3 mm, which have magnetic properties (≈ 0.02 T). The composition of the resulting sorption material is characterized using the IR spectroscopy method. Functional groups (primary amino and hydroxyl groups), that are capable of coordinating with various metal ions or participating in ion exchange have been determined. Studies of sorption with respect to zinc and copper(II) ions were carried out under static conditions during their extraction from model wastewater solutions. The maximum sorption capacity of the sorbent for Cu2+ ions was 6.9±0.1 mmol/g, for Zn2+ ions – 2.6±0.01 mmol/g. Sorption isotherms of Cu2+ and Zn2+ ions by the developed sorption material belong to type I according to the IUPAC classification, which is compiled on the basis of the classical classification of adsorption–desorption isotherms of Brunauer, Deming, Deming and Teller (BDDT classification), this type is typical for adsorption with the formation of a monolayer on a porous solid body.
Keywords: sorbents, water treatment, heavy metal ions, graphene oxide, magnetosorbents, industrial waste
Article published in number 1 for 2023 DOI: 10.25750/1995-4301-2023-1-148-153
ISSN 1995-4301
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