DEVELOPMENT OF POLYADSORBENTS BASED ON POLYETHYLENIMINE AND LOW MOLECULAR WEIGHT LIGANDS FOR THE EXTRACTION OF GROUP II METAL IONS FROM WASTEWATER
Ashimkhan N. Murzagaliyeva M. Daribayeva G. Sapiyeva A.
2025Technology Center
Eastern-European Journal of Enterprise Technologies
2025#4Issue 10(136)37 - 46 pp.
The object of this study is the physicochemical processes of interaction between Group II metal ions and polyethyleneimine (PEI) and low-molecular-weight ligands (salicylic acid, sulfosalicylic acid, EDTA) with the aim of developing polyadsorbents for the selective extraction of toxic ions from aqueous media. The problem to be solved is the development of effective and selective polyadsorbents for removing toxic metal ions from wastewater. Potentiometric, conductometric, and viscometric analysis methods have established that in binary PEI-M2+ systems, coordination complexes are formed with a molar ratio of PEI:M2+ = 2:1. For systems with Sr2+ and Ba2+ ions, stepwise complexation was identified, with particles of composition 6:1 and 4:1 being formed at the initial stage, respectively. The stability of the complexes formed was established in the following order: Be2+ > Ca2+ > Sr2+ > Ba2+ > Mg2+. Thermodynamic parameters showed that the complexation processes are spontaneous and exothermic, with the decrease in entropy being associated with an increase in order within the system. Stability constants (lgβ0) range from 5.4 (Mg2+) to 10.16 (Be2+). Quantum chemical calculations have shown that the reaction centers in the ligand molecules are: the oxygenatomsof thecarbonylgroup (H2Sal), thesulfonate group (H3Ssal), and the carboxyl group (H2edta2-). It has been established that donor-acceptor interactions predominate in PEI-M2+-H2Sal/H3Ssal ternary systems, while electrostatic interactions dominate in PEI-Zn2+/Cd2+-H2Sal and PEI-Be2+-H2edta2- systems. In sorption tests in model solutions, the ternary complexes PEI-Be2+-H3Ssal and PEI-Hg2+-H3Ssal demonstrated the highest efficiency: the degree of removal of Be2+ reached 97.1%, Hg2+ – 93.4%, while for Mg2+ and Ba2+ it was less than 70%. Modified PEI with H3sal proved to be the most effective adsorbent among those studied. In industrial trials, the developed adsorbents reduced the concentrations of Be2+ and Hg2+ in wastewater to 0.004 and 0.002 mg/l, respectively, which meets the maximum permissible concentrations for discharge into water bodies Copyright
adsorption , complexation , ion , ligand , metal , polyethyleneimine , thermodynamics , titration , wastewater
Text of the article Перейти на текст статьи
Department of Chemistry, Kazakh National Medical University, named after S. D. Asfendiyarov Tole Bi str., 94, Almaty, 050000, Kazakhstan
Research Institute of Food Safety, Almaty Technological University, Raiymbek ave., 348/5, Almaty, 050061, Kazakhstan
Department of General and Biological Chemistry Astana Medical University, Beybitshilik str., 49a, Astana, 010000, Kazakhstan
Department of Chemistry
Research Institute of Food Safety
Department of General and Biological Chemistry Astana Medical University
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026