http://repository.enu.kz/handle/enu/33155 2026-11-03T12:56:21Z 2026-11-03T12:56:21Z Zhenisova, D. Allambergenova, G. Baikenov, Y. Safarov, R. http://repository.enu.kz/handle/enu/33158 2026-11-03T11:55:28Z 2026-06-30T00:00:00Z

Application of Fenton-like systems for wastewater detoxification Zhenisova, D.; Allambergenova, G.; Baikenov, Y.; Safarov, R. Industrialization has led to severe environmental challenges, primarily the contamination of water bodies with persistent organic pollutants (POPs) such as pharmaceuticals, synthetic dyes, and toxic organic compounds. Conventional treatment methods, including biological processes and coagulation, often prove insufficient for the complete degradation of these chemically stable substances. This review systematically examines the application of Fenton-like systems as a promising advanced oxidation process (AOP) for industrial wastewater detoxification. Specifically, the review aims to compare degradation efficiencies across three priority pollutant classes—toxic organic compounds, synthetic dyes, and pharmaceutical residues - identify the catalytic and operational factors governing process performance, and evaluate techno-economic constraints relevant to industrial scaling. The operational principles and catalytic cycles involving reactive hydroxyl radicals (•OH) are detailed, highlighting the transition from classical homogeneous reactions to more versatile heterogeneous systems. Recent advances demonstrate that utilizing transition metals (Cu, Mn, Ni) and novel materials like metal-organic frameworks (MOFs) and bimetallic oxides allows these processes to operate effectively at near-neutral pH, overcoming the strict acidic limitations of traditional Fenton chemistry. Furthermore, the integration of physical stimuli - such as ultraviolet radiation (photo-Fenton), electricity (electro-Fenton), and ultrasound (sono-Fenton) - is shown to significantly enhance radical generation and mineralization rates for complex molecules. The review provides a comparative analysis of treatment efficiencies, achieving removal rates often exceeding 95% for various toxic groups. Finally, technical and economic constraints, including sludge formation and energy intensity, are discussed alongside prospects for scaling these technologies for sustainable industrial application.

2026-06-30T00:00:00Z Yelshibayeva, A. Zhumagaliyeva, ZH. Kaldybayeva, A. Mukusheva, G. Ticar, B. Jalmakhanbetova, R. http://repository.enu.kz/handle/enu/33157 2026-11-03T11:49:15Z 2026-06-30T00:00:00Z

Comprehensive Study of Achillea millefolium L. Roots Using IR Spectroscopy, GC–MS, and Biological Tests Yelshibayeva, A.; Zhumagaliyeva, ZH.; Kaldybayeva, A.; Mukusheva, G.; Ticar, B.; Jalmakhanbetova, R. This paper presents a comprehensive study of the underground organs of Achillea millefolium L. using gas chromatography–mass spectrometry (GC–MS), infrared (IR) spectroscopy, and biological tests. The GC–MS results show that the chemical composition of the ethanol extract includes aliphatic acids and their esters, phenolic compounds, flavonoids, and carbohydrates. The main components are 1,3-dihydroxyacetone, octanoic acid, ethyl ester of hexadecanoic acid, eupatilin, and jaceosidin. The IR spectra confirm the presence of aliphatic, carbonyl, and phenolic functional groups characteristic of lipophilic and polar metabolites. The extract exhibited moderate antimicrobial activity against Staphylococcus aureus and Bacillus subtilis, which is associated with the presence of phenolic and flavonoid compounds, as well as moderate cytotoxicity in the Artemia salina test (LD₅₀ ≈ 82 μg/mL). The results indicate that the underground organs of A. millefolium accumulate lipophilic and phenolic metabolites that determine the antimicrobial and cytotoxic activities of the plant. These findings expand our understanding of the metabolism of common yarrow and confirm the potential of its roots as a source of natural biologically active substances.

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