Ecological chemistry

DYNAMICS OF THE SELF-PURIFICATION PROCESSES IN THE WATERS OF THE DNIESTER RIVER DURING THE YEARS 2015-2024 (DUBASARI – VADUL LUI VODA SECTION)

Author(s):

Maxim Cisteacov, Gheorghe Duca, Vladislav Blonschi, Viorica Gladchi, Angela Lis, Elena Bunduchi

Field: Ecological chemistry
Type: Research paper
Issue: 2025 Volume 20, no.1
Pages: 17-27

Keywords: Dniester river, surface water, biochemical oxygen demand, thiol, self-purification process.
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https://doi.org/10.19261/cjm.2025.1318

Abstract (PDF)

Graphycal Abstract: The study represents an analysis of the dynamics of self-purification processes in the Dniester River waters over ten years, conducted based on five hydrochemical and kinetic parameters. The study results demonstrated that the Dniester River waters are also loaded with reducing compounds, especially from the Răut and Ichel tributaries, which diminishes the intensity of the self-purification processes. However, after the last sampling point, a slight trend toward restoring initial properties was observed.

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STUDY OF THE EFFICIENCY OF APPLICATION OF SCALE INHIBITORS FOR WATER

Author(s):

Inna Trus, Vita Halysh, Mariia Tverdokhlib, Olena Makarenko, Evhen Chuprinov, Vadim Fedin

Field: Ecological chemistry
Type: Research paper
Issue: 2025 Volume 20, no.1
Pages: 28-37

Keywords: antiscalant, water, scaling, hardness ion.
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https://doi.org/10.19261/cjm.2025.1256

Abstract (PDF)

Graphycal Abstract: A promising method of water conditioning for water circulation systems with the use of a scale stabiliser was considered. To inhibit the scale formation, antiscalant RT-2024-4 was used and the ability to mitigate the scale formation was tested. Water of various origins with different hardness was used during experiments.

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USING OF WASTE SORBENT FROM FOOD INDUSTRY FOR THE REMOVAL OF COPPER IONS FROM WATER

Author(s):

Olha Khudoiarova, Oleg Blazhko, Alina Blazhko

Field: Ecological chemistry
Type: Short communication
Issue: 2025 Volume 20, no.1
Pages: 95-99

Keywords: spent sorbent, reuse, regeneration, modification, copper(II) ion, removal, adsorption.
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https://doi.org/10.19261/cjm.2025.1250

Abstract (PDF)

Graphycal Abstract: The effectiveness and prospects of using food industry waste sorbents for water purification from copper (II) ions have been studied. The use of a regenerated sorbent made of activated carbon and kieselguhr modified with sulphide and hydrosulphide ions increases the efficiency of removing copper (II) cations from water by 65.5 times It was established that topochemical reactions occur on the surface of the modified sorbent with the formation of copper (II) sulphide CuS and elemental sulfur. The possibility of topochemical transformations was established by IR-spectral and X-ray phase studies.

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ASSESSING THE CHEMICAL COMPOSITION OF NATURAL WATER USING ANALYTICAL CHEMISTRY TECHNIQUES. A CASE STUDY IN THE ORHEI DISTRICT, REPUBLIC OF MOLDOVA

Author(s):

Victor Ciornea, Silvia Eftodi, Corneliu Cojocaru, Elena Zubcov

Field: Ecological chemistry
Type: Research paper
Issue: 2024 Volume 19, no.2
Pages: 101-112

Keywords: chemical composition of water, physico-chemical investigation, ICP-OES, heavy metal.
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https://doi.org/10.19261/cjm.2024.1237

Abstract (PDF)

Supplementary Material (PDF)

Graphycal Abstract: This study assessed water quality in Cișmea, Orhei district (coordinates 47°24’56.0"N 28°45’05.9"E). Surface and underground water were analyzed for pH, conductivity, hardness, chloride, sulfate, and chemical elements. The concentration values of the 36 elements determined by the ICP-OES method are presented. Conductivity and sulfate deviations indicated high dissolved solids. Results revealed significant deviations from permissible levels: As (1.7-1.9x), Cd (3.4-3.5x), Pb (1.2-2.3x), Na (1.2-4.0x), and B (1.6-3.3x). Notably, Ba, Tl, and Bi concentrations were also detected.

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THE POTENTIAL OF RICE HUSK WASTE TO SYNTHESISE ZINC OXIDE NANOPARTICLES AND ASSESSMENT TO THE ANTIBACTERIAL ACTIVITIES

Author(s):

Nurfitrah Amran, Siti NurSyazwani Maadon, Yamin Yasin, Nik Rozlin Nik Masdek, Mohd Rafii Yusop, Nor Hazlina Mat Sa’at, Nor Monica Ahmad, Nor’Aishah Hasan

Field: Ecological chemistry
Type: Research paper
Issue: 2024 Volume 19, no.2
Pages: 7-15

Keywords: rice husk waste, Oryza sativa, zinc oxide, nanoparticle, antibacterial activity.
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https://doi.org/10.19261/cjm.2024.1196

Abstract (PDF)

Supplementary Material (PDF)
Graphycal Abstract: The present work explored the synthesis of ZnO nanoparticles using rice husk waste. The characterisation by UV-Vis spectroscopy suggested the formation of ZnO.
Analysis of X-Ray diffraction analysis (XRD) confirms the purity of the NPs with a crystallite size of less than 21 nm.Fourier transform infrared spectroscopy reveals the significance functional group at 487 cm^-1.

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THE EFFECT OF BIOSORBENT CONCENTRATION (CHAMOMILE TEA RESIDUES) ON LEAD REMOVAL FROM WATER SAMPLES

Author(s):

Kaltrina Jusufi, Enju Wang, Taha Fadlou Allah, Ali A. Shohatee, Sudhir Kumar Singh, Makfire Sadiku

Field: Ecological chemistry
Type: Research paper
Issue: 2024 Volume 19, no.1
Pages: 56-61

Keywords: environmental pollution, remediation, biosorption, lead, chamomile residues.
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https://doi.org/10.19261/cjm.2024.1144

Abstract (PDF)
Graphical Abstract: This study examines the potential use of a low-cost biosorbent - chamomile tea residues, as an alternative to traditional adsorbents for removing Pb²⁺ ions from aqueous solutions. The results show that lead concentration is reduced under optimized conditions, achieving an impressive nearly 50% Pb²⁺ ions removal with a mere just 0.05 g of the waste material, depicting chamomile tea residues as efficient biosorbent in lead removal.

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SILVER AND ZINC NANOPARTICLES BIOSYNTHESIS USING LAUREL EXTRACT AND INVESTIGATION OF THE PHOTOCATALYTIC PROPERTIES

Author(s):

Recep Taş, Ebru Köroğlu, Ahmet Karakuş, Ali Savaş Bülbül, Nilay Akkuş Taş

Field: Ecological chemistry
Type: Research paper
Issue: 2024 Volume 19, no.1
Pages: 47-55

Keywords: biosynthesis, silver, zinc, nanoparticle, photocatalysis.
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https://doi.org/10.19261/cjm.2024.1113

Abstract (PDF)
Graphical Abstract: This study explores the green synthesis of silver and zinc nanoparticles using Laurel extract as a reducing agent. The biosynthesized nanoparticles were characterized for size, shape, and structure. Photocatalytic activities were evaluated for potential environmental applications. Results show promising prospects for sustainable nanoparticle synthesis and efficient photocatalytic degradation.

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THE ROLE OF VARIOUS FRACTIONS OF HUMIC SUBSTANCES FROM SURFACE WATER IN BINDING Al(III), Fe(III), AND Cu(II) INTO COMPLEXES

Author(s):

Vladyslav Zhezherya, Petro Linnik, Rostyslav Linnik

Field: Ecological chemistry
Type: Research paper
Issue: 2023 Volume 18, no.2
Pages: 15-27

Keywords: water body, humic substance, metal, binding ability, molecular weight distribution.
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https://doi.org/10.19261/cjm.2023.1091

Abstract (PDF)
Supplementary Material (PDF)
Graphical Abstract: The aim of this research work was to evaluate the role of different fractions of humic substances in the binding of Al(III), Fe(III) and Cu(II) ions into complexes. The share of humic substances with a molecular weight of 20–5 kDa increases from 37% to 59%, when the total concentration of humic substances also increases. It was established that humic substances with molecular weight 20–5 kDa bounded the smallest amount of Al(III), Fe(III) and Cu(II) into complexes.

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DEGRADATION OF DIISOPROPYL METHYLPHOSPHONATE IN AQUEOUS SOLUTIONS BY ULTRASONIC IRRADIATION

Author(s):

Muslim Hasan Allawi, Riyadh Sadeq ALMukhtar, Shurooq Talib Al-Humairi, Ali Dawood Salman, Tatjána Juzsakova, Viktor Sebestyén, Igor Cretescu

Field: Ecological chemistry
Type: Research paper
Issue: 2023 Volume 18, no.2
Pages: 28-34

Keywords: ultrasound, diisopropyl methylphosphonate, sonochemical kinetic, aqueous solution, chemical oxidant.
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https://doi.org/10.19261/cjm.2023.1019

Abstract (PDF)
Graphical Abstract: The degradation of diisopropyl methylphosphonate (DIMP) in aqueous solutions was studied using ultrasound irradiation with a fixed frequency of 26.6 kHz, following the first-order kinetic model. The experimental parameters, including the pH, the initial concentration of DIMP, the processing time, and the concentration of the additive CCl₄ were investigated. The best degradation efficiency of 98% was observed at pH of 10, adding 0.8 g/L CCl₄ for a processing time of 45 min.

Downloads: 79

ANTIOXIDANT PROPERTIES OF SOME PLANT EXTRACTS AND EFFECT OF THEIR ADDITION ON THE OXIDATION STABILITY OF BIODIESEL

Author(s):

Pavlo Kuzema, Iryna Laguta, Oksana Stavinskaya, Viktor Anishchenko, Anastasiia Kramar, Natalia Smirnova, Tetiana Fesenko, Roman Ivannikov, Oksana Linnik

Field: Ecological chemistry
Type: Research paper
Issue: 2023 Volume 18, no.2
Pages: 35-44

Keywords: plant extract, phenolic compound, antioxidant, biodiesel, oxidation stability.
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https://doi.org/10.19261/cjm.2023.1100

Abstract (PDF)
Graphical Abstract: The extracts from the leaves of Deschampsia antarctica, Camelina sativa, and Camellia japonica plants, as well as from Camelina sativa and Silybum marianum seedcakes were investigated as potential additives for improvement of biodiesel stability against oxidation. In spite of significant distinctions in the content of various phenolic compounds, all the extracts were found to effectively inhibit DPPH radicals and decelerate transformation of fatty acid esters of biodiesel into organic acids by ~9-26%. Various extracts were shown to have different activity towards the biodiesel from rape and camelina seed oils; this result is consistent with the assumption that there is no universal stabilizer for different types of biodiesel.

Downloads: 122