Chemistry Journal of Moldova

Ecological chemistry

PLASMA-CHEMICAL SYNTHESIS OF SILVER NANOPARTICLES IN THE PRESENCE OF CITRATE

Author(s):

Margarita Skіba, Alexander Pivovarov, Anna Makarova, Victoria Vorobyova


Field: Ecological chemistry
Type: Research paper
Issue: 2018 Volume 13, no.1
Pages: 7-14
Keywords: nanoparticle, silver, stabilization, plasma, antibacterial.
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DOI: http://dx.doi.org/10.19261/cjm.2018.475   
 
Abstract (PDF)
Graphical Abstract: The contact non-equilibrium low-temperature plasma technique is used to synthesize silver nanoparticles (AgNPs) employing trisodium citrate as capping agent. The AgNPs were characterized using UV-Vis spectroscopy, scanning electron microscopy, X-ray diffraction and zeta potential analysis. Additionally, the antibacterial properties of the synthesized AgNPs were assessed. 


 

Downloads: 49

IMPROVEMENT OF FILTRATION PROPERTIES OF GHIDIRIM DIATOMITE (REPUBLIC OF MOLDOVA)

Author(s):

Larisa Postolachi, Vasile Rusu, Tudor Lupascu, Oleg Petuhov


Field: Ecological chemistry
Type: Short communication
Issue: 2018 Volume 13, no.1
Pages: 117-121
Keywords: diatomite, alkaline treatment, filtration rate.
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DOI: http://dx.doi.org/10.19261/cjm.2018.436

Abstract (PDF) 
Graphical Abstract: The aim of the study was to modify the diatomite from Ghidirim village (Ribnita distinct, Republic of Moldova) with purpose to use it as filter material. The initial diatomite was modified by alkaline treatment with sodium carbonate, and the filtering capacity was evaluated by suction filtration method. The treatment of diatomite by sodium carbonate resulted in an increased filtration rate, recording the most pronounced filtering capacity for diatomite treated with 20% solution of sodium carbonate.


 

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ADSORPTION OF CADMIUM IONS FROM WATER ON DOUBLE-WALLED CARBON NANOTUBES/IRON OXIDE COMPOSITE

Author(s):

Karima Seffah, Amel Zafour-Hadj-Ziane, Abdelghani Tarek Achour, Jean-François Guillet, Pierre Lonchambon, Emmanuel Flahaut


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.2
Pages: 71-78
Keywords: double-walled carbon nanotubes, iron oxide, adsorption, cadmium ions.
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DOI: http://dx.doi.org/10.19261/cjm.2017.412   

Abstract (PDF)
Graphical Abstract: A new material (DWCNT/iron oxide) for heavy metals removal was developed by combining the adsorption features of double-walled carbon nanotubes with the magnetic properties of iron oxides. Batch experiments were applied in order to evaluate adsorption capacity of the DWCNT/iron oxide composite for cadmium ions. The influence of operating parameters such as pH value, amount of adsorbent, initial adsorbate concentration and agitation speed was studied. The adsorption capacity of the DWCNT/iron oxide adsorbent for Cd2+ ions was 20.8 mg g-1, which is at the state of the art. The obtained results revealed that DWCNT/iron oxide composite is a very promising adsorbent for removal of Cd2+ ions from water under natural conditions. The advantage of the magnetic composite is that it can be used as adsorbent for contaminants in water and can be subsequently controlled and removed from the medium by a simple magnetic process.


 

Downloads: 54

THE IMPACT OF THE TREATMENT WITH CÂMPENI RED PETROLEUM ON A XVIII-TH CENTURY ICON

Author(s):

Cosmin-Tudor Iurcovschi, Marius Munteanu, Cristiana Manea (Amariei), Maria Modesta Lupașcu, Irina Crina Anca Sandu, Viorica Vasilache, Ion Sandu


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 53-60
Keywords: old icon, conservation state, preservation, restoration.
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DOI: dx.doi.org/10.19261/cjm.2017.406
 
Abstract (PDF)
Graphical Abstract:
This paper presents the study regarding the impact of the treatment with Câmpeni red petroleum on an eighteenth-century icon made of wood, with the aim of active preservation and restoration. In accomplishing this endeavour, there were applied non-invasive techniques of analysis based on optical microscopy (OM), Scanning Electron Microscopy (SEM) coupled with Energy Dispersive X-ray analysis (EDX), micro-FTIR and colorimetry CIEL*a*b*. A series of chemical, physical-structural and mechanical characteristics of the wood were traced, in order to assess the degree of preservation enhancement as a result of the applied treatment.

Downloads: 109

NEW COMPOSITE SORBENTS FOR CAESIUM AND STRONTIUM IONS SORPTION

Author(s):

Mykola Kartel, Vita Galysh


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 37-44
Keywords: lignocellulose-inorganic sorbent, caesium ion, strontium ion, sorption efficiency, distribution coefficient.
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DOI: dx.doi.org/10.19261/cjm.2017.401
 
Abstract (PDF)
Graphical Abstract: 
Composite lignocellulose-inorganic sorbents derived from plant residues of agriculture and food industry, modified with ferrocyanides of d-metals and hydrated antimony pentoxide were prepared. Caesium and strontium ions removal from water was tested by radiotracer method. Sorption of heavy metal ions, methylene blue, gelatin, vitamin B12 was also studied.

Downloads: 91

REMOVAL EFFICIENCY OF CONSTRUCTED WETLAND FOR TREATMENT OF AGRICULTURAL WASTEWATERS

Author(s):

Michal Šereš, Tereza Hnátková, Jan Vymazal, Tomáš Vaněk


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 45-52
Keywords: constructed wetland, agriculture wastewater, hybrid systems, horizontal filter, vertical filter.
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DOI: dx.doi.org/10.19261/cjm.2017.403   
 
Abstract (PDF)
Graphical Abstract: 
This study describes performance of a hybrid constructed wetland (CW) for treating wastewater from small farm in Czech Republic. TheCW consisting of two horizontal filters, one vertical filter and three shallow pondsand reduced inflow values of 25.400 mg/L COD and 2.640 mg/L BOD5 by up to 99%.

Downloads: 64

EFFECT OF COPPER CONCENTRATION ON THE GROWTH OF METHYLOCOCCUS CAPSULATUS (STRAIN М)

Author(s):

Lidia Avdeeva, Rudolf Gvozdev


Field: Ecological chemistry
Type: Short communication
Issue: 2017 Volume 12, no.1
Pages: 110-114
Keywords: copper, biosorption, Methylococcus capsulatus, methanobactin.
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DOI: dx.doi.org/10.19261/cjm.2017.404  
 
Abstract (PDF)
Graphical Abstract: Growth of Methylococcus capsulatus (M) under different copper content in the growth medium has been studied. Excess of copper is sorbed in cytoplasm and on the cell surface. Growth of M. capsulatus (М) under copper-limited and copper-excess growth conditions is accompanied by increase of methanobactin secretion into the growth medium.

Downloads: 46

PROCESSES UNDERLINING THE ACTION OF PESTICIDES ON ECOSYSTEMS AND HUMAN ORGANISM

Author(s):

Elena Saratovskikh


Field: Ecological chemistry
Type: Review
Issue: 2017 Volume 12, no.1
Pages: 20-28
Keywords: pesticides, adenosine triphosphate, NADH-oxidoreductase, nucleotides.
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DOI: dx.doi.org/10.19261/cjm.2017.393
 
Abstract (PDF)
Graphical Abstract:
 This article is devoted to the study of the mechanism of action of pesticides as compounds with a high complexing capacity for metals, nucleotides and enzymes. The sum of these effects is the cause of almost all diseases of modern man, and including - cancer. It is very necessary to ban the use of pesticides to save our world, ecosystems and human and the population health improvement.

Downloads: 47

ACUTE CHEMICAL POISONINGS IN THE REPUBLIC OF MOLDOVA: 5 YEARS REVIEW

Author(s):

Iurie Pinzaru, Tatiana Manceva, Raisa Sircu, Ion Bahnarel, Elena Sanduleac


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 29-36
Keywords: acute chemical poisonings, chemical substances type, poisoning incidence.
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DOI:
dx.doi.org/10.19261/cjm.2017.399 
 
Abstract (PDF)
Graphical Abstract: 
The incidence and the type of acute chemical poisoning in Republic of Moldova during 2011-2015 were assessed. Records show 22458 cases of poisonings, including 919 death cases. The analysis of poisoning cases involving various types of chemical substances causing the intoxication reveals that the medicines-related poisoning accounts for the highest record of cases (6971), followed by alcohol poisoning, 6556 cases, gas poisoning is the third, with 1860 cases, and pesticide-related poisoning, with 707 cases. Age and gender characteristics of chemical poisonings and ways of exposure to chemicals are discussed.


 

Downloads: 31

ADSORPTION OF STRONTIUM IONS FROM WATER ON MODIFIED ACTIVATED CARBONS

Author(s):

Mihai Ciobanu, Victor Botan, Tudor Lupascu, Tatiana Mitina, Maria Rusu


Field: Ecological chemistry
Type: Research paper
Issue: 2016 Volume 11, no.2
Pages: 26-33
Keywords: adsorption, strontium ions, modified activated carbon.
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DOI:
dx.doi.org/10.19261/cjm.2016.11(2).01
 
Abstract (PDF)
Graphical Abstract: Adsorption of strontium ions from aqueous solutions on active carbons CAN-7 and oxidized CAN-8 has been studied. Obtained results showed that the adsorption isotherms for strontium ions from aqueous solutions are well described by the Langmuir and Dubinin-Radushkevich equations, respectively. The surface heterogeneity of activated carbons CAN-7 and oxidized CAN-8 has been assessed by using Freundlich equation.

Downloads: 73