Chemistry Journal of Moldova

2017 Volume 12, no.1

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: 42

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.

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SYNTHESIS OF ALIPHATIC SYMMETRIC DIPHOSPHONIUM SALTS AND BACTERICIDAL ACTIVITY OF SELECTED PRODUCTS

Author(s):

Bin Yuan, Wei Hu, Song Lv, Jieyang Huang, Kecheng Huang


Field: Organic chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 81-86
Keywords: diphosphonium salts, ω,ω´-dibromo alkane, synthesis, bactericidal activity.
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DOI: dx.doi.org/10.19261/cjm.2017.376 
 
Graphical Abstract: Eight new aliphatic symmetrical diphosphonium salts were synthesized by reacting ω,ω´-dibromoalkanes with triphenylphosphine or tributylphosphine using N,N-dimethyl acetamide as a solvent at 140~150°C for 16~20 h under a nitrogen atmosphere.

 

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ANODIC OXIDATION OF SULPHITE IN ALKALINE MEDIA ON PLATINUM NANOPARTICLES MODIFIED NICKEL ELECTRODE

Author(s):

Andreea-Floriana Enache, Mircea Laurentiu Dan, Nicolae Vaszilcsin


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 102-109
Keywords: sulphite anodic oxidation, smooth nickel, platinum nanoparticles, chrono-electrochemical methods.
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DOI: dx.doi.org/10.19261/cjm.2017.408   
 
Abstract (PDF)
Graphical Abstract:
 In this paper, anodic oxidation of sulphite ions on smooth nickel based 6 layers platinum nanoparticles electrode in aqueous alkaline solution was investigated in order to clarify the oxidation mechanism and to find optimal parameters for sulphite oxidation process, by applying various electrochemical methods of analysis.

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PREPARATION AND CHARACTERIZATION OF MICROFILTRATION CERAMIC MEMBRANES BASED ON NATURAL QUARTZ SAND

Author(s):

Andrei Ivanets, Vladimir Agabekov


Field: Industrial chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 67-73
Keywords: ceramic, membrane, microfiltration, quartz sand.
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DOI: dx.doi.org/10.19261/cjm.2017.407 
 
Abstract (PDF)
Graphical Abstract:
 The effect of phase and chemical composition of natural quartz sand, binder and burnable additives was studied. The conditions of application of the membrane and biocide layers on the formation of porous ceramic and microfiltration membranes were investigated. It is shown that a crystalline oxide of Si(IV) is determinant for obtaining the ceramic materials. The presence of carbonates (calcite, dolomite, aragonite, etc.) and crystalline aluminosilicates (microcline, albite, phlogopit, etc.) leads to a decrease in mechanical strength of ceramics. The biocide coating designed to protect the ceramic membrane surfaces from biofouling was applied and its anti-bacterial activity was shown.


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ION EXCHANGE PROPERTIES OF GEORGIAN NATURAL ZEOLITES

Author(s):

Vladimer Tsitsishvili, Nanuli Dolaberidze, Spartak Urotadze, Maia Alelishvili, Nato Mirdzveli, Manana Nijaradze


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 95-101
Keywords: ion exchange, analcime, phillipsite, scolecite
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DOI: dx.doi.org/10.19261/cjm.2017.413
 
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Graphical Abstract:
 Ion-exchange properties of natural zeolites of Georgia with a relatively low Si/Al ratio have been studied: analcimes are characterized  by selectivity series: Na+>K+>Ag+>NH4+>Ca+2>Sr+2>Li+; for phillipsites selectivity sequences are different for calcium- and potassium forms; selectivity sequence for scolecite is: Sr+2>Ba+2>Rb+>Ca+2>Cs+>K+>NH4+>Na+>Mg+2>Li+>Cd+2>Cu+2> Mn+2> Zn+2>Co+2>Ni+2.

 

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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   
 
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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%.

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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.

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A NOVEL GREEN SYNTHESIS OF NICKEL OXIDE NANOPARTICLES USING ARABIC GUM

Author(s):

Saeid Taghavi Fardood, Ali Ramazani, Sajjad Moradi


Field: Physical chemistry and chemical physics
Type: Short communication
Issue: 2017 Volume 12, no.1
Pages: 115-118
Keywords: NiO, Arabic gum, biosynthesis, sol-gel, nanoparticles.
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DOI: dx.doi.org/10.19261/cjm.2017.383  
 
Abstract (PDF)
Graphical Abstract: Present work involves synthesis of NiO nanoparticles using Arabic gum by the sol-gel method. The synthesized NiO nanoparticles were characterized by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM) and X-ray powder diffraction (XRD). It was shown that the synthesized NiO nanoparticles of cubic phase have a spherical shape and an average size of 34 nm.

 

Downloads: 54

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: 25