The possibilities of application of the Monte-Carlo method for simulating the consequences of pollutants emissions with specific adsorption on the underlying surface were considered. Effective methods of obtaining kinetic curves for the concentration of a pollutant for a selected square on the field and constructing contamination profiles for a specified time are analysed. The estimation of the necessary parameters of the model for obtaining high-quality kinetic curves was performed and recommendations for their optimization are given. Specific fronts for the spot propagation were obtained and visualised.
{"title":"Application of the Monte-Carlo Method to the Description of the Dynamics of the Spread of Salvo Pollution Complicated by Adsorption","authors":"S. Travin","doi":"10.19261/cjm.2021.920","DOIUrl":"https://doi.org/10.19261/cjm.2021.920","url":null,"abstract":"The possibilities of application of the Monte-Carlo method for simulating the consequences of pollutants emissions with specific adsorption on the underlying surface were considered. Effective methods of obtaining kinetic curves for the concentration of a pollutant for a selected square on the field and constructing contamination profiles for a specified time are analysed. The estimation of the necessary parameters of the model for obtaining high-quality kinetic curves was performed and recommendations for their optimization are given. Specific fronts for the spot propagation were obtained and visualised.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81823843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Abdullah, T. Juzsakova, R. Rasheed, A. D. Salman, M. Adelikhah, L. P. Cuong, I. Cretescu
This paper deals with V2O5 nanoparticles adsorbents which were obtained by thermal pretreatment carried out by increasing the temperature between 90 and 750°C. In order to obtain more detailed information on the surface chemistry of the newly prepared nanoparticles, the characterisation was done by X-ray diffraction and scanning electron microscopy, Fourier Transform infrared spectroscopy and thermogravimetric investigation technique. The prepared nanoparticles were tested for methylene blue (MB) removal from modelled water solutions. The obtained results indicated that increased MB removal efficiency (93%) and adsorption capacity (27 mg/g) after 40 minutes of adsorption were obtained for V2O5 annealed at 500°C. The applicability and suitability of the two kinetic models were tested and the removal mechanism was proposed.
{"title":"V2O5 Nanoparticles for Dyes Removal from Water","authors":"T. Abdullah, T. Juzsakova, R. Rasheed, A. D. Salman, M. Adelikhah, L. P. Cuong, I. Cretescu","doi":"10.19261/cjm.2021.911","DOIUrl":"https://doi.org/10.19261/cjm.2021.911","url":null,"abstract":"This paper deals with V2O5 nanoparticles adsorbents which were obtained by thermal pretreatment carried out by increasing the temperature between 90 and 750°C. In order to obtain more detailed information on the surface chemistry of the newly prepared nanoparticles, the characterisation was done by X-ray diffraction and scanning electron microscopy, Fourier Transform infrared spectroscopy and thermogravimetric investigation technique. The prepared nanoparticles were tested for methylene blue (MB) removal from modelled water solutions. The obtained results indicated that increased MB removal efficiency (93%) and adsorption capacity (27 mg/g) after 40 minutes of adsorption were obtained for V2O5 annealed at 500°C. The applicability and suitability of the two kinetic models were tested and the removal mechanism was proposed.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79344141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Mikhalovsky, Oleksandr Voytko, V. Demchenko, P. Demchenko
Enterosorption is a cost-effective and efficient approach to reducing the impact of chronic exposure to heavy metals and radionuclides. As an auxiliary method to medical treatment, it can protect population chronically exposed to the intake of heavy metals or radioactivity due to industrial activities or in the aftermath of technogenic or natural accidents. This paper assesses the current state of the art in the treatment of acute and chronic heavy metal poisoning.
{"title":"Enterosorption in the Treatment of Heavy Metal Poisoning","authors":"S. Mikhalovsky, Oleksandr Voytko, V. Demchenko, P. Demchenko","doi":"10.19261/cjm.2021.852","DOIUrl":"https://doi.org/10.19261/cjm.2021.852","url":null,"abstract":"Enterosorption is a cost-effective and efficient approach to reducing the impact of chronic exposure to heavy metals and radionuclides. As an auxiliary method to medical treatment, it can protect population chronically exposed to the intake of heavy metals or radioactivity due to industrial activities or in the aftermath of technogenic or natural accidents. This paper assesses the current state of the art in the treatment of acute and chronic heavy metal poisoning.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"58 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76996889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Viorina Gorinchoy, Olesea Cuzan, S. Melnic, O. Petuhov, S. Shova
Two new μ3-oxo trinuclear heterometallic Fe2IIICrIII complexes with furan-2-carboxylic and salicylic acids with the composition: [Fe2CrO(C4H3OCOO)6(CH3OH)3]NO3·0.5CH3OH and [Fe2CrO(C6H4(OH)COO)7(CH3OH)2]·2DMA were synthesized starting from iron(III) and chromium(III) salts mixture. The complexes structures were confirmed by elemental analysis, IR, Mössbauer spectroscopies, and X-ray analysis. The atomic absorption spectroscopy confirmed that the iron: chromium ratio is 2:1. The thermal properties of both heteronuclear complexes have been investigated in oxidizing and inert atmospheres revealing the stability of the trinuclear core up to 170 and 220°C, respectively.
{"title":"Synthesis and Characterisation of New {Fe2CrO} Heterotrinuclear Iron-chromium Clusters","authors":"Viorina Gorinchoy, Olesea Cuzan, S. Melnic, O. Petuhov, S. Shova","doi":"10.19261/cjm.2021.885","DOIUrl":"https://doi.org/10.19261/cjm.2021.885","url":null,"abstract":"Two new μ3-oxo trinuclear heterometallic Fe2IIICrIII complexes with furan-2-carboxylic and salicylic acids with the composition: [Fe2CrO(C4H3OCOO)6(CH3OH)3]NO3·0.5CH3OH and [Fe2CrO(C6H4(OH)COO)7(CH3OH)2]·2DMA were synthesized starting from iron(III) and chromium(III) salts mixture. The complexes structures were confirmed by elemental analysis, IR, Mössbauer spectroscopies, and X-ray analysis. The atomic absorption spectroscopy confirmed that the iron: chromium ratio is 2:1. The thermal properties of both heteronuclear complexes have been investigated in oxidizing and inert atmospheres revealing the stability of the trinuclear core up to 170 and 220°C, respectively.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"43 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81320474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study described the isolation of β-D-galactopyranoside seco-phytoporphyrin from Atropa belladonna and Solanum tuberosum yellow leaves. Column chromatography was applied for its isolation. The UV-Vis, mass spectrometry and NMR spectroscopy were used for the structure confirmation. The results demonstrate that the two plants that the same chlorophyll catabolite structure.
研究了从颠茄和龙葵黄叶中分离到β- d -半乳糖苷-次生植物卟啉的方法。采用柱层析法分离。用紫外可见光谱、质谱和核磁共振谱对其结构进行了确证。结果表明，两种植物具有相同的叶绿素分解产物结构。
{"title":"β-D-galactopyranoside Seco-phytoporphyrin from Atropa Belladonna and Solanum Tuberosum Yellow Leaves Determined by Nuclear Magnetic Resonance","authors":"N. Djapic","doi":"10.19261/cjm.2021.861","DOIUrl":"https://doi.org/10.19261/cjm.2021.861","url":null,"abstract":"The study described the isolation of β-D-galactopyranoside seco-phytoporphyrin from Atropa belladonna and Solanum tuberosum yellow leaves. Column chromatography was applied for its isolation. The UV-Vis, mass spectrometry and NMR spectroscopy were used for the structure confirmation. The results demonstrate that the two plants that the same chlorophyll catabolite structure.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"57 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88841501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ciocarlan, Lucian Lupascu, A. Aricu, I. Dragalin, N. Ciocârlan, I. Zinicovscaia, V. Slanina, N. Yushin
The GC-MS analysis of the essential oil from Tanacetum corymbosum revealed the presence of 38 compounds, including terpenes - germacrene D, (Z)-β-farnesene, g-elemene, β-caryophyllene, aliphatic - palmitic and linoleic fatty acids, fatty alcohol n-octadecanol, higher alkane n-heneicosane as the major constituents. The in vitro antimicrobial assessment of the ethanolic extract showed promising antibacterial/antifungal activities against five Gram-(+), Gram-(-) and phytopathogenic bacteria species and two fungi strains. The data obtained in this study may be useful both for researchers and for producers interested in new or less studied species of medicinal plants in healthcare and their biological activities.
{"title":"Chemical Composition of the Essential Oil and Antimicrobial Properties of Crude Extract From Tanacetum Corymbosum (L.) Shi. Bip.","authors":"A. Ciocarlan, Lucian Lupascu, A. Aricu, I. Dragalin, N. Ciocârlan, I. Zinicovscaia, V. Slanina, N. Yushin","doi":"10.19261/cjm.2021.877","DOIUrl":"https://doi.org/10.19261/cjm.2021.877","url":null,"abstract":"The GC-MS analysis of the essential oil from Tanacetum corymbosum revealed the presence of 38 compounds, including terpenes - germacrene D, (Z)-β-farnesene, g-elemene, β-caryophyllene, aliphatic - palmitic and linoleic fatty acids, fatty alcohol n-octadecanol, higher alkane n-heneicosane as the major constituents. The in vitro antimicrobial assessment of the ethanolic extract showed promising antibacterial/antifungal activities against five Gram-(+), Gram-(-) and phytopathogenic bacteria species and two fungi strains. The data obtained in this study may be useful both for researchers and for producers interested in new or less studied species of medicinal plants in healthcare and their biological activities.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"11 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86465138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Zozulia, V. Ovchynnikov, T. Slyva, J. Rusanova, V. Amirkhanov
The novel binuclear Zn(II) complex of general formula Zn2(L)4(CH3OH)2 where HL is N-[bis(benzylamino)phosphoryl]-2,2,2-trichloroacetamide has been synthesized from non-aqueous solution and characterized by elemental analysis, FTIR and NMR spectroscopy as well by X-ray single crystal diffraction. This complex represents the third example of binuclear complexes with this ligand within four known for today.
{"title":"Synthesis and Crystal Structure of New Zn(II) Complex with N-[bis(benzylamino)phosphoryl]-2,2,2-trichloroacetamide","authors":"V. Zozulia, V. Ovchynnikov, T. Slyva, J. Rusanova, V. Amirkhanov","doi":"10.19261/cjm.2021.881","DOIUrl":"https://doi.org/10.19261/cjm.2021.881","url":null,"abstract":"The novel binuclear Zn(II) complex of general formula Zn2(L)4(CH3OH)2 where HL is N-[bis(benzylamino)phosphoryl]-2,2,2-trichloroacetamide has been synthesized from non-aqueous solution and characterized by elemental analysis, FTIR and NMR spectroscopy as well by X-ray single crystal diffraction. This complex represents the third example of binuclear complexes with this ligand within four known for today.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"15 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75603485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This review paper is focused on the detailed consideration of the structure, properties and reactions of H2O2. The paper highlights the importance of revealing these processes’ mechanisms, since they have been insufficiently studied so far, or the related data have a fragmentary and incomplete character. A special attention is given to catalytic oxidation reactions, formation and properties of intermediates, their role in the natural environment.
{"title":"Hydrogen Peroxide in Ecological and Environmental Chemistry","authors":"G. Duca","doi":"10.19261/cjm.2021.918","DOIUrl":"https://doi.org/10.19261/cjm.2021.918","url":null,"abstract":"This review paper is focused on the detailed consideration of the structure, properties and reactions of H2O2. The paper highlights the importance of revealing these processes’ mechanisms, since they have been insufficiently studied so far, or the related data have a fragmentary and incomplete character. A special attention is given to catalytic oxidation reactions, formation and properties of intermediates, their role in the natural environment.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"14 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88600446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
On March 3-4, 2022, the Society of Chemistry of the Republic of Moldova, the Institute of Chemistry, the Faculty of Chemistry and Chemical Technology of the State University of Moldova intends to organize the VII International Conference EEC-2022, dedicated to the 70th anniversary from the birthday of the illustrious scientist Gheorghe Duca. The current jubilee is an occasion to pay a beautiful homage and gratitude to this tireless researcher and organizer of science, whose activity is a worthy example to follow of serving the nation and the land.
{"title":"The Scientific and Managerial Ideas of Academician Gheorghe Duca Are Realized Successfully Because These Are Based on Knowledge","authors":"T. Lupascu, A. Aricu","doi":"10.19261/cjm.2021.921","DOIUrl":"https://doi.org/10.19261/cjm.2021.921","url":null,"abstract":"On March 3-4, 2022, the Society of Chemistry of the Republic of Moldova, the Institute of Chemistry, the Faculty of Chemistry and Chemical Technology of the State University of Moldova intends to organize the VII International Conference EEC-2022, dedicated to the 70th anniversary from the birthday of the illustrious scientist Gheorghe Duca. The current jubilee is an occasion to pay a beautiful homage and gratitude to this tireless researcher and organizer of science, whose activity is a worthy example to follow of serving the nation and the land.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"23 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86831606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effect of the nature and concentration of d-metal salts attached to synthetic zeolites NaA and KA on the kinetic and stoichiometric parameters of the chemisorption-catalytic oxidation of sulphur dioxide with air oxygen at ambient temperature was studied. It was found that the adsorption capacity of NaA zeolite relative to SO2 is 100 times higher than that of KA zeolite; the time of protective action of NaA and KA zeolites increases upon modification with transition metal salts and with an increase of their content in the compositions. It was shown that the formation of inner and outer sphere complexes and the relationship between them is determined by the nature and concentration of metal ions and by the nature of the carrier. It was proven that the chemisorption-catalytic process ends with the oxidation of SO2 to H2SO4.
{"title":"Synthetic Zeolites Modified with Salts of Transition Metals in the Reaction of Chemisorption-catalytic Oxidation of Sulphur Dioxide by Air Oxygen","authors":"T. Rakitskaya, T. Kiose, L. Raskola","doi":"10.19261/cjm.2021.913","DOIUrl":"https://doi.org/10.19261/cjm.2021.913","url":null,"abstract":"The effect of the nature and concentration of d-metal salts attached to synthetic zeolites NaA and KA on the kinetic and stoichiometric parameters of the chemisorption-catalytic oxidation of sulphur dioxide with air oxygen at ambient temperature was studied. It was found that the adsorption capacity of NaA zeolite relative to SO2 is 100 times higher than that of KA zeolite; the time of protective action of NaA and KA zeolites increases upon modification with transition metal salts and with an increase of their content in the compositions. It was shown that the formation of inner and outer sphere complexes and the relationship between them is determined by the nature and concentration of metal ions and by the nature of the carrier. It was proven that the chemisorption-catalytic process ends with the oxidation of SO2 to H2SO4.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"35 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72763811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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