Russian Journal of Applied Chemistry最新文献

{"title":"Synthesis and Luminescence Properties of a New Complex of Divalent Europium with Cinnamic Acid, Eu(L)2(THF)4 (L = Cinnamate Anion, С6H5СH=СHCOO–)","authors":"D. I. Galimov,&nbsp;K. S. Vasilyuk,&nbsp;S. M. Yakupova,&nbsp;R. G. Bulgakov","doi":"10.1134/S1070427224040037","DOIUrl":"10.1134/S1070427224040037","url":null,"abstract":"<p>A previously unknown luminescent complex of divalent europium, Eu(L)₂(THF)₄ (L = cinnamate anion, С₆H₅СH=СHCOO^–), was prepared by the reaction of europium(III) cinnamate crystal hydrate Eu(L)₃∙H₂O with diisobutylaluminum hydride (<i>iso-</i>C₄H₉)₂AlH in tetrahydrofuran at room temperature and atmospheric pressure. The complex Eu(L)₂(THF)₄ was isolated in the solid state and was characterized by complexometric titration (Eu²⁺) and elemental analysis (C, H, O). The yield of the complex Eu(L)₂(THF)₄ was 68%. The quantum yield of the photoluminescence (PL) of the complex (φ_PL = 0.05), the PL and PL excitation spectra, and the lifetime (τ = 377 ns) of the europium excited state, Eu²⁺*, in the complex were measured. The PL of the complex Eu(L)₂(THF)₄ is due to the interconfigurational transition 4<i>f</i>⁶5<i>d</i>¹ → 4f⁷ and is manifested as a broad diffuse band in the green part of the spectrum (λ_PL = 515 nm) with the nanosecond lifetime of the excited Eu²⁺* ions. The complex Eu(L)₂(THF)₄ exhibiting bright PL visible by naked eye can be used as a phosphor in the development of new materials with preset photophysical properties.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"409 - 413"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Liquid Phase Peroxide Oxidation of Phenol in the Presence of Catalysts Based on Mixed Oxides of Transition Metals and Cellulose","authors":"A. A. Perebeinos,&nbsp;T. I. Mishchenko,&nbsp;V. V. Gurovskii,&nbsp;T. B. Medvedeva,&nbsp;D. A. Yatsenko,&nbsp;N.V. Gromov","doi":"10.1134/S1070427224050021","DOIUrl":"10.1134/S1070427224050021","url":null,"abstract":"<p>The work is devoted to the study of the process of water purification from phenol, which was oxidized in the process of liquid-phase peroxide oxidation in the presence of catalysts of composite materials based on MeFe₂O₄ (Me = Mn, Co, Mg, Cu) and cellulose. The textural and acidic properties of the catalysts were studied. It was shown that the main phase of the catalysts is MeFe₂O₄, acidity of aqueous suspensions of catalysts are neutral and slightly alkaline. Among the tested catalysts, the CuFe₂O₄/CMC (microcrystalline cellulose) sample had the greatest efficiency, in the presence of which the phenol conversion was achieved 100% for 20 min of reaction time. Copper and manganese had the greatest effectiveness as Me in the MeFe₂O₄/CMC system.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 5","pages":"493 - 506"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of the Gas Medium Composition on the Thermal Decomposition of Ammonium, Sodium, Potassium, and Calcium Hypophosphites","authors":"A. L. Vereshchagin,&nbsp;E. D. Minin,&nbsp;N. V. Bychin,&nbsp;E. A. Morozova","doi":"10.1134/S1070427224040074","DOIUrl":"10.1134/S1070427224040074","url":null,"abstract":"<p>The key step of the thermal decomposition of hypophosphites is disproportionation determining the phase composition and morphology of the final products. The distinctive features of the thermal decomposition of hypophosphites are the formation of polyphosphoric acid from ammonium hypophosphite and of red phosphorus from the metal hypophosphites. The thermal decomposition of hypophosphites in air is accompanied by large heat release.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"395 - 401"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetics of Photooxidation of Dihydric Phenols in the Presence of Hydrogen Peroxide and Potassium Persulfate","authors":"M. A. Vetrova,&nbsp;N. A. Ivantsova,&nbsp;P. R. Karataeva","doi":"10.1134/S1070427224040062","DOIUrl":"10.1134/S1070427224040062","url":null,"abstract":"<p>Wastewater treatment to remove organic ecotoxicants is one the most important problems today. Scientists’ efforts throughout the world are focused on searching for effective and harmless technologies for the removal and/or complete degradation of organic pollutants. One of the solutions is the use of UV lamps in combination with various oxidants. UV irradiation is widely used in various branches of industry, especially in water treatment. Photolysis methods are environmentally clean and are included in handbooks of the best available technologies. Experiments performed in this study were aimed at revealing kinetic relationships of the photochemical degradation of dihydric phenols in aqueous solutions under the action of active species. All the processes were performed using a flow-through laboratory installation. A 9 W, 254 nm OSMAR special ozone-free bactericidal lamp (Finland) was chosen as a UV radiation source. The residence time of the model solution in the reactor was varied from 20 to 120 s. Quantitative determination of dihydric phenols was performed by the spectrophotometric method. Hydrogen peroxide (3% solution) and potassium persulfate were chosen as oxidizing additives. The potential of the UV radiation and oxidative treatment for efficient removal of dihydric phenols from water was evaluated. Photooxidation of pyrocatechol, resorcinol, and hydroquinone in aqueous solution in the presence of hydrogen peroxide and potassium persulfate was performed. The oxidants were taken in amount from stoichiometric to fivefold excess relative to the stoichiometry. The photochemical degradation of dihydric phenols can be performed with up to 99% efficiency. At the phenol : oxidant molar ratio of 1 : 5, the photooxidation rate increases by a factor of 3–5. The degradation involves the breakdown of the benzene ring, and the main degradation products of dihydric phenols are monobasic carboxylic acids and formaldehyde.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"441 - 447"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Strontium Aluminate Addition on the Mechanical and Surface Properties of Hardened Cement Pastes","authors":"Basant G. Salib,&nbsp;Hany M. Abdel Dayem,&nbsp;Fouad I. El-Hosiny","doi":"10.1134/S1070427224040025","DOIUrl":"10.1134/S1070427224040025","url":null,"abstract":"<p>Hardened cement pastes made of ordinary Portland cement (OPC) and strontium aluminate (Sr₄Al₁₄O₂₅)-Sol were made using a water cement ratio of 0.257 weight by weight. Two pastes containing (Sr₄Al₁₄O₂₅)-Sol with 1 and 3% content by the weight of OPC were prepared. All pastes were cured for various time intervals within the range of 1 to 28 days. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), compressive strengths, and surface properties were studied and related as much as possible to the pore structure of the hardened pastes (1 and 3%). The addition of strontium aluminate to OPC results in an increase in the values of specific surface area and a decrease in values of average pore diameter of the hardened pastes (1 and 3%) as compared to the hardened neat cement pastes (OPC); this led to a higher value of compressive strengths of hardened cement pastes (Sr₄Al₁₄O₂₅)-Sol admixtire, especially at 1% addition.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"402 - 408"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of Novel Pyrazole Cyclic Polymer/Montmorillonite Nanocomposites and Their Thermal Decomposition Kinetics","authors":"Adnan Kurt,&nbsp;Serap Avcı,&nbsp;Murat Koca","doi":"10.1134/S107042722404013X","DOIUrl":"10.1134/S107042722404013X","url":null,"abstract":"<p>In present work, a series of novel pyrazole cyclic polymer poly(1,3-diphenyl-1<i>H</i>-pyrazol-5-yl methacrylate)/montmorillonite based nanocomposites, [poly(DPMA/OMMT : 2-7wt%) were prepared by in situ polymerization technique. Organic-modifier was vinylbenzyldimethylhexadecyl ammonium chloride. The X-ray diffraction analysis (XRD) showed that the clay dispersion in the polymer matrix was exfoliated type for all nanocomposites. A positive change was observed between the reinforced clay ratio and the thermal stability of the nanocomposites from thermogravimetry (TGA). It was determined that the nanocomposite with 7 wt % clay content was approximately 34.9°C more thermally stable than the undoped polymer. Thermal kinetic analysis of the decomposition process of nanocomposites in a conversion range of 7–19% was evaluated from dynamic experiments by means of various kinetic models such Flynn–Wall–Ozawa, Kissinger, Coats–Redfern, Tang and Madhusudanan methods. Doping the organoclay into the pyrazole polymer increased the activation energy from 79.5 to 109.5 kJ/mol compared to pure polymer. The results obtained from kinetic methods showed that all nanocomposites proceed via the thermal decomposition mechanism, <i>D</i>₁, one-dimensional diffusion type deceleration mechanism.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"429 - 440"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of Silylated Ti–SiO2 Prepared by Chemical Vapor Deposition and Its Catalytic Performance in Green Epoxidation of Soybean Oil","authors":"Xuefeng Li,&nbsp;Like Zhang","doi":"10.1134/S1070427224040013","DOIUrl":"10.1134/S1070427224040013","url":null,"abstract":"<p>Silylated Ti–SiO₂ (S–Ti–SiO₂) was prepared by the chemical vapor deposition of TiCl₄ and following hexamethyldisilazane (HMDS) on SiO₂. Its specific surface area and pore size are decreased compared with Ti-SiO₂ while it keeps highly dispersed Ti species with low coordination. More importantly, S–Ti–SiO₂ possesses higher hydrophobicity than Ti-SiO₂, which can explain the fact that it performs better than Ti-SiO₂ in catalytic epoxidation of soybean oil using 30% aqueous H₂O₂ as oxidant. The relative conversion to oxirane (RCO) of S–Ti–SiO₂ can reach 27% and the catalyst can be used 3 times under the best reaction conditions.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"454 - 462"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical Properties and Photocatalytic Activity of the CeО2/SnO2 Thin-Film Heterostructure","authors":"D. M. Skryleva,&nbsp;O. S. Khalipova,&nbsp;S. A. Kuznetsova","doi":"10.1134/S1070427224040086","DOIUrl":"10.1134/S1070427224040086","url":null,"abstract":"<p>The discharge of wastewater without proper treatment gives rise to environmental problems. One of the ways to solve them is photocatalytic decomposition of organic pollutants in wastewater. This method attracts researchers’ attention as being simple and cheap. Powdered semiconductor oxide materials exhibiting good adsorption properties toward organic compounds, photochemical stability, and nontoxicity are mainly used as photocatalysts. Tin(IV), titanium(IV), zinc(II), and cerium(IV) oxides exhibit such properties. The possibility of using as photocatalysts thin-film materials, which can be readily separated from the treated water, has been demonstrated recently. In addition, it is known that heterostructures enhance the photocatalytic activity of the material, in particular, by decreasing the bandgap, which allows more efficient absorption of visible light by the substance. This study compares the optical properties of the SnO₂, CeO₂, and CeO₂/SnO₂ thin-film materials on quartz supports. The materials were prepared by the sol–gel method from film-forming solutions based on cerium(III) nitrate and/or tin(IV) chloride with salicylic acid. The film thickness and refractive index were studied by ellipsometry, and the transmittance was examined by spectrophotometry. The photocatalytic properties of CeO₂/SnO₂ thin-film materials were demonstrated in the model reaction of the decomposition of an organic dye, Methylene Blue, under UV irradiation (312 nm) in the daylight and in the dark. Films with the CeO₂/SnO₂ heterostructure having the thickness of 124 nm, refractive index of 1.33, and transmittance higher than 70% in the wavelength range 440–1000 nm absorb the visible light more efficiently than the SnO₂ and CeO₂ thin-film materials do. The photocatalytic activity of CeO₂/SnO₂ films under UV irradiation in the daylight is higher than that under UV irradiation in the dark. The amount of Methylene Blue decomposing under UV irradiation in the daylight is 1.2 times larger than that decomposing under UV irradiation for the same time in the dark.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"448 - 453"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diclofenac Degradation in Aqueous Solutions Using Advanced Oxidative Processes","authors":"L. N. Skvortsova,&nbsp;V. M. Makarova,&nbsp;K. A. Dychko,&nbsp;K. A. Bolgaru","doi":"10.1134/S1070427224040050","DOIUrl":"10.1134/S1070427224040050","url":null,"abstract":"<p>The photocatalytic activity of iron-containing metal–ceramic composites based on silicon nitride modified with semiconductor tantalum oxo compounds in oxidative degradation of diclofenac (DCF) was studied. The composites were synthesized by autowave combustion of ferrosilicoaluminum with different additions (5, 10, 15 wt %) of tantalum metal in a nitrogen atmosphere. The phase composition was determined by X-ray diffraction and IR spectroscopy, and the content of elements in local surface areas was quantitatively evaluated by electron microprobe analysis. The activity of composites under the conditions of heterogeneous photocatalysis, heterogeneous photocatalysis combined with photo-Fenton and Peroxone processes under UV irradiation, and catalytic ozonation under UV and visible light irradiation was studied. The combination of heterogeneous photocatalysis and Peroxone process is the most effective. The Lаngmuir–Hinshelwood scheme was applied to elucidate the mechanism of DCF photocatalytic degradation.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 4","pages":"422 - 428"},"PeriodicalIF":0.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lignin-Based Adhesives: Extraction, Chemical Modification, and Challenges in Production","authors":"Seyed Naser Razavi,&nbsp;Maryam Nikzad,&nbsp;Masoumeh Taherimehr","doi":"10.1134/S1070427224030029","DOIUrl":"10.1134/S1070427224030029","url":null,"abstract":"<p>This review article explores the potential of lignin as a sustainable alternative to conventional petroleum-based adhesives. Conventional adhesives derived from petroleum sources have been widely used in industrial, medical, and household applications. However, the depletion of petroleum resources and environmental and human health concerns have prompted the search for bio-based and environmentally friendly alternatives. Lignin, a biodegradable substance abundant in nature, has emerged as a promising substitute due to its non-toxic nature, three-dimensional structure, and functional groups. Replacing the chemicals used in conventional adhesives with lignin can reduce production costs, and the resulting adhesives exhibit decreased toxicity. Furthermore, lignin can be combined with biobased materials to create bio-based adhesives. This article provides an overview of lignin extraction methods, explores the diverse applications of lignin in various industries, discusses chemical modifications of lignin, and specifically focuses on the production of lignin-based adhesives. Finally, the challenges associated with lignin-based adhesive production are addressed.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"97 3","pages":"297 - 312"},"PeriodicalIF":0.6,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}