Russian Journal of Physical Chemistry A最新文献_第2页

Vapor–Liquid Equilibrium Measurement of Methanol–Chloroform–Tetrahydrofuran and Methanol–Chloroform–Tetrahydrofuran–Dimethyl Sulfoxide Mixtures at 101.32 kPa

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702509

V. I. Zhuchkov, V. M. Raeva, D. A. Ryzhkin

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Shielding and Electromagnetic Radiation-Absorbing Properties of Shugnite-Containing Materials

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Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702649

Yu. V. Samukhina, A. K. Buryak

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Dechlorination of Chloride–Sulfate Solutions Using Ozone

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Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702558

A. V. Levanov, A. O. Orujev, O. Ya. Isaikina

{"title":"Dechlorination of Chloride–Sulfate Solutions Using Ozone","authors":"A. V. Levanov, A. O. Orujev, O. Ya. Isaikina","doi":"10.1134/S0036024424702558","DOIUrl":"10.1134/S0036024424702558","url":null,"abstract":"Kinetic characteristics are determined for the release of chlorine during the oxidation of chloride ion in solutions Na+–H+–HSO(_{4}^{ - })–Cl−, Mg2+–H+–HSO(_{4}^{ - })–Cl−, Zn2+–H+–HSO(_{4}^{ - })–Cl−, Cu2+–H+–HSO(_{4}^{ - })–Cl−, Fe3+–H+–HSO(_{4}^{ - })–Cl−, Mg2+–H+–Cl−, and Ca2+–H+–Cl−. With similar experimental parameters, the rate of the reaction acquires considerably different values, depending on the nature of the added salt. This is due to the possible catalysis of the reaction between O3 and the Cl−(aq) cations of some metals; the formation of chloride and sulfate metal complexes, which alters the actual concentrations of reagents; and a change in the solubility of ozone. The solubility of ozone, the values of the Henry constant, and the Sechenov coefficient are found for aqueous solutions of zinc sulfate and magnesium sulfate with concentrations of 0–1 M at temperatures of 20 and 25°C.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"38 - 43"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638184","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}

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Stationary Redox Sorption of Oxygen Dissolved in Water on Granular Layers of Copper-Ion-Exchange Nanocomposites

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Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702625

T. A. Kravchenko, O. A. Kozaderov, D. D. Vakhnin, I. A. Golovin, A. E. Martynov

{"title":"Stationary Redox Sorption of Oxygen Dissolved in Water on Granular Layers of Copper-Ion-Exchange Nanocomposites","authors":"T. A. Kravchenko, O. A. Kozaderov, D. D. Vakhnin, I. A. Golovin, A. E. Martynov","doi":"10.1134/S0036024424702625","DOIUrl":"10.1134/S0036024424702625","url":null,"abstract":"Abstract—The process of redox sorption of oxygen dissolved in water on cathodically polarized granular layers of copper-ion-exchange nanocomposites was studied depending on the water flow rate and the value of the polarizing current. It is noted that initially the amount of absorbed oxygen exceeds the amount of electricity that passed. Over time, the chemical activity of the nanocomposite decreased, and oxygen continued to be sorbed and further restored mainly due to the current component of the process. It was concluded that the simultaneous increase in the water flow rate and the maximum permissible current strength has a beneficial effect on the rate of oxygen absorption. Maintaining a constant water supply mode and corresponding current strength provides a steady flow of diffusion and chemical and electrochemical stages. It has been established that the successive stages of external diffusion transfer of oxygen to the surface of nanocomposite grains, internal diffusion transfer of oxygen through grain pores, and chemical oxidation of copper nanoparticles to oxides, which is characteristic of final sources, are compensated by the stages of electroreduction of oxygen from surface adsorbed complexes and regeneration of oxidation products into metallic copper nanoparticles. The nanocomposite is a continuous source of freshly reduced metal particles and promotes the process of oxygen redox sorption to reach a steady state. Unlike the unpolarizable granular layer, the oxygen concentration remains at a low constant level under conditions of the maximum permissible imposed electric current.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"75 - 83"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638440","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}

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Comparison of the Catalytic Properties of Pt and Co Cathodes for the Nitrite Reduction Reaction to Ammonia

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Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702698

I. I. Kuznetsova, O. K. Lebedeva, D. Yu. Kultin, L. M. Kustov

{"title":"Comparison of the Catalytic Properties of Pt and Co Cathodes for the Nitrite Reduction Reaction to Ammonia","authors":"I. I. Kuznetsova, O. K. Lebedeva, D. Yu. Kultin, L. M. Kustov","doi":"10.1134/S0036024424702698","DOIUrl":"10.1134/S0036024424702698","url":null,"abstract":"The authors study the electrochemical reduction of nitrites (NO(_{2}^{ - })RR) in a neutral aqueous electrolyte. This reduction reaction has important applications both for future ammonia synthesis processes for effective treatment of industrial and agricultural wastewaters. Catalytic activity is compared (results on the Faradaic efficiency and yield rate of ammonia are presented) for noble (platinum) and non-noble (cobalt) metals. Metallic polycrystalline platinum and cobalt serve as electrocatalysts. The surfaces of the catalysts are analyzed via SEM and optical microscopy. Linear voltammetry is used to preliminarily identify the potential of ammonia synthesis and estimate the current density of synthesis. The Faradaic efficiency (FE) and yield rate of ammonia release are obtained for five selected values of current densities (J). It is found that a cobalt cathode is most efficient (FE ≈ 99%, yield rate (NH3) = 2.4 mmol h−1 cm−2), which exceeds the values for the platinum cathode (FE = 88.1%, yield rate (NH3) = 0.4 mmol h−1 cm−2). The electrochemically active surfaces (ECSAs) of the electrocatalysts are determined. This activity of catalysts is explained according to results in this work, and shows that a non-noble metal cathode can be more effective for NO(_{2}^{ - })RR.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"105 - 110"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638147","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}

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The Determining Role of Heterogeneous Reactions of Atoms and Radicals in the Spread of a Flame

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S003602442470273X

V. V. Azatyan, V. M. Prokopenko, N. N. Smirnov, S. K. Abramov

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Some Electrochemical Phenomena Accompanying the Destruction of Nanocluster Polyoxomolybdate Mo132

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Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702637

A. A. Ostroushko, I. D. Gagarin, A. E. Permyakova

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Concentration Dependences of the Heat Capacity of Ammonium Iodide Solutions in Mixed N-Methylpyrrolidone–Water Solvent at 298.15 K

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702583

A. N. Novikov, E. I. Kostyleva, V. P. Bondarev, V. A. Vasiliev

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Solubilization of the New Generation Immunomodulator Fingolimod Using Natural, Modified, and Polymeric Cyclodextrins

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-02-11 DOI: 10.1134/S0036024424703096

A. A. Garibyan, E. S. Delyagina, I. V. Terekhova

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Using Graph Neural Networks to Predict Positions of the Absorption Maxima of a Number of Dyes 使用图神经网络预测多种染料吸收最大值的位置

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2025-02-11 DOI: 10.1134/S003602442470287X

M. M. Lukanov, A. A. Ksenofontov

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