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Russian Journal of Physical Chemistry A

Current research reports and chronological list of recent articles..




Focus on Chemistry (Zhurnal fizicheskoi khimii), founded in 1930, the scientific Russian Journal of Physical Chemistry A offers a comprehensive review of theoretical and experimental research not only from the Russian Academy of Sciences but also from the entire Commonwealth of Independent States. Articles published concern chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of solutions, surface phenomena and absorption, and methods and techniques of physicochemical investigations.

The publisher is Springer. The copyright and publishing rights of specialized products listed below are in this publishing house. This is also responsible for the content shown.

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Additional research articles see Current Chemistry Research Articles. Magazines with similar content (physical chemistry):

 - ChemPhysChem.

 - Doklady Physical Chemistry.

 - Faraday Discussions.

 - Journal of Physical Chemistry A.

 - Journal of Physical Chemistry B.

 - Journal of Physical Chemistry C.

 - Journal of Physical Organic Chemistry.

 - Physical Chemistry Chemical Physics PCCP.

 - Russian Journal of Physical Chemistry B.



Russian Journal of Physical Chemistry A - Abstracts



Adsorption of Neonol AF 9-10 on Carbon Mineral Adsorbents Based on Natural Aluminosilicate and Crumb Rubber

Abstract

Carbon mineral adsorbent (CMA) samples based on natural montmorillonite clay and crumb rubber are obtained. Their physicochemical properties are characterized via X-ray fluorescence, powder X-ray diffraction, and low-temperature nitrogen adsorption. The carbon content on the clay surface is shown to grow along with the temperature of pyrolysis. Isotherms are obtained for the adsorption of neonol AF 9–10 from aqueous solutions onto CMA samples pyrolized at 450–800°C. A sample pyrolized at 650°C has better adsorption properties than those of commercial activated charcoals.


Datum: 01.06.2022


Sorption of Amphenicols on Magnetic Hypercrosslinked Polystyrene

Abstract

A study is performed of the sorption of chloramphenicol, florfenicol, and thiamphenicol on magnetic hypercrosslinked polystyrene (HCPS/Fe3O4). Magnetic HCPS is obtained via the sorption of Fe3O4 nanoparticles on commercially available HCPS Diapak P-3. The specific surface areas and parameters of the porous structure of the magnetic HCPS are determined by means of low-temperature nitrogen adsorption. It is found that introducing Fe3O4 nanoparticles into the HCPS matrix slightly lowers the specific surface area of the sorbent (from 1132 to 1080 m2/d) and the volume of pores, but these characteristics are strong enough to use the resulting composite as a sorbent. It is established that the HCPS-based magnetic sorbent exhibits superparamagnetic properties. The saturation magnetization is 1.7 emu/g, enough to extract the sorbent from the solution under the action of the magnetic field of a permanent magnet. It is shown that magnetic HCPS can be used for the group sorption concentration of amphenicols via magnetic solid-phase extraction.


Datum: 01.06.2022


Solvate Ionic Liquids: Assessing the Possibility of Determining the Composition by Means of Gas–Liquid Chromatography

Abstract

A study is performed of the possibility of using gas–liquid chromatography (GLC) to determine the composition of solutions of lithium salts in aprotic dipolar solvents and solvate ionic liquids. The objects of study are solutions of lithium perchlorate and lithium trifluoromethanesulfonate in sulfolane and solvate complexes of lithium perchlorate with sulfolane obtained in two ways: direct interaction of the initial components in a given molar ratio and interaction of the components in a common solvent with its subsequent removal via evaporation. It is shown that GLC is a convenient way of determining the content of a solvating solvent in the composition of solutions and solvate ionic liquids. The presence of lithium salt in the analyzed solutions does not affect the period of retention; instead, it raises the degree of asymmetry of the chromatographic peak of the solvent and manifestation of the tailing effect. It is found that the presence of salt in the considered system also does not reduce the accuracy of determining the solvent content. The error in determining the content of solvent in solutions of lithium salts and solvate complexes by GLC is no greater than 1%.


Datum: 01.06.2022


Voltammetric Determination of Acetaminophen with Ag/PANI/PW12 Nanocomposites-Modified Carbon Paste Electrodes

Abstract

In this research, Ag polyaniline heteropoly acid (Ag/PANI/PW12) nanocomposites and modified electrodes were used to modify carbon paste electrode (CPE) voltammetric determination of paracetamol, respectively. Differential pulse voltammetry was investigated in potassium chloride (KCl) electrolyte at the modified electrode surface and successfully applied to paracetamol in a potential range of 0.5–1 V under different pH conditions. However, the best result was obtained at pH 2.0. The results also revealed that the modified electrode shows an electrocatalytic activity towards the paracetamol oxidation under the optimum conditions. The anodic peak current showed a linear relationship with paracetamol concentrations in a range of 6.62 × 10–8–9.29 × 10–5 M, with a regression equation of Y = 2 × 10–5Х – 1 × 10–6 (R2 = 0.9999) and a limit of detection of 0.016 μM (signal-to-noise ratio = 3). The cyclic voltammetric results showed a well-defined oxidation peak with good reproducibility for the modified electrode (RSD = 2.6, n = 10). This technique was applied to the demonstration of paracetamol in wastewater and paracetamol tablet samples.


Datum: 01.06.2022


BiOCl Flower Photocatalyst Heterostructured with Magnetic Carbon Nanodots Bi25FeO40–g-C3N4 for Visible-Light-Driven Efficient Photodegradation of Tetracycline Hydrochloride

Abstract

Magnetic BiOCl flowers were fabricated using a one-pot hydrothermal process by self-assemble of BiOCl nanosheets on magnetic carbon nanodots (MCDs) Bi25FeO40–g-C3N4. The photodegradation activities of the heterojunctions were detected for Tetracycline hydrochloride (TC) as antibiotic target pollutant. The degradation rate of ternary junction was detected to be 6.5 times faster than bare BiOCl. The attractive performance mainly attributed to synergistic effects resulting from the formation of npn heterojunction, especially MCDs can not only provide the high specific surface area, but suppress the recombination of photogenerated electron–hole pairs. Trapping experiments approve that h+ and \( \bullet {\kern 1pt} {\text{OH}}\) radicals were the major reactive species, meanwhile \( \bullet {\kern 1pt} {\text{O}}_{2}^{ - }\) radicals also involved in the process of TC photodegradation on BiFeCN catalysts, therefore a possible z-scheme reaction mechanism was proposed correspondingly.


Datum: 01.06.2022


Facile Synthesis, Optical and Photoluminescence Properties of Copper Tungstate Phosphors with Strong Near-Infrared Photoabsorption

Abstract

Herein, we demonstrate for the first time the synthesis of copper tungstate (CuWO4) crystal by a facile polyacrylamide gel route. X-ray diffraction patterns reveal that the pure phase CuWO4 obtained by calcining xerogel at 900°C has the triclinic crystal structure. The component of prepared CuWO4 are further confirmed by the X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Transmission electron microscope results demonstrate that the CuWO4 has high crystallinity. Ultraviolet-visible absorption spectra indicate that the samples have remarkable photoabsorption in the near-infrared region. Photoluminescence spectra show that the CuWO4 has an emission peak at 583 nm with excitation wavelength of 430 nm. The synthesized CuWO4 phosphors with attractive optical and photoluminescence properties have potential applications in photoelectric devices and lasers.


Datum: 01.06.2022


Luminescent Properties of Neodymium(III) p-Toluates

Abstract

A study is performed of the synthesis and luminescent behavior of neodymium(III) complexes with p-methylbenzoic (p-toluic) acid and nitrogen- and phosphor-containing ligands. The complexes are Nd[(р‑MBA)3⋅D]2xH2O and [Nd(р-MBA)3⋅2H2O]n, where р-MBA is the anion of p-methylbenzoic acid and D is 1,10-phenanthroline (phen), 2,2'-dipyridil (dipy), triphenylphosphine oxide (tppo), or hexamethylphosphotriamide (hmpa) (x = 1). Their electronic absorption and luminescence spectra are analyzed along with the structure of electronic transitions in luminescence spectra of the complex neodymium(III) p-toluates. Triplet levels in p- and m-methylbenzoic acids are calculated. The relationship between the intensity of luminescence and the composition of coordination sphere of prepared neodymium(III) complexes is established. Neodymium(III) complexes with p-toluic acid, hexamethylphosphotriamide, and triphenylphosphine oxide are found to exhibit the most intense luminescence in the IR region.


Datum: 01.06.2022


Extracting Yttrium, Lanthanum, and Europium with Phosphine Oxides of the Hexyl–Octyl Series

Abstract

Samples of mono- and different radical phosphine oxides of the hexyl–octyl series are synthesized according to Grignard and their composition is determined. The extraction of yttrium, lanthanum, and europium from nitric acid media both individually and upon co-presence is studied. The order of change in the extraction properties of alkylphosphine oxides for individual rare-earth metals (REMs) is obtained. The highest percentage of REM extraction is achieved at a nitric acid concentration of ~0.5 M in the aqueous phase. The percentages of individual REM extraction under these conditions are determined to be 90–97% for yttrium, 75–91% for lanthanum, and 93–98% for europium. The percentages of combined extraction were 68–82, 45–62, and 80–88%, respectively. The data suggest that REMs of the yttrium group can be separated from those of the cerium group, and this can be used in preparing pure REMs.


Datum: 01.06.2022


Thermodynamic Properties of Gadolinium Tantalate Gd3TaO7

Abstract

Relaxation, adiabatic, and differential scanning calorimetry in the 2–1350 K range of temperatures are used to measure the molar heat capacity of synthesized gadolinium tantalate Gd3TaO7 characterized via X-ray diffraction, scanning electron microscopy (SEM), and chemical analysis. Such thermodynamic functions of the sample as entropy, the change in enthalpy, and reduced Gibbs energy are calculated. The enthalpy of formation of Gd3TaO7 from elements is determined from literature data. Gadolinium tantalate’s Gibbs energy of formation from oxides in the range of high temperatures is calculated to estimate the stability of gadolinium tantalate relative to its constituent oxides.


Datum: 01.06.2022


Equilibrium in a Bovine Serum Albumin–Pyridoxal-5-phosphate 4-Hydroxybenzoyl Hydrazone–La3+ Ion System

Abstract

Fluorescence spectrometry is used to study the interaction between hydrazone formed by pyridoxal-5-phosphate and 4-hydroxybenzoic acid hydrazide with bovine serum albumin in solution. The constant of bonding hydrazone to the protein is calculated in two ways, and the calculation procedures are discussed. A solution containing hydrazone, La3+ ions, and bovine serum albumin is studied spectrophotometrically. It is shown that a rise in the concentration of protein gradually destroys the lanthanum(III)–hydrazone complex, due to the ligand bonding to the protein.


Datum: 01.06.2022


Synthesis of Consolidated Carbon Nanomaterials by Spark Plasma Sintering

Abstract

Few-layer graphene nanoflakes (GNFs) containing 8–10 graphene layers were treated at temperatures of 600–1800°C and pressures of 10–50 MPa by spark plasma sintering. At 600°С, the GNF powders did not consolidate; sintering with formation of pellets occurred at 1200–1800°С. As the temperature and pressure of sintering increased, the graphite structure became improved, and the number of carbon layers increased to 15–20; all the sintered samples were mesoporous.


Datum: 01.06.2022


Standard Enthalpies of Formation of Alanyl-Phenylalanine and Products of Its Dissociation in Aqueous Solutions

Abstract

Direct calorimetry is used to measure the heats of dissolution of crystalline alanyl-phenylalanine in water and solutions of potassium hydroxide at 298.15 K. The standard enthalpy of formation of glutathione in the crystalline state is determined using the additive group approach. The technique is based on group systematics with fragments classified according to Benson in order to consider the influence of the primary environment for atoms. Standard enthalpies of formation are calculated for alanyl-phenylalanine and products of its dissociation in aqueous solutions.


Datum: 01.06.2022


Dispersion of Single-Walled Carbon Nanotubes in Ethanol–Cholic Acid Mixtures: Experiments and Molecular Dynamic Simulation

Abstract

Approaches are developed to preparing and studying suspensions of single-walled carbon nanotubes in ethanol with a nonionic surfactant. A nonlinear dependence is established for the dispersion of single-walled carbon nanotubes on the concentration of a surfactant (cholic acid). Results can be used as the basis for developing technologies of creating new construction materials.


Datum: 01.06.2022


The Regulation of Spinel Precursors Reactivity by Means of a Mechanical and a Microwave Treatment

Abstract

Nickel aluminate spinel synthesis from oxides, hydroxides and nitrates of nickel and aluminum was investigated. The precursors reactivity was compared by means of effective rate constants. Oxide precursors reacted with the substantially less rate in comparison with hydroxides and salts. The influence of a preliminary mechanical activation by mainly impact (planetary mill) and attrition (ball-ring mill) action as well as a microwave treatment (2.45 GHz) was analyzed. The combined method consisted of a mechanical treatment of Ni and Al nitrates mixture in a planetary mill and the subsequent burning in a thermal oven was considered as the most effective because it resulted in the practically single product. The microwave treatment took up an intermediate position by the effectiveness. The maximum yield was under using nickel and aluminum nitrates as precursors. Structural characteristics, UV-visible and FTIR spectra, specific surface area, and pore size of NiAl2O4 were analyzed.


Datum: 01.06.2022


Interaction of Low-Molecular Compounds with Nanoclusters: Thermodynamics, Relationship with Dielectric Permittivity and Polarizability of Molecules, Magic Numbers, Research Prospects

Abstract

The enthalpies of interactions of various organic compounds with nanocluster molybdenum-containing polyoxometalates have been studied experimentally. Substances with dielectric permittivity varying within a wide range were chosen. The dependence of enthalpy was found to be sign-variable, with a transition from endothermal to exothermal effects in the range of permittivity 15–17. Similar tendencies with an extremum or inflection at permittivity of 15–17 were found for a number of reference physicochemical parameters (boiling and melting points, enthalpies of these processes, enthalpy of formation, viscosity, heat capacity) of a wide range of organic and some inorganic compounds. The general nature of these tendencies may be a basis for further development of modern concepts about the mechanisms of intermolecular interaction.


Datum: 01.06.2022


Adsorption of Methylene Blue on TiO2/SiO2 Prepared by Chemical Vapor Deposition

Abstract

TiO2/SiO2 was prepared by the chemical vapor deposition followed by characterization using XRD, Raman spectroscopy, UV–Vis spectroscopy and N2-adsorption, respectively. Also, the adsorption of methylene blue (MB) on TiO2/SiO2 was studied including the optimization of adsorption conditions, kinetics, isotherms and thermodynamics which were investigated in detail. TiO2/SiO2 has a characteristic mesoporous pore size of 8.8 nm. More importantly, Ti species in TiO2/SiO2 exist as low coordinated frame Ti, extra frame Ti and even as bulk anatase and rutile. The adsorption ratio can exceed 74% under optimum conditions. The adsorption process is better fitted by both the pseudo-second-order kinetic model and the Langmuir isotherm model. All the thermodynamic parameters of the adsorption including ΔH0, ΔS0, and ΔG0 are negative, indicative of an exothermic system, which is entropy-decreasing and in turn spontaneous. The adsorption mechanism suggests that TiO2/SiO2 performs better than SiO2 in the adsorption of MB resulting from all kinds of Ti species. Especially, Ti species with low coordination in TiO2/SiO2 prepared by the chemical vapor deposition are the prime responsible species for the adsorption of MB because of higher abilities to coordinate N and S atoms from MB ions. Consequently, the chemical vapor deposition of TiCl4 on SiO2 is a promising and prospective technique for preparing novel adsorbents, provided that improvements are employed such as increasing the specific surface area of SiO2 as well as adjusting Ti ion loading and pore structure.


Datum: 01.06.2022


DFT Study of Adsorption of Methyl Red on the Surface of Pure, Pyrrolidine-Functionalized, Silicon- and Germanium-Doped Zigzag (6, 0) Carbon Nanotubes

Abstract

In the present study, the adsorption of methyl red on the surface of pure zigzag (6, 0) carbon nanotube was investigated using the density functional theory calculations. The role of the pyrrolidine functional group, as well as doped-silicon and germanium atoms in the adsorption of the methyl red was investigated. The natural bond orbital and the quantum theory of atoms in molecules calculations were performed for further understand of the intermolecular interactions between methyl red and the studied nanotubes. The values of adsorption energy and its negative sign indicate that the adsorption of methyl red on the functionalized and doped derivatives of zigzag (6, 0) carbon nanotubes is favorable. According to the results, the pyrrolidine functionalized zigzag (6, 0) carbon nanotube, Eads = –0.57 eV, has a better performance for methyl red adsorption.


Datum: 01.06.2022


Thermal Stability and Kinetics of Decomposition of Hydrogen Polyoxides H2O3 and H2O4 in Peroxy Radical Condensates

Abstract

Experimental studies are performed of the kinetics of decomposition of peroxy radical condensates (PRC) under conditions of a rise in temperature according to a linear law and control during the process by measuring the pressure of gaseous products in a constant volume system. An original way of solving the inverse problem of non-isothermal kinetics is proposed that does not require transformation of experimental dependence P(T). Four stages of gas evolution during the decomposition of PRC are discovered, and their temperature intervals and kinetic characteristics are determined. The Raman spectra of peroxy radical condensates (PRC) are analyzed at different temperatures. Based on the results, it is proposed that the stages of decomposition be attributed to the decomposition reactions of hydrogen tetroxide H2O4 and trioxide H2O3. Temperature intervals of stability and kinetic characteristics of decomposition reactions of polyoxides H2O4 and H2O3 in the composition of PRC are established. The quantitative composition of freshly prepared condensates is determined.


Datum: 01.06.2022


Synthesis and Study of a Metal Complex of Neodium and Cefazolin

Abstract

Metal complex [NdCzl3(H2O)3] is obtained and separated in solid form through the interaction between aqueous solutions of trivalent neodymium chloride and the sodium salt of cefazolin. Its composition is determined using results from X-ray spectral electron probe analysis, simultaneous thermal analysis, and IR spectroscopy.


Datum: 01.06.2022


Enriching Feedstock of Functional Food with Nanosized Selenium

Abstract

A study is performed of dispersion processes for obtaining selenium colloidal solutions via laser ablation, an ultrasonic bath, an ultrasonic rod vibration system, and mechanical action in order to determine the effectiveness of using colloidal solutions of nanosized selenium. Means are developed for quantitatively determining concentrations of selenium and inorganic components of plant feedstock through inductively coupled plasma atomic-emission spectrometry (ICP–AES) and atomic absorption spectroscopy (AAS). Analytical parameters are obtained for the determination of elements, and the conditions of spectrometer operation are optimized. The chosen means of sample preparation are stepwise microwave heating in a Mars 5 autoclave system. Matrix interference is revealed, and ways of allowing for it are determined. It is established that using ICP–AES and AAS analysis with complementary analytical techniques allows control of the Se content and mineral composition of the feedstock for functional food—matrix elements (Ca, K, Na, Mg, Al, Si, and Fe), concomitant microelements (Ag, B, Ba, Co, Cu, Mn, Mo, Ni, Sr, and Zn), and toxic elements (As, Be, Bi, Cd, Cr, Li, Pb, Sb, Sn, Ti, V, and W)—in a wide range of concentrations—1 × 10−6 to n × 10%—with no matrix separation or use of certified solid reference samples. It is shown that the proposed means of analytical control can be used to create fundamentally new ways of enriching feedstock for functional food with nanosized selenium.


Datum: 01.06.2022


 


Category: Current Chemistry Research

Last update: 28.03.2018.






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