Abstract A theoretical analysis is performed of the topology of the liquidus in the NaBr–Na2CO3–Na2SO4, KBr–K2CO3–K2SO4 systems. The coordinates of minimum point on the monovariant curve in the NaBr–Na2CO3–Na2SO4 system are calculated using the Martynova–Susarev approach. An experimental design is devised for studying systems via differential thermal analysis. The melting point and composition of the

Abstract Infrared spectra are obtained for the disperse phase of initial and mechanoactivated hydrosols of colloidal silica and binary systems with an oligoacrylate dispersion (10 wt %). Changes in the absorption bands characterizing the state of the functional groups of the considered substances are analyzed. A conclusion is drawn about interactions that occur according to the mechanism of physical

Abstract Temperature dependences of the spectra of aqueous solutions of LiCl, KCl, RbCl, CsCl with concentrations of 3 M in the mid-IR range in the temperature range of 39 to 2°C are studied. Average rate \(\frac{{\Delta \nu }}{{\Delta T}}\) of the temperature shift of the wavenumber of the maximum of absorption bands of valence (ν1, 2ν2, ν3), composite ν2 + νL, and deformation ν2 vibrations of the

Abstract The coreduction of Fe(III), MoO\(_{4}^{{2 - }}\), and WO\(_{4}^{{2 - }}\) ions in chloride-containing aqueous solutions in the presence of 2-hydroxypropane-1,2,3-tricarboxylic acid on disperse aluminum suspended in the solution was studied. It was shown that the coprecipitation of molybdenum, tungsten and elemental iron proceeds during the reduction process; it was estimated that the precipitation

Abstract The possibility of adsorption of polluting gases (nitrogen dioxide, methane, ammonia, sulfur dioxide, hydrogen sulfide, ozone, carbon monoxide, carbon monoxide, chlorine) on the surface of iron-containing PAN was evaluated. A model of an iron-containing PAN cluster has been built. The method of molecular modeling was used to determine the thermodynamic parameters of systems: Fe-PAN cluster–gas

Ultrathin films of InSe are obtained via the thermal evaporation of indium selenide in a vacuum. The results from EDS and EDX analysis are given, and it is seen that the obtained film is indium selenide. It is shown that the energy of exciton bonding in ultrathin InSe films grown on the surface of a liquid is 300 meV.

Abstract A new way of diffractometrically measuring the degree of crystallinity of substances by determining the rate of change in function I = f(2θ) over the range of scattering angles of a test sample’s diffractogram is used to study changes in the crystallinity of wheat straw during ozone treatment. It is shown that the crystallinity of a sample is inversely proportional to its content of lignin

Abstract An algorithm and programs are developed for optimizing the experimental study of isobaric–isothermal phase diagrams of quaternary systems with constant-composition phases or phases with narrow homogeneity range. These include (a) a program for enumerating phase diagrams with phases of specified composition and (b) an algorithm and a program software for the iterative analysis of phase diagrams

Abstract The distribution coefficients for 60 elements on the anion-exchange resin Dowex 1x8 in ammonium acetate medium (0.1–5.0 M) are determined. The values of Kd are presented as a periodic table of the elements. A range of possibilities for separating the elements of this system is proposed.

Abstract Fe–Cu bimetallic oxide nanoparticles supported on silica gel that catalyze the hydrogenation of nitrobenzene to aniline and of dinitrobenzenes to phenylenediamines under relatively mild reaction conditions (200°C, \({{p}_{{{{{\text{H}}}_{2}}}}}\) 1.3 MPa, 4 h, and 700 rpm) are synthesized. The catalytic properties of supported bimetallic Fe–Cu catalysts depend on the synthesis procedure, sample

Abstract The FeS nanoparticles have been synthesized from thioacetamide and ferric chloride by hydrothermal method, and the as-prepared nanoparticles have been characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry and AC impedance spectrometry. Electrochemical reduction of 2,4-dinitrochlorobenzene at nano FeS-modified glassy carbon electrode is investigated

Abstract Novel single-phase white-light-emitting Ca2La3(SiO4)2(PO4)O:Dy3+ (CLSPO:Dy3+) phosphors for light-emitting diode (LED) applications were synthesized by conventional solid-state reactions. The phases and luminescent properties of the obtained CLSPO:Dy3+ phosphors were well characterized. The results show that the excited bands of CLSPO:Dy3+ phosphor centered at wavelengths of 324 nm (6H15/2 →

Abstract The presence of dimethylacetamide (DMAA) in the composition of electrolytes of a sodium-ion battery destroys the passive film on electrodes and results in a number of reactions not connected with the electrochemical process that must be considered in developing such batteries. Introducing DMAA into the composition of a battery electrolyte greatly improves the conductivity of the polymeric

Abstract Kinetic features of the interaction between thiocompounds differing in functional groups with triangular silver nanoplates in an aqueous solution are studied. Such interaction results in the aggregation of nanoplates, accompanied by a change in the absorption spectra of their solutions. The behavior of the systems is characterized using kinetic models of the zero–third order. Constants of

Abstract Patterns of the static sorption of anthocyanins on bentonite clay are determined. It is found that the approach used for static sorption is an alternative to dynamic solid phase purification on DIAPAK C18 concentrating cartridges. A way of determining the relative sorption capacity of anthocyanins characterized by different structures on bentonite clay using the Langmuir equation is proposed

Abstract Characteristic features of the gas chromatographic separation of the keto and enol tautomeric forms of ethyl acetoacetate on a capillary column with a BPX-1 standard nonpolar polydimethylsiloxane stationary phase are considered. It is confirmed that the chromatograms of a mixture of tautomers have a specific profile, i.e., a plateau between the peaks of the tautomers, which corresponds to

Abstract Graphitized carbon black, modified by 0.95% adenine, is selected as the main object of study. The thermodynamic characteristics of adsorption of a series of organic compounds on modified carbon black is investigated by inverse gas chromatography. Analysis of the resulting data shows that the additivity of molar changes in the internal energy of adsorption is violated in the considered sample

Abstract Using universal approaches to systematizing the main kinds of chemical bonds of elements and compounds based on them, we review attempts to solve this problem. The theoretical and practical importance of considering metallicity in the homo- and heteronuclear bonds of elements is substantiated in the context of both supplementing any type of chemical interaction between elements with this bond

Abstract Bi/Bi2O2SiO3/Bi2WO6 composite photocatalysts were synthesized via a simple reduction method with using ethylene glycol (EG) as reducing agent. Compared to the pure semiconductor, Bi/Bi2O2SiO3/Bi2WO6 showed the highest photoactivity in degradation of rhodamine B (RhB) and ciprofloxacin (CIP) under visible light. The enhanced phtocatalytic performance can be primarily attributed to the improved

Abstract The interaction between zinc oxide cluster (ZnO)3 in both pure and hydrated forms with mercury ion (HgOH+) has been investigated by using density functional theory (DFT) approach at the GGA-PBE/DZVP level of theory and climbing image – nudged elastic band (CI-NEB) method. The Fukui indices were used to predict the reactivity of the atoms. The adsorption energies were calculated. The results