Autor: Dyachenko, Alla - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Sono-Enhanced Selective Oxidation of Lignin-Based Coniferyl Alcohol in Continuous Flow through a Synergistic Metal Oxide Heterostructure
Autorzy:: Colmenares, Juan Carlos
Djaballah, Ahmed Malek
Bagtache, Radia
Bellardita, Marianna
Łomot, Dariusz
Trari, Mohamed
Dyachenko, Alla
Hashemi Hosseini, Behdokht
Wydawca:: Wiley
Cytata wydawnicza:: Ahmed Malek Djaballah, Behdokht Hashemi Hosseini, Dariusz Łomot, Alla Dyachenko, Radia Bagtache, Marianna Bellardita, Mohamed Trari, Juan Carlos Colmenares , ChemPhotoChem 2025, 0, e202500114. https://doi.org/10.1002/cptc.202500114
Opis:: The selective oxidation of organic substances is today considered one of the greenest strategies to synthesize important starting materials in different technological applications. This study investigates the sono-enhanced selective oxidation of coniferyl alcohol, a lignin-based model compound, under visible light by integrating sono-photocatalysis in a continuous flow system. The process utilizes a CuBi₂O₄/TiO₂ heterostructure as photocatalyst prepared by a simple and low-cost method. The heterostructure demonstrates significant improvements in catalytic performance due to its effective charge separation and extended light absorption range with a conversion and selectivity of 92 % and 46%, 30 % respectively for coniferyl aldehyde and ferulic acid after 4 hours under visible light irradiation by using acetonitrile as solvent. The synergistic combination effects of ultrasonic irradiation and photocatalysis are explored to enhance the efficiency and selectivity of the oxidation reaction with 54% conversion with significant selectivity of ferulic acid measured 65%. Additionally, the continuous flow setup offers advantages in scalability and operational stability, making this method a promising approach for sustainable biomass valorization. The results highlight the potential of combining sonication and photocatalysis to achieve efficient and selective chemical transformations in renewable energy and green chemistry applications, and specially contributes to the sustainable transformation of lignin-based compounds into high-value chemicals, aiding in the utilization of biomass.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 2.

Tytuł:: Structure of aluminosilicate-supported nickel and iron oxides nanocomposites in gaseous and aqueous media
Autorzy:: Goncharuk, Olena
Dyachenko, Alla
Skwarek, Ewa
Ischenko, Olena
Andriyko, Lyudmila
Borysenko, Mykola
Sulym, Iryna
Sternik, Dariusz
Kowalska, Klaudia
Marynin, Andrii
Tematy:: oxide nanocomposites
NiO/FexOy
textural properties
particle size distribution; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2146949.pdf Link otwiera się w nowym oknie
Opis:: A series of mixed oxides was synthesized by deposition of a guest phase on a highly dispersed oxide matrix. Fumed nanooxides SiO2, Al2O3, SiO2/Al2O3, and SiO2/Al2O3/TiO2 with the specific surface area of 65-91 m2/g were selected as highly dispersed matrices. NiO/FexOy was deposited as a guest oxide using solvate-stimulated modification of a surface of fumed nanocarriers with nickel nitrate and iron(III) formate and subsequent heat treatment up to 600 °C to form NiO/FexOy. The aim of this work was to study the influence of the composition and structure of fumed oxide matrices and deposited guest phase on the behavior of the composites in gaseous and aqueous media using XRD, nitrogen adsorption and SEM/EDX, and quasi-elastic light scattering (QELS) methods. The lowtemperature nitrogen adsorption isotherms have a sigmoid shape with a narrow hysteresis loop characteristic of mesoporous materials. The specific surface area of composites varies from 65 to 120 m2/g. SEM data show denser aggregate structure of nanocomposites compared to the initial carriers. The primary particle size was in the 30-60 nm range. According to QELS data, there is a tendency to form aggregates of 100 nm - 10 µm in size in the aqueous media. The XRD method shows that the deposited metal oxides are in the form of crystalline phases of NiO with crystallites of 7-23 nm in size, but the iron oxide reflexes were not identified for NiO-containing composites.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Advanced design of sol-gel derived multilayered cerium titanate films: structural, surface, photoelectrochemical and photocatalytic properties and photocatalytic properties
Autorzy:: Vorobets, Vera
Smirnova, Nataliia
Eremenko, Anna
Linnik, Oksana
Kramar, Anastasiia
Chernyayeva, Olga
Kolbasov, Gennadii
Gaidai, Snizhana
Kyeongjae Cho
Dyachenko, Alla
Ischenko, Olena
Bibik, Yuliia
Współwytwórcy:: Kyeongjae Cho
Wydawca:: ELSEVIER
Opis:: Crystallization of Ce2Ti2O7 in the mixture of TiO2 and CeO2 has been achieved by the three-layered coating of cerium - titanium mixed sol of the 1 : 1 metal molar ratio on a glass substrate after thermal treatment of interlayers at 300°C or 600°C and the last layer at 450°C or 600°C in the air as proven by XRD, SAED and Raman spectroscopy. The monoclinic and its mixture with pyrochlore crystal structures are formed in the case of the last layer heating at 450°C and 600°C, respectively. It is shown that Ce ions retarded TiO2 crystallization, leading to the increase in the specific surface area of some films that, in turn, depends on the calcination temperature. The formation of Ti-O Ce bonds on the surface of the films was proven by the noticeable shift of Ti2p and O1s XPS maxima compared to TiO2 ones. The additional peaks in Ti2p, O1s and Ce3d XPS spectra belonging to the common bonds between the metal ions are identified for the first time. The preferential formation of Ti-O-Ce fragments at the treatment of all layers at 600°C is noted. The bandgap energy and band-edge positions of Ce2Ti2O7 were firstly determined by photoelectrochemical measurements. The inactivity of the films in photocatalytic reductive and oxidative processes is caused by the unfavorable position of the valence band causing the recombination of the photoformed electron-hole pair.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 4.

Tytuł:: The analysis of structure-anticancer and antiviral activity relationships for macrocyclic pyridinophanes and their analogues on the basis of 4D QSAR models (simplex representation of molecular structure).
Autorzy:: Kuz'min, Victor
Artemenko, Anatoly
Lozitsky, Victor
Muratov, Eugene
Fedtchouk, Alla
Dyachenko, Natalia
Nosach, Lidiya
Gridina, Tatiyana
Shitikova, Larisa
Mudrik, Liubov
Mescheriakov, Aleksey
Chelombitko, Vladislav
Zheltvay, Andrey
Vanden Eynde, Jean-Jaques
Tematy:: macrocyclic pyridinophanes
anticancer and antiviral activity
4D QSAR; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1043822.pdf Link otwiera się w nowym oknie
Opis:: A new 4D-QSAR approach has been considered. For all investigated molecules the 3D structural models have been created and the set of conformers (fourth dimension) have been used. Each conformer is represented as a system of different simplexes (tetratomic fragments of fixed structure, chirality and symmetry). The investigation of influence of molecular structure of macrocyclic pyridinophanes, their analogues and certain other compounds on anticancer and antiviral (anti-influenza, antiherpes and antiadenovirus) activity has been carried out by means of the 4D-QSAR. Statistic characteristics for QSAR of PLS (partial least squares) models are satisfactory (R = 0.92-0.97; CVR = 0.63-0.83). Molecular fragments increasing and decreasing biological activity were defined. This information may be useful for design and direct synthesis of novel anticancer and antiviral agents.
Dostawca treści:: Biblioteka Nauki

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