Evgeny V. Suleimanov

Bio: Evgeny V. Suleimanov is an academic researcher. The author has contributed to research in topics: Photocatalysis & Radical polymerization. The author has an hindex of 1, co-authored 3 publications receiving 1 citations.

Pyrochlore oxides as visible light-responsive photocatalysts

Abstract: Heterogeneous photocatalysis has been considered as one of the most attractive alternative routes to transform naturally abundant, clean, and sustainable solar energy into chemical energy. Considering efficient solar-energy utilisation, the development of new materials that are sensitive to visible light is an important direction in the theory and practice of heterogeneous photocatalysis. In recent years, many efforts have been focused on the development of pyrochlore oxides as visible light-responsive photocatalysts for the degradation of dyes, water splitting, and CO2 reduction. The interest in pyrochlores is attributed to their compositional flexibility to manipulate the electron/hole mobility by introducing a wide range of elements into their structure. The present perspective reports the progress over the last 5 years in the use of pyrochlore-like oxides as promising photocatalysts for various applications. A special focus of this perspective is on the strategies for the enhancement of the photocatalytic activity of pyrochlores, namely optimisation of their preparation method, band gap engineering, incorporation of plasmonic metals, and creation of heterojunctions.

Features of Polymerization of Methyl Methacrylate using a Photocatalyst—the Complex Oxide RbTe1.5W0.5O6

Abstract: Radical polymerization of methyl methacrylate in an aqueous emulsion was carried out using the complex oxide RbTe15W05O6 as a photoinitiator under visible light irradiation with λ = 400–700 nm Study of the polymerization process and reaction products using methods of physical and chemical analysis (GPC, IR, NMR, etc) has shown that there are several directions of monomer transformations at the same time Polymethyl methacrylate with Mn ~ 140–145 kDa, produced in the organic phase, is a result of polymerization initiation by a hydroxyl radical formed due to complex transformations of electron–hole pairs during photocatalyst irradiation Moreover, the interaction of the hydroxyl radical with OH-groups on the complex oxide RbTe15W05O6 surface and the subsequent formation of oxygen-centered radicals lead to grafting polymer macromolecules on the photocatalyst surface In addition, methyl methacrylate is able to oxidize to a cyclic dimer with terminal double bonds and form a polymer with cyclic dimer links due to coordination by double bonds on the RbTe15W05O6 surface The high activity of the hydroxyl radical allows to obtain the graft copolymer PMMA-pectin by grafting the polymer product on the surface of the natural polymer-pectin Comparison of the sponge morphology of the graft copolymer PMMA-pectin and the initial pectin samples using the scanning electron microscopy has shown a noticeable difference in their structural and topological organization It is especially interesting in terms of studying the properties of the graft copolymer as a material for the scaffolds

Metal–organic framework‐based heterojunction photocatalysts for organic pollutant degradation: design, construction, and performances

Abstract: Heterogeneous photocatalysis has been considered one of the most attractive alternative routes to transforming naturally abundant, clean, and sustainable solar energy into chemical energy. Nowadays, the most popular heterogeneous photocatalyst, titanium dioxide, has already found applications for water splitting to produce hydrogen and oxygen, for the degradation of organic pollutants, for air purification, and for the creation of self-cleaning coatings. However, TiO2 has a significant limitation: a large band gap (3.0–3.4 eV) that makes it impossible to use anything other than ultraviolet illumination to initiate photocatalytic processes. With a focus on efficient solar-energy utilization, the development of new photocatalysts that are sensitive to visible light is an important direction in the theory and practice of heterogeneous photocatalysis. In this regard, the use of metal–organic frameworks (MOFs) is an attractive route; they have emerged as an interesting class of materials for applications in photoreactions due to their flexible tunability in composition, structure, and functional properties, along with their facilitated adsorption towards chemicals and their efficient light absorption. Moreover, they can be composed with other semiconductors to produce heterojunctions (e.g., type-II, Z-scheme, and S-scheme), whose effectiveness in photogenerated charge separation has already been proven by many examples. The present critical review reports progress over the last 5 years in the preparation and activity of metal–organic framework-based heterojunction photocatalysts for the degradation of organic pollutants. © 2022 Society of Chemical Industry (SCI).

Pyrochlore oxides as visible light-responsive photocatalysts

Abstract: Heterogeneous photocatalysis has been considered as one of the most attractive alternative routes to transform naturally abundant, clean, and sustainable solar energy into chemical energy. Considering efficient solar-energy utilisation, the development of new materials that are sensitive to visible light is an important direction in the theory and practice of heterogeneous photocatalysis. In recent years, many efforts have been focused on the development of pyrochlore oxides as visible light-responsive photocatalysts for the degradation of dyes, water splitting, and CO2 reduction. The interest in pyrochlores is attributed to their compositional flexibility to manipulate the electron/hole mobility by introducing a wide range of elements into their structure. The present perspective reports the progress over the last 5 years in the use of pyrochlore-like oxides as promising photocatalysts for various applications. A special focus of this perspective is on the strategies for the enhancement of the photocatalytic activity of pyrochlores, namely optimisation of their preparation method, band gap engineering, incorporation of plasmonic metals, and creation of heterojunctions.

An Unprecedented 2-fold Interpenetrated lvt Open Framework Built from Zn6 Ring Seamed Trivacant Polyoxotungstates Used for Photocatalytic Synthesis of Pyridine Derivatives

Abstract: Solar-driven straightforward one-step synthesis of pyridine derivatives in the absence of photosensitizer is of considerable interest but greatly challenging in synthetic and medicinal chemistry. Herein, an unprecedented 2-fold interpenetrated lvt polyoxometalate-based open framework (POM-OF), LCU-22 ([Zn(1-ipIM) 3 ] 2 [Zn 6 (AsW 9 O 33 ) 2 (1-ipIM) 6 ]·2(1-HipIM), 1-ipIM = 1-isopropyl imidazole) has been synthesized in gram-scale quantities using a one-pot reaction and structurally characterized by X-ray crystallography. The cluster node in LCU-22 is a Zn 6 ring seamed trivacant polyoxotungstate cluster ([Zn 6 (AsW 9 O 33 ) 2 ]), which is quadruply extended by [Zn(1-ipIM) 3 ] 2+ units to form the final 3D open framework. Remarkably, LCU-22 is highly stable over wide pH range and in various solvents, and dramatically boosted the white light-powered heterogeneous photocatalysis for synthesis of pyridine derivatives in good yields after three times recycles utilization. This work not only build a novel POM-OF but also underscores the unique advantages of transition metal cluster substituted polyoxotungstates frameworks used for selective photocatalytic formation of value-added organic molecules. • The one-pot gram-scale synthetic strategy has been reported for 2-fold interpenetrated lvt LCU-22 . • LCU-22 is highly stable over wide pH range and in various solvents • LCU-22 boosted the visible-light-driven heterogeneous photocatalysis for one-step synthesis of pyridine derivatives. • The catalysis mechanism of the photocatalyst has been intensively discussed and revealed.

Phenothiazine-based covalent organic frameworks with low exciton binding energies for photocatalysis

Abstract: Designing delocalized excitons with low binding energy (Eb) in organic semiconductors is urgently required for efficient photochemistry because the excitons in most organic materials are localized with a high Eb of >300 meV. In this work, we report the achievement of a low Eb of ∼50 meV by constructing phenothiazine-based covalent organic frameworks (COFs) with inherent crystallinity, porosity, chemical robustness, and feasibility of bandgap engineering. The low Eb facilitates effective exciton dissociation and thus promotes photocatalysis by using these COFs. As a demonstration, we subject these COFs to photocatalytic polymerization to synthesize polymers with remarkably high molecular weight without any requirement of the metal catalyst. Our results can facilitate the rational design of porous materials with low Eb for efficient photocatalysis.