Article
Chemistry, Physical
Alejandra Romero-Moran, Jose L. Sanchez-Salas, Joel Molina-Reyes
Summary: The study established the influence of the crystalline phase and agglomeration degree of TiO2 nanoparticles on photocatalytic hydroxyl radical formation and bacterial inactivation in TiO2/SiO2 composite coatings. A relationship between hydroxyl radicals' formation and charge carrier transfer mechanism between defect levels in SiO2 and TiO2 embedded nanoparticles was established through a simple spectroscopic method. This correlation complements the lack of mechanisms behind the photocatalytic activity in TiO2/SiO2 composites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Biochemistry & Molecular Biology
Mairis Iesalnieks, Raivis Eglitis, Talis Juhna, Krisjanis Smits, Andris Sutka
Summary: This study successfully prepared a transparent titanium dioxide coating on plastic substrates and demonstrated its high performance in photocatalytic degradation of organic pollutants. The coating can be applied to polymer substrates and exhibits good stability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Min Huang, Shuyi Zhang, Bo Wu, Xing Yu, Yongping Gan, Tiejun Lin, Fei Yu, Yuhan Sun, Liangshu Zhong
Summary: A tunable band structure W-doped TiO2 photocatalyst was designed for the photocatalytic oxidation of methane to C-1 oxygenates using O-2 at low temperature. The W-doping improved the photocatalytic performance, achieving a liquid oxygenates productivity of 12.2 mmol g(-1) and a selectivity of 99.4%. Additionally, the selectivity of COx was effectively decreased from 21.2% to 0.6%. W-doping not only enhanced light absorption but also promoted the separation of photo-generated carriers, improving methane conversion.
Review
Environmental Sciences
S. Akash, Baskaran Sivaprakash, Natarajan Rajamohan, C. Muruga Pandiyan, Dai-Viet N. Vo
Summary: The excessive and unorganised utilisation of pesticides have negative impacts on soil and water. Photocatalytic method using nanomaterials shows potential as an alternative for the removal of pesticide pollutants. Specially synthesised nanoparticles have been found to be effective in the photocatalytic treatment of pesticides.
Article
Biochemistry & Molecular Biology
Paulina Rokicka-Konieczna, Agata Markowska-Szczupak, Ewelina Kusiak-Nejman, Antoni W. Morawski
Summary: This study presents the characteristics of saccharose-modified TiO2 photocatalysts obtained through a low-temperature hydrothermal method. The influence of these photocatalysts on the survivability and enzyme activity of Escherichia coli and Staphylococcus epidermidis under UV-A and artificial solar light was examined. The TiO2-1%-S-100 photocatalysts were capable of achieving complete inactivation of the bacteria under artificial solar light irradiation in less than 1 hour. The study also discusses the impacts of sugars on the photocatalytic activity and disinfection performance.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Materials Science, Coatings & Films
M. Coto, S. C. Troughton, P. Knight, R. Joshi, R. Francis, R. Kumar, T. W. Clyne
Summary: UV treatments are commonly used for pollutant removal in industrial water. Introducing a suitable photocatalyst can enhance energy efficiency by producing reactive oxygen species to degrade pollutants. TiO2 is a common photocatalyst for UV illumination, often created through Plasma Electrolytic Oxidation (PEO) of titanium substrates. High surface roughness and area on PEO samples enhance photocatalytic activity by disrupting fluid flow and increasing interaction between pollutants and the catalytic surface.
SURFACE & COATINGS TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Belen Vaz, Moises Perez-Lorenzo
Summary: Porphyrins have been widely used as photosensitizers in the field of photovoltaics and photocatalysis due to their ability to transfer energy from light-collecting areas to reaction centers, similar to natural photosynthesis. However, while solar cell development has led to continuous improvement in the molecular design of these pigments, these innovations have not been efficiently applied to dye-sensitized photocatalysis. This review aims to explore recent advances in the role of porphyrin structural motifs as sensitizers in TiO2-mediated catalysis, providing valuable insights for the development of more efficient photocatalysts.
Article
Chemistry, Multidisciplinary
Valentin G. Bessergenev, Jose F. Mariano, Maria Conceicao Mateus, Joao P. Lourenco, Adwaa Ahmed, Martin Hantusch, Eberhard Burkel, Ana Maria Botelho do Rego
Summary: The dielectric properties and spectral dependence of the photocatalytic constant of Co doped P25 Degussa powder were studied. The research showed a concentration limit for cobalt distribution in the TiO2 matrix before metallic clusters form, and the formation of CoTiO3 phases during annealing at high temperatures. The temperature dependence of the dielectric constant indicated relaxation processes at temperatures below 400 degrees C and Ti-O octahedron reorientation at higher temperatures. The spectral dependency of the photocatalytic constant revealed the presence of electronic states within the energy gap of TiO2 for all nanopowdered samples.
Article
Chemistry, Multidisciplinary
Joanna Musial, Artium Belet, Dariusz T. Mlynarczyk, Michal Kryjewski, Tomasz Goslinski, Stephanie D. Lambert, Dirk Poelman, Beata J. Stanisz
Summary: In this study, composites based on TiO2 and metallophthalocyanines were prepared, characterized and tested for photoactivity. The composites showed lower band-gap energy and higher photocatalytic activity compared to commercial TiO2 P25 or unsubstituted zinc(II) phthalocyanine-grafted TiO2. Chemical deposition was found to be a simple and efficient method for modifying TiO2 surface with phthalocyanines.
Article
Chemistry, Multidisciplinary
Vytautas Kavaliunas, Paulius Ceplikas, Mantas Sriubas, Giedrius Laukaitis
Summary: The study investigates the formation of Ag nanoparticles on the surface of TiO2 to enhance photocatalytic efficiency. The optimal annealing temperature and time were chosen to form Ag nanoparticles, and the results demonstrated that Ag nanoparticles can enhance the photocatalytic efficiency of TiO2 thin films.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Applied
Sergio Belda-Marco, Maria Angeles Lillo-Rodenas, Maria Carmen Roman-Martinez
Summary: TiO2-Cu photocatalysts containing different copper species were used for the photoreforming of cellulose in water at room temperature with UV light. Copper was found to have a positive effect, with a mixture of Cu(I) and Cu(II) species favoring the process. Among the catalysts, the one prepared by simple impregnation without heat treatment showed the highest hydrogen production.
Article
Chemistry, Physical
Min Huang, Shuyi Zhang, Bo Wu, Yao Wei, Xing Yu, Yongping Gan, Tiejun Lin, Fei Yu, Fanfei Sun, Zheng Jiang, Liangshu Zhong
Summary: In this study, a novel Cu and W codoped TiO2 photocatalyst was fabricated to achieve selective photooxidation of methane into oxygenates at ambient temperature, with limited formation of CO2. The Cu-W-TiO2 photocatalyst exhibited high productivity and selectivity, and its improved performance was attributed to the modulation of electronic and band structure, which facilitated methane activation and hindered overoxidation of oxygenates.
Article
Nanoscience & Nanotechnology
Patrick Hartwich, Christian Pritzel, Manuela S. Killian
Summary: This study proposes an alternative utilization of titanium dioxide by covering surfaces of cement-based materials with a regular-shaped monolayer of photocatalytically active titanium dioxide nanotube arrays. The study also presents a proposal for the synthesis of TiO2 nanotubes and transferring them onto material surfaces, providing the opportunity for applying the material to precast elements.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Environmental
Mingizem Gashaw Seid, Aseom Son, Kangwoo Cho, Jeehye Byun, Seok Won Hong
Summary: This study aimed to investigate the structural effect of engineered TiO2 samples on the formation of major nitrosamines during photocatalysis. The nitrogen-containing impurities and leached metal ions from doped-TiO2 samples could exacerbate nitrosamine formation potential. Pre-purification and immobilization of doped-TiO2 samples are suggested to remove a considerable amount of nitrosamines.
Article
Engineering, Environmental
Michal Baudys, Rachel Andrews, Ri Han, Christopher O'Rourke, Stephanie Hodgen, Josef Krysa, Andrew Mills
Summary: Three commercial exterior photocatalytic paints and one In-house paint were tested using NO ISO method, showing little or no photocatalytic activity without weathering. Different paints require different weathering conditions for activation, with the STO paint showing fast and durable activation through condensation-only weathering. The presence of surface HNO3 affects the NOx removal activity of all paints towards the end of the irradiation period.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Materials Science, Ceramics
Sergei A. Kurnosenko, Vladimir V. Voytovich, Oleg Silyukov, Iana A. Minich, Ekaterina N. Malygina, Irina A. Zvereva
Summary: Protonated Ruddlesden-Popper phases HLnTiO(4) (Ln = La, Nd) have been used to synthesize inorganic-organic derivatives with intercalated n-alkylamines and covalently grafted n-alkoxy groups. The presence of organic components expands the interlayer space of the titanates, forming a paraffin-like bilayer structure with a large tilting angle. The organic modification does not affect the light absorption of the samples in the near-ultraviolet and visible regions. The thermal stability of the derivatives depends on the bonding nature of the organic components, with covalent alkoxy derivatives exhibiting better stability.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Sergei A. Kurnosenko, Vladimir V. Voytovich, Oleg I. Silyukov, Ivan A. Rodionov, Irina A. Zvereva
Summary: This study focuses on the photoinduced hydrogen evolution from aqueous D-glucose and D-xylose using layered perovskite-like oxides and their organically modified derivatives. The research reveals that the organically modified derivatives show significantly higher activity compared to the unmodified materials, with an apparent quantum efficiency of 8.8%. Additionally, the study demonstrates the importance of the oxides' interlayer space in the overall photocatalytic activity for hydrogen production.
Article
Physics, Atomic, Molecular & Chemical
Marina G. Shelyapina, Anton Mazur, Rosario Yocupicio-Gaxiola, Uriel Caudillo-Flores, Andrea Urtaza, Ivan A. Rodionov, Irina A. Zvereva, Vitalii Petranovskii
Summary: New TiO2/2D mordenite nanocomposites were synthesized by introducing titanium tetraetoxide into the interlamellar space of lamellar mordenite, followed by hydrolysis and calcination. The nanocomposites exhibited mesoporosity and contained anatase nanoparticles as pillars between mordenite layers. The surface area, pore size distribution, and total pore volume of the nanocomposites were influenced by the hydrolysis medium. The removal of organic cations during preparation led to a partial collapse of the local mordenite structure. This study provides insights into the use of TiO2/2D mordenite nanocomposites for water purification.
APPLIED MAGNETIC RESONANCE
(2022)
Article
Chemistry, Physical
Elizaveta M. Borodina, Liliya V. Yafarova, Tatiana A. Kryuchkova, Tatiana F. Sheshko, Alexander G. Cherednichenko, Irina A. Zvereva
Summary: The effect of cobalt substitution on the selective hydrogenation of CO in the GdFeO3 perovskite structure was studied. A series of GdCoxFe1-xO3 (x = 0; 0.2; 0.5; 0.8; 1) samples were synthesized and characterized. The data revealed correlations between the state of iron and cobalt atoms, fractions of surface and lattice oxygen, and catalytic characteristics.
Article
Chemistry, Physical
Ivan A. Rodionov, Ekaterina O. Gruzdeva, Anton S. Mazur, Sergei A. Kurnosenko, Oleg I. Silyukov, Irina A. Zvereva
Summary: The stability of platinized n-butylamine-intercalated layered titanate H2La2Ti3O10 during the process of photocatalytic hydrogen production from aqueous methanol has been thoroughly investigated. The results show that n-butylamine transforms into n-butyraldehyde within 3 hours of the reaction, while the particle morphology and specific surface area of the photocatalyst are preserved. The activity of the photocatalyst is stable and strongly depends on the medium pH.
Article
Materials Science, Ceramics
S. A. Kurnosenko, A. A. Burov, O. I. Silyukov, V. V. Voytovich, I. A. Zvereva
Summary: Layered perovskite-like niobates APb(2)Nb(3)O(10) (A = Rb, Cs) were synthesized by the ceramic method. The oxides showed resistance to protonation and hydration in water. Acid treatment of the oxides yielded protonated hydrated forms H(x)A(1 - x)Pb(2)Nb(3)O(10)center dot yH(2)O. The propensity of the samples to protonation depended on the A(+) cation, with the Rb-containing niobate capable of complete protonation while the Cs-containing counterpart required multiple acid treatments. Protonated niobates showed enhanced thermal stability towards interlayer dehydration after aqueous treatment under hydrothermal conditions.
GLASS PHYSICS AND CHEMISTRY
(2023)
Article
Materials Science, Ceramics
S. I. Niftaliev, I. V. Kuznetsova, I. A. Zvereva, L. V. Lygina, A. A. Sinelnikov, I. A. Saranov, K. B. Kim, S. S. Chernenko
Summary: SiO2, Gd2O3-SiO2, and Eu2O3-SiO2 were synthesized using silicon oxide isolated from kaolin and silicon oxide obtained by hydrolysis of tetraethoxysilane. Agar-agar was added as a structure-forming agent and freeze-drying was used to obtain powders. The calcined powders are X-ray amorphous. The morphology of the samples was studied using TEM and DLS. The nanoparticles obtained from tetraethoxysilane have a smaller particle size and weaker agglomerates compared to those synthesized from kaolin. Different luminescence excitation spectra were observed for the Eu2O3-SiO2 samples synthesized using different methods.
GLASS PHYSICS AND CHEMISTRY
(2023)
Review
Biochemistry & Molecular Biology
Alexandra Golikova, Anna Shasherina, Yuri Anufrikov, Georgii Misikov, Maria Toikka, Irina Zvereva, Alexander Toikka
Summary: The molar excess enthalpies (H-m(E)) for three binary mixtures (acetic acid + n-butanol, acetic acid + n-butyl acetate, and n-butanol + n-butyl acetate) at 313.15 K and atmospheric pressure were obtained using Setaram's C80 isothermal mixing calorimeter. The data was correlated using the NRTL model and Redlich-Kister equation. Comparative analysis was conducted with literature data on all available binary subsystems of the quaternary system. Other thermodynamic properties (C-p,m(E), S-m(E), ?S-mix(m), G(m)(E), and ?(mix)G(m)) were estimated using literature data and classical thermodynamics formulas.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Alina D. Khramova, Oleg I. Silyukov, Sergei A. Kurnosenko, Ekaterina N. Malygina, Irina A. Zvereva
Summary: A protonated and hydrated Dion-Jacobson-phase HSr2Nb3O10 & BULL;yH(2)O was used as a precursor to prepare inorganic-organic derivatives with non-covalently intercalated n-alkylamines and covalently grafted n-alkoxy groups. These hybrid materials showed potential for photocatalytic applications. The structure, composition, bonding, and light absorption of the derivatives were characterized using various spectroscopic and analytical techniques. The results indicated that the hybrids contained one interlayer organic molecule or group per proton of the initial niobate and also some intercalated water. The thermal stability of the compounds depended on the nature of the organic component, with covalent alkoxy derivatives being more stable than non-covalent amine derivatives.
Article
Chemistry, Physical
Alexander Kazantsev, Ivan A. Rodionov, Olga Bakulina, Grigory Kantin, Dmitry Dar'in, Mikhail Krasavin
Summary: The ratio of the products obtained from the reaction between E-3-Arylidene-4-diazopyrrolidine-2,5-diones and tetrahydrofuran mediated by rhodium carbenes was found to be dependent on the catalyst loading. By adjusting the catalyst loading, either of the two products can be obtained in good yields. Mechanistic and kinetic interpretation of this phenomenon has been proposed.
Article
Chemistry, Physical
Sergei A. Kurnosenko, Vladimir V. Voytovich, Oleg I. Silyukov, Ivan A. Rodionov, Irina A. Zvereva
Summary: Two series of hybrid inorganic-organic materials were prepared by modifying HLnTiO(4) (Ln = La, Nd), resulting in more efficient photocatalytic materials that were up to 68 and 29 times superior in activity compared to unmodified compounds and a reference photocatalyst, respectively. The hydrogen evolution rate of the samples correlated with interlayer hydration, and HLnTiO(4)-based samples displayed increased stability compared to related H(2)Ln(2)Ti(3)O(10)-based hybrid materials.
Article
Chemistry, Physical
Sergei A. Kurnosenko, Vladimir V. Voytovich, Oleg I. Silyukov, Ivan A. Rodionov, Ekaterina N. Malygina, Irina A. Zvereva
Summary: The photocatalytic activity of HB2Nb3O10 perovskite nanosheets (B = Ca, Sr) was studied in different preparation methods. The filtered nanosheets showed the highest activity, potentially due to the presence of tetrabutylammonium cations on their surface. Additionally, the filtered nanosheets were easier to disperse and had a larger active surface area in the reaction suspension.
Article
Chemistry, Multidisciplinary
Daria N. Shvalyuk, Marina G. Shelyapina, Irina A. Zvereva
Summary: In this study, the electronic structures of dehydrated and hydrated phases of K2La2Ti3O10 were investigated using a density functional theory approach. It was found that the water induced phase transformation from I4/mmm to P4/mmm occurs in two steps. The band structure calculations showed that K2La2Ti3O10 exhibits an indirect band gap of 3.1 eV and has the ability to catalyze the oxidation of water or pollutants as well as reduce H+ to H2. However, the inadequate separation of charge carriers limits its photocatalytic performance.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Physical
Tatiana F. Sheshko, Elizaveta M. Borodina, Liliya V. Yafarova, Ekaterina B. Markova, Tatiana A. Kryuchkova, Alexander G. Cherednichenko, Irina A. Zvereva, Alexander O. Terent'ev
Summary: The effect of strontium substitution in the structure of Gd2SrFe2O7 on the production of light olefins by CO hydrogenation was investigated. The experimental results showed that an increase in Sr2+ content led to higher surface basicity and oxygen diffusion rate, facilitating CO dissociative adsorption and reaction with atomic hydrogen.
