Pub Date : 2024-07-31DOI: 10.1134/s0036023624600485
Sh. A. Begimkulova, A. M. Nasimov, O. N. Ruzimuradov, V. G. Prozorovich, A. I. Ivanets
Abstract
Lithium manganese oxides with a spinel structure LiMgxMn(2 –x)O4 doped with Mg2+ ions in the range 0 ≤ x ≤ 0.7, were obtained by sol-gel synthesis. Phase composition and morphology of obtained oxides were studied by X-ray powder diffraction and scanning electron microscopy. It is shown, that in the studied range 0 ≤ x ≤ 0.7 Mg-doped lithium manganese oxides saved the structure of the original cubic spinel LiMn2O4, while an increase in parameter a was observed from 8.175 to 8.309 Å and average crystallite size practically unchanged (30–36 nm). Samples of the initial LiMn2O4 spinel and Mg-doped spinel consisted of prismatic particles of submicron (0.1–0.2 µm) and micron (1.0–3.0 µm) sizes, respectively. The effect of the adsorbent dose (0.05–0.3 g/L) and pH (3.0–13.0) of the solution on the adsorption efficiency was studied. The adsorption isotherms of samples LiMg0.3Mn1.7O4 were described by the Langmuir monomolecular adsorption equation. An increase in the temperature of the model solution from 25 to 45°C was accompanied by an increase in the maximum adsorption of the LiMg0.3Mn1.7O4 samples from 10.50 to 10.98 mmol/g, which indicates the endothermic nature of the adsorption process. The kinetics of adsorption was well described by a pseudo-second order equation, which indicates the occurrence of chemical interaction during the adsorption process.
摘要 通过溶胶-凝胶合成法获得了掺杂有 Mg2+ 离子的尖晶石结构 LiMgxMn(2 - x)O4 锂锰氧化物，其掺杂范围为 0 ≤ x ≤ 0.7。通过 X 射线粉末衍射和扫描电子显微镜研究了所得氧化物的相组成和形态。结果表明，在 0 ≤ x ≤ 0.7 的研究范围内，掺杂镁的锰酸锂氧化物保留了原始立方尖晶石锰酸锂的结构，而参数 a 则从 8.175 Å 增加到 8.309 Å，平均结晶尺寸几乎没有变化（30-36 nm）。最初的锰酸锂尖晶石和掺镁尖晶石样品分别由亚微米（0.1-0.2 微米）和微米（1.0-3.0 微米）大小的棱柱形颗粒组成。研究了吸附剂剂量（0.05-0.3 g/L）和溶液 pH 值（3.0-13.0）对吸附效率的影响。样品 LiMg0.3Mn1.7O4 的吸附等温线由 Langmuir 单分子吸附方程描述。随着模型溶液温度从 25°C 升高到 45°C，锰酸锂样品的最大吸附量从 10.50 mmol/g 增加到 10.98 mmol/g，这表明吸附过程具有内热性质。吸附动力学用假二阶方程进行了很好的描述，这表明在吸附过程中发生了化学作用。
{"title":"Sol-Gel Synthesis, Structure, and Adsorption Properties of LiMgxMn(2 – x)O4 (0 ≤ x ≤ 0.7) Oxides","authors":"Sh. A. Begimkulova, A. M. Nasimov, O. N. Ruzimuradov, V. G. Prozorovich, A. I. Ivanets","doi":"10.1134/s0036023624600485","DOIUrl":"https://doi.org/10.1134/s0036023624600485","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Lithium manganese oxides with a spinel structure LiMg<sub><i>x</i></sub>Mn<sub>(2 –</sub> <sub><i>x</i>)</sub>O<sub>4</sub> doped with Mg<sup>2+</sup> ions in the range 0 ≤ <i>x</i> ≤ 0.7, were obtained by sol-gel synthesis. Phase composition and morphology of obtained oxides were studied by X-ray powder diffraction and scanning electron microscopy. It is shown, that in the studied range 0 ≤ <i>x</i> ≤ 0.7 Mg-doped lithium manganese oxides saved the structure of the original cubic spinel LiMn<sub>2</sub>O<sub>4</sub>, while an increase in parameter <i>a</i> was observed from 8.175 to 8.309 Å and average crystallite size practically unchanged (30–36 nm). Samples of the initial LiMn<sub>2</sub>O<sub>4</sub> spinel and Mg-doped spinel consisted of prismatic particles of submicron (0.1–0.2 µm) and micron (1.0–3.0 µm) sizes, respectively. The effect of the adsorbent dose (0.05–0.3 g/L) and pH (3.0–13.0) of the solution on the adsorption efficiency was studied. The adsorption isotherms of samples LiMg<sub>0.3</sub>Mn<sub>1.7</sub>O<sub>4</sub> were described by the Langmuir monomolecular adsorption equation. An increase in the temperature of the model solution from 25 to 45°C was accompanied by an increase in the maximum adsorption of the LiMg<sub>0.3</sub>Mn<sub>1.7</sub>O<sub>4</sub> samples from 10.50 to 10.98 mmol/g, which indicates the endothermic nature of the adsorption process. The kinetics of adsorption was well described by a pseudo-second order equation, which indicates the occurrence of chemical interaction during the adsorption process.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"49 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600266
P. D. Orlova, I. B. Meshkov, E. V. Latipov, S. G. Vasil’ev, A. A. Kalinina, A. M. Muzafarov, I. M. Le-Deygen
Abstract
An approach to the development of peroral iron drug delivery systems for the therapy of iron deficiency anemia is proposed. The new systems are based on polymethylsilsesquioxane hydrogels with a variable structure as biocompatible and biodegradable supports. The hydrogels are found to exhibit a high sorption capacity toward a saturated solution of FeCl3∙6H2O (0.27 M), whereas the sorption capacity toward a saturated solution of iron D-gluconate (0.24 M) is lower and amounts to ~30%. The developed delivery systems are studied by IR and UV spectroscopy, and the iron atom distribution over the hydrogels is studied. The prepared systems are found to be promising for the further development of drug formulations.
{"title":"Functional Design of Peroral Iron Compound Delivery Systems Based on Polymethylsilsesquioxane Hydrogels for the Therapy of Iron Deficiency Anemia","authors":"P. D. Orlova, I. B. Meshkov, E. V. Latipov, S. G. Vasil’ev, A. A. Kalinina, A. M. Muzafarov, I. M. Le-Deygen","doi":"10.1134/s0036023624600266","DOIUrl":"https://doi.org/10.1134/s0036023624600266","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An approach to the development of peroral iron drug delivery systems for the therapy of iron deficiency anemia is proposed. The new systems are based on polymethylsilsesquioxane hydrogels with a variable structure as biocompatible and biodegradable supports. The hydrogels are found to exhibit a high sorption capacity toward a saturated solution of FeCl<sub>3</sub>∙6H<sub>2</sub>O (0.27 M), whereas the sorption capacity toward a saturated solution of iron D-gluconate (0.24 M) is lower and amounts to ~30%. The developed delivery systems are studied by IR and UV spectroscopy, and the iron atom distribution over the hydrogels is studied. The prepared systems are found to be promising for the further development of drug formulations.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"48 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600217
M. D. Lebedev, A. A. Goncharenko, I. A. Skvortsov, M. S. Kuzmikov, A. S. Vashurin
Abstract
This work describes the use of silica particles obtained by sol-gel method as a template for deposition of supramolecular complexes of melamine cyanurate. To obtain SiO2@melamine-cyanurate (SiO2@MCA) material, the method of covalent modification of silica surface by melamine molecules (SiO2-mel) was applied and the method of its further functionalization by hydrogen-bonded organic framework of melamine-cyanurate (HOF, MCA) was proposed. One of the promising directions of using SiO2@melamine-cyanurate is obtaining the SiO2@g-C3N4 material based on it. Control of the amount of applied melamine-cyanurate allows one to potentially obtain g-C3N4 layers of different thicknesses on the silica surface.
{"title":"Synthesis of New Hybrid Materials of SiO2@Melamine-Cyanurate as Precursors for Graphite-Like Carbon Nitride","authors":"M. D. Lebedev, A. A. Goncharenko, I. A. Skvortsov, M. S. Kuzmikov, A. S. Vashurin","doi":"10.1134/s0036023624600217","DOIUrl":"https://doi.org/10.1134/s0036023624600217","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This work describes the use of silica particles obtained by sol-gel method as a template for deposition of supramolecular complexes of melamine cyanurate. To obtain SiO<sub>2</sub>@melamine-cyanurate (SiO<sub>2</sub>@MCA) material, the method of covalent modification of silica surface by melamine molecules (SiO<sub>2</sub>-mel) was applied and the method of its further functionalization by hydrogen-bonded organic framework of melamine-cyanurate (HOF, MCA) was proposed. One of the promising directions of using SiO<sub>2</sub>@melamine-cyanurate is obtaining the SiO<sub>2</sub>@g-C<sub>3</sub>N<sub>4</sub> material based on it. Control of the amount of applied melamine-cyanurate allows one to potentially obtain g-C<sub>3</sub>N<sub>4</sub> layers of different thicknesses on the silica surface.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"28 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600850
E. P. Simonenko, A. S. Mokrushin, I. A. Nagornov, V. M. Sapronova, Yu. M. Gorban, Ph. Yu. Gorobtsov, T. L. Simonenko, N. P. Simonenko, N. T. Kuznetsov
Abstract
A method was developed for producing a nanocomposite containing a Ti0.2V1.8CTx MXene core and surface layers of titanium-doped vanadium oxide by relatively low temperature partial oxidation of multilayer MXene, a two-dimensional vanadium titanium carbide. It was shown that, during the oxidation of the initial Ti0.2V1.8CTx in an air atmosphere at a temperature of 250°C, the microstructure of accordion-like aggregates is preserved with a slight increase in the porosity of their constituent layers and an increase in their thickness due to the formation of V2O5. The MXene structure was detected to be preserved with a decrease in the interplanar distance from 10.3 Å (initial Ti0.2V1.8CTx powder) to 7.3 Å. Raman spectroscopy confirmed the formation of vanadium oxide. Kelvin probe force microscopy determined that, in the formation of Ti0.2V1.8CTx/V2O5 nanocomposite, the work function decreases from 4.88 eV (Ti0.2V1.8CTx) to 4.68 eV. A comprehensive analysis was made of the chemosensory properties of Ti0.2V1.8CTx/V2O5 layers deposited by microplotter printing to a number of gaseous analytes (H2, CO, NH3, NO2, C6H6, C3H6O, CH4, C2H5OH, and O2). At elevated detection temperatures (125–200°C), high sensitivity to oxygen (10% O2) and NO2 (100 ppm) was detected; throughout the entire temperature range (25–200°C), there were noticeable responses to humidity (50% RH). If the temperature detection was room temperature, good sensitivity to acetone, ethanol, and ammonia was observed.
{"title":"Gas-Sensing Properties of the Ti0.2V1.8CTx/V2O5 Nanocomposite","authors":"E. P. Simonenko, A. S. Mokrushin, I. A. Nagornov, V. M. Sapronova, Yu. M. Gorban, Ph. Yu. Gorobtsov, T. L. Simonenko, N. P. Simonenko, N. T. Kuznetsov","doi":"10.1134/s0036023624600850","DOIUrl":"https://doi.org/10.1134/s0036023624600850","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A method was developed for producing a nanocomposite containing a Ti<sub>0.2</sub>V<sub>1.8</sub>CT<sub><i>x</i></sub> MXene core and surface layers of titanium-doped vanadium oxide by relatively low temperature partial oxidation of multilayer MXene, a two-dimensional vanadium titanium carbide. It was shown that, during the oxidation of the initial Ti<sub>0.2</sub>V<sub>1.8</sub>CT<sub><i>x</i></sub> in an air atmosphere at a temperature of 250°C, the microstructure of accordion-like aggregates is preserved with a slight increase in the porosity of their constituent layers and an increase in their thickness due to the formation of V<sub>2</sub>O<sub>5</sub>. The MXene structure was detected to be preserved with a decrease in the interplanar distance from 10.3 Å (initial Ti<sub>0.2</sub>V<sub>1.8</sub>CT<sub><i>x</i></sub> powder) to 7.3 Å. Raman spectroscopy confirmed the formation of vanadium oxide. Kelvin probe force microscopy determined that, in the formation of Ti<sub>0.2</sub>V<sub>1.8</sub>CT<sub><i>x</i></sub>/V<sub>2</sub>O<sub>5</sub> nanocomposite, the work function decreases from 4.88 eV (Ti<sub>0.2</sub>V<sub>1.8</sub>CT<sub><i>x</i></sub>) to 4.68 eV. A comprehensive analysis was made of the chemosensory properties of Ti<sub>0.2</sub>V<sub>1.8</sub>CT<sub><i>x</i></sub>/V<sub>2</sub>O<sub>5</sub> layers deposited by microplotter printing to a number of gaseous analytes (H<sub>2</sub>, CO, NH<sub>3</sub>, NO<sub>2</sub>, C<sub>6</sub>H<sub>6</sub>, C<sub>3</sub>H<sub>6</sub>O, CH<sub>4</sub>, C<sub>2</sub>H<sub>5</sub>OH, and O<sub>2</sub>). At elevated detection temperatures (125–200°C), high sensitivity to oxygen (10% O<sub>2</sub>) and NO<sub>2</sub> (100 ppm) was detected; throughout the entire temperature range (25–200°C), there were noticeable responses to humidity (50% RH). If the temperature detection was room temperature, good sensitivity to acetone, ethanol, and ammonia was observed.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"75 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600400
A. V. Kondakova, A. A. Medvedeva, A. V. Koshkin
Abstract
In order to use the β-cyclodextrin–pyrene complex as a fluorescent receptor center, its stability in the solid phase of a water-soluble silicate gel was studied. For this purpose, a technique for obtaining a silicate matrix with a high content of supramolecular complexes was developed and the temperature stability of the resulting material was investigated. Optimal conditions for operating with complexes in the silica gel matrix were identified. Comparative studies of the fluorescence spectra of complexes in liquid and solid phases were carried out by the method of fluorescence spectroscopy. As a result of the work, it was possible to determine the main patterns of behavior of the supramolecular complex in the silicate hydrogel matrix and to conclude about the influence of the matrix structure on its stability.
{"title":"Stability of Supramolecular β-Cyclodextrin–Pyrene Complexes in a Silicate Hydrogel Matrix","authors":"A. V. Kondakova, A. A. Medvedeva, A. V. Koshkin","doi":"10.1134/s0036023624600400","DOIUrl":"https://doi.org/10.1134/s0036023624600400","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In order to use the β-cyclodextrin–pyrene complex as a fluorescent receptor center, its stability in the solid phase of a water-soluble silicate gel was studied. For this purpose, a technique for obtaining a silicate matrix with a high content of supramolecular complexes was developed and the temperature stability of the resulting material was investigated. Optimal conditions for operating with complexes in the silica gel matrix were identified. Comparative studies of the fluorescence spectra of complexes in liquid and solid phases were carried out by the method of fluorescence spectroscopy. As a result of the work, it was possible to determine the main patterns of behavior of the supramolecular complex in the silicate hydrogel matrix and to conclude about the influence of the matrix structure on its stability.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"22 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600497
S. A. Novikova, Ya. R. Shaer, A. O. Eremina, V. V. Sychev, S. V. Baryshnikov, O. P. Taran
Abstract
Heterogeneous nanocomposite ZrO2@SBA-15 catalysts containing 10 wt % of zirconium oxide were synthesized by two methods: (i) co-condensation and (ii) incipient wetness impregnation. The catalysts and their carriers were characterized by X-ray powder diffraction, X-ray fluorescence analysis, low-temperature nitrogen adsorption–desorption, and FTIR-spectroscopy. As a result of zirconia introduction into the silica wall, the mesostructure of SBA-15 is preserved, but the specific surface area and pore volume are reduced. It was found that during one-stage synthesis, the particle fibers shorten and stick together. The catalysts were tested in the process of catalytic hydrolysis-oxidation of hemicelluloses of aspen wood. The optimal formic acid synthesis conditions were determined to be 150°С and 3 h. The highest formic acid yield obtained using the catalyst prepared by co-condensation under best reaction conditions was 28.4 wt %.
{"title":"Synthesis of Heterogeneous Nanocomposite Catalyst ZrO2@SBA-15 for Formic Acid Production from Hemicelluloses","authors":"S. A. Novikova, Ya. R. Shaer, A. O. Eremina, V. V. Sychev, S. V. Baryshnikov, O. P. Taran","doi":"10.1134/s0036023624600497","DOIUrl":"https://doi.org/10.1134/s0036023624600497","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Heterogeneous nanocomposite ZrO<sub>2</sub>@SBA-15 catalysts containing 10 wt % of zirconium oxide were synthesized by two methods: (i) co-condensation and (ii) incipient wetness impregnation. The catalysts and their carriers were characterized by X-ray powder diffraction, X-ray fluorescence analysis, low-temperature nitrogen adsorption–desorption, and FTIR-spectroscopy. As a result of zirconia introduction into the silica wall, the mesostructure of SBA-15 is preserved, but the specific surface area and pore volume are reduced. It was found that during one-stage synthesis, the particle fibers shorten and stick together. The catalysts were tested in the process of catalytic hydrolysis-oxidation of hemicelluloses of aspen wood. The optimal formic acid synthesis conditions were determined to be 150°С and 3 h. The highest formic acid yield obtained using the catalyst prepared by co-condensation under best reaction conditions was 28.4 wt %.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"11 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600540
M. D. Pecherskaya, O. A. Galkina, O. N. Ruzimuradov, Sh. I. Mamatkulov
Abstract
In this research, the electronic states, band structures, and bond properties of the framework compounds of CoPO4, Co1 –xFexPO4, and Co1 –xNixPO4 were investigated by the density functional theory calculations. The potential capabilities of these systems in the photocatalytic water splitting to produce hydrogen were analyzed. The spin-up electron densities of states for the CoPO4, Co1 –xFexPO4, and Co1 –xNixPO4 systems have band gaps of 2.7, 3.4, and 3.45 eV, respectively. The band of spin-down electron states has several energy gaps above the Fermi level. The density of states of electron with spin up near the Fermi level is obviously greater than that of electrons with spin down. In this case, localized states of electrons appear in the band gap of doped semiconductors due to impurity atoms. The calculated value of the energy at the lower edge of the conduction band for CoPO4 was –0.7 eV, which is more negative than the energy required for water splitting. Meanwhile, the calculated value of the energy at the upper edge of the valence band was 2.01 eV, which is more positive than the oxygen evolution energy of 1.23 eV.
{"title":"Electronic Structure of Cobalt Phosphates Co1 – xMxPO4 Doped with Iron and Nickel Atoms","authors":"M. D. Pecherskaya, O. A. Galkina, O. N. Ruzimuradov, Sh. I. Mamatkulov","doi":"10.1134/s0036023624600540","DOIUrl":"https://doi.org/10.1134/s0036023624600540","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this research, the electronic states, band structures, and bond properties of the framework compounds of CoPO<sub>4</sub>, Co<sub>1 –</sub> <sub><i>x</i></sub>Fe<sub><i>x</i></sub>PO<sub>4</sub>, and Co<sub>1 –</sub> <sub><i>x</i></sub>Ni<sub><i>x</i></sub>PO<sub>4</sub> were investigated by the density functional theory calculations. The potential capabilities of these systems in the photocatalytic water splitting to produce hydrogen were analyzed. The spin-up electron densities of states for the CoPO<sub>4</sub>, Co<sub>1 –</sub> <sub><i>x</i></sub>Fe<sub><i>x</i></sub>PO<sub>4</sub>, and Co<sub>1 –</sub> <sub><i>x</i></sub>Ni<sub><i>x</i></sub>PO<sub>4</sub> systems have band gaps of 2.7, 3.4, and 3.45 eV, respectively. The band of spin-down electron states has several energy gaps above the Fermi level. The density of states of electron with spin up near the Fermi level is obviously greater than that of electrons with spin down. In this case, localized states of electrons appear in the band gap of doped semiconductors due to impurity atoms. The calculated value of the energy at the lower edge of the conduction band for CoPO<sub>4</sub> was –0.7 eV, which is more negative than the energy required for water splitting. Meanwhile, the calculated value of the energy at the upper edge of the valence band was 2.01 eV, which is more positive than the oxygen evolution energy of 1.23 eV.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"19 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600412
O. O. Shichalin, O. V. Kapustina, Z. E. Kornakova, S. S. Gribanova, V. Y. Mayorov, A. N. Fedorets, A. O. Lembikov, V. V. Vasilyeva, I. Y. Buravlev, V. I. Apanasevich, E. K. Papynov
Abstract
The dispersed Ca3La6(SiO4)6 biocomposite was obtained by treating a calcium silicate sol containing 0.1, 0.3, and 0.7 mol of La3+ under hydrothermal conditions. The composition, morphology, and structure of the biocomposite were studied by powder X-ray diffraction, SEM, and EDS methods. The reaction products (CaSiO3, CaLa4(SiO4)3O, Ca3La6(SiO4)6) depending on the La3+ concentration were determined. The structural characteristics of biocomposite powders with different La3+ contents were investigated by BET and DFT methods. The sorption characteristics of the materials towards 5-fluorouracil were studied depending on pH. The highest sorption capacity (0.768 mg/g at pH 3) was found for the Ca3La6(SiO4)6 sample containing 0.3 mol of La3+. Additionally, the biocompatible properties of biocomposite samples in contact with artificial blood plasma were evaluated by establishing the key changes in their composition, morphology, and structure upon the formation of the apatite bioactive phase on the accessible surface of the samples. These results hold promise for further development of new sorption materials, including biomaterials, for targeted drug delivery with a potential for practical application.
{"title":"Synthesis and Study of Sorption Properties of Ca3La6(SiO4)6 Biocomposite for Targeted Delivery of 5-Fluorouracil","authors":"O. O. Shichalin, O. V. Kapustina, Z. E. Kornakova, S. S. Gribanova, V. Y. Mayorov, A. N. Fedorets, A. O. Lembikov, V. V. Vasilyeva, I. Y. Buravlev, V. I. Apanasevich, E. K. Papynov","doi":"10.1134/s0036023624600412","DOIUrl":"https://doi.org/10.1134/s0036023624600412","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The dispersed Ca<sub>3</sub>La<sub>6</sub>(SiO<sub>4</sub>)<sub>6</sub> biocomposite was obtained by treating a calcium silicate sol containing 0.1, 0.3, and 0.7 mol of La<sup>3+</sup> under hydrothermal conditions. The composition, morphology, and structure of the biocomposite were studied by powder X-ray diffraction, SEM, and EDS methods. The reaction products (CaSiO<sub>3</sub>, CaLa<sub>4</sub>(SiO<sub>4</sub>)<sub>3</sub>O, Ca<sub>3</sub>La<sub>6</sub>(SiO<sub>4</sub>)<sub>6</sub>) depending on the La<sup>3+</sup> concentration were determined. The structural characteristics of biocomposite powders with different La<sup>3+</sup> contents were investigated by BET and DFT methods. The sorption characteristics of the materials towards 5-fluorouracil were studied depending on pH. The highest sorption capacity (0.768 mg/g at pH 3) was found for the Ca<sub>3</sub>La<sub>6</sub>(SiO<sub>4</sub>)<sub>6</sub> sample containing 0.3 mol of La<sup>3+</sup>. Additionally, the biocompatible properties of biocomposite samples in contact with artificial blood plasma were evaluated by establishing the key changes in their composition, morphology, and structure upon the formation of the apatite bioactive phase on the accessible surface of the samples. These results hold promise for further development of new sorption materials, including biomaterials, for targeted drug delivery with a potential for practical application.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"22 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624700529
S. A. Kuznetsova, O. S. Khalipova, A. N. Shamsutdinova
Abstract
This study is devoted to the preparation of strong spherical V2O5/TiO2–SiO2 composite by a combined template and sol-gel method. The composition, size, and shape of the colloidal particles in butanol sol with tetrabutoxytitanium and tetraethoxysilane have been determined. The physicochemical processes leading to the strengthening of the spherical agglomerates obtained using an anion exchanger with a gel structure have been established. Electrophoresis, small-angle X-ray scattering, and viscometry have been used to demonstrate the presence of positively charged colloidal particles of lenticular and cylindrical shape in the sol. The size of the particles, when the sol is stabilized, reaches 53 Å. The absorption of the sol by the anion exchanger in vanadium form is due to the equalization of the osmotic pressure in the anion exchanger/sol system. Spherical composites with a diameter of 300 µm have been obtained. It has been shown by X-ray powder diffraction that the composites consist of V2O5 with an orthorhombic structure, TiO2 with an anatase structure, and amorphous silicon dioxide. The interaction at the interface between the phases of V2O5 with TiO2 and SiO2 has been demonstrated by IR and Raman spectroscopy. This interaction leads to the strengthening of the sphere of the V2O5/TiO2–SiO2 composite. The results obtained can be used for the synthesis of the spherical MxOy/TiO2–SiO2 composites.
{"title":"Strengthening of Spherical V2O5/TiO2−SiO2 Composites Obtained by Template Synthesis Combined with Sol-Gel Method","authors":"S. A. Kuznetsova, O. S. Khalipova, A. N. Shamsutdinova","doi":"10.1134/s0036023624700529","DOIUrl":"https://doi.org/10.1134/s0036023624700529","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This study is devoted to the preparation of strong spherical V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub>–SiO<sub>2</sub> composite by a combined template and sol-gel method. The composition, size, and shape of the colloidal particles in butanol sol with tetrabutoxytitanium and tetraethoxysilane have been determined. The physicochemical processes leading to the strengthening of the spherical agglomerates obtained using an anion exchanger with a gel structure have been established. Electrophoresis, small-angle X-ray scattering, and viscometry have been used to demonstrate the presence of positively charged colloidal particles of lenticular and cylindrical shape in the sol. The size of the particles, when the sol is stabilized, reaches 53 Å. The absorption of the sol by the anion exchanger in vanadium form is due to the equalization of the osmotic pressure in the anion exchanger/sol system. Spherical composites with a diameter of 300 µm have been obtained. It has been shown by X-ray powder diffraction that the composites consist of V<sub>2</sub>O<sub>5</sub> with an orthorhombic structure, TiO<sub>2</sub> with an anatase structure, and amorphous silicon dioxide. The interaction at the interface between the phases of V<sub>2</sub>O<sub>5</sub> with TiO<sub>2</sub> and SiO<sub>2</sub> has been demonstrated by IR and Raman spectroscopy. This interaction leads to the strengthening of the sphere of the V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub>–SiO<sub>2</sub> composite. The results obtained can be used for the synthesis of the spherical M<sub><i>x</i></sub>O<sub><i>y</i></sub>/TiO<sub>2</sub>–SiO<sub>2</sub> composites.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"169 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-31DOI: 10.1134/s0036023624600527
Yu. N. Zaitseva, A. O. Eremina, V. V. Sychev, V. A. Golubkov, S. A. Novikova, O. P. Taran, S. D. Kirik
Abstract
Hydrogenation catalysts based on functionalized CMK-3 (Carbon Mesostructured by KAIST) carbon material and ruthenium nanoparticles have been developed. SBA-15 mesostructured silicate with enlarged wall channels has been used as a template for the carbon replica synthesis. The effect of carbon material functionalization via humid air oxidation and sulfonation on the morphology, physicochemical properties, and activity of the catalyst has been studied. The degree of dispersion, localization, and electronic state of supported ruthenium depending on the support functionalization method have been determined. The initial support structure preservation after Ru deposition has been confirmed by a number of physicochemical methods. Metal particles are distributed over carrier surface without agglomeration, at size corresponding to mesostructure which provides high accessibility of active centers. The catalysts have been tested in the hydrogenation of glucose into sorbitol. Pore morphology and preservation of initial carbon support structure play important role in the catalytic activity of Ru particles.
{"title":"Synthesis and Study of Ru-Containing Catalysts on Mesostructured Carbon for Glucose Hydrogenation","authors":"Yu. N. Zaitseva, A. O. Eremina, V. V. Sychev, V. A. Golubkov, S. A. Novikova, O. P. Taran, S. D. Kirik","doi":"10.1134/s0036023624600527","DOIUrl":"https://doi.org/10.1134/s0036023624600527","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Hydrogenation catalysts based on functionalized CMK-3 (Carbon Mesostructured by KAIST) carbon material and ruthenium nanoparticles have been developed. SBA-15 mesostructured silicate with enlarged wall channels has been used as a template for the carbon replica synthesis. The effect of carbon material functionalization via humid air oxidation and sulfonation on the morphology, physicochemical properties, and activity of the catalyst has been studied. The degree of dispersion, localization, and electronic state of supported ruthenium depending on the support functionalization method have been determined. The initial support structure preservation after Ru deposition has been confirmed by a number of physicochemical methods. Metal particles are distributed over carrier surface without agglomeration, at size corresponding to mesostructure which provides high accessibility of active centers. The catalysts have been tested in the hydrogenation of glucose into sorbitol. Pore morphology and preservation of initial carbon support structure play important role in the catalytic activity of Ru particles.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"44 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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