N. Garyntseva, I. Sudakova, A. Chudina, B. Kuznetsov
The possibility of isolation of high-quality cellulose by peroxide delignification of birch wood in an acetic acid-water medium in the presence of a TiO2 catalyst at a temperature of 100 °C was shown. The influence of the process conditions (concentration of hydrogen peroxide and acetic acid, liquid/wood ratio (LWR)) on the yield and composition of cellulose products was established. Numerical optimization of the process was carried out using a full factorial experiment. The optimal conditions for isolation from birch wood a cellulose product with residual lignin content of ≤ 1 wt.% are: СН3СООН concentration 23.8 wt.%, Н2О2 concentration 4.9 wt.%, LWR14.9, temperature 100 °C, time 4 h. Under these optimal conditions, the yield of a cellulose product with a cellulose content of 92.5 wt.% was 49.9 wt.%
{"title":"Numerical Optimization of the Process of Cellulose Isolation by Peroxide Delignification of Birch Wood in Acetic Acid-Water Medium in the Presence of TiO₂ Catalyst","authors":"N. Garyntseva, I. Sudakova, A. Chudina, B. Kuznetsov","doi":"10.17516/1998-2836-0222","DOIUrl":"https://doi.org/10.17516/1998-2836-0222","url":null,"abstract":"The possibility of isolation of high-quality cellulose by peroxide delignification of birch wood in an acetic acid-water medium in the presence of a TiO2 catalyst at a temperature of 100 °C was shown. The influence of the process conditions (concentration of hydrogen peroxide and acetic acid, liquid/wood ratio (LWR)) on the yield and composition of cellulose products was established. Numerical optimization of the process was carried out using a full factorial experiment. The optimal conditions for isolation from birch wood a cellulose product with residual lignin content of ≤ 1 wt.% are: СН3СООН concentration 23.8 wt.%, Н2О2 concentration 4.9 wt.%, LWR14.9, temperature 100 °C, time 4 h. Under these optimal conditions, the yield of a cellulose product with a cellulose content of 92.5 wt.% was 49.9 wt.%","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"25 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73912327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Fadeeva, S. Saikova, E. Pikurova, A. Voronin, Y. Fadeev, A. Samoilo, I. A. Tambasov
In the work, sedimentation-stable sols of indium (III) and tin (IV) hydroxides were obtained by the Anion Resin Exchange Precipitation, which consists of the exchange reaction between the OH ions of the anion exchange resin and the anions of metal-containing solutions. The synthesized hydrosols were used to obtain conducting films of indium (III) In2O3 oxide and indium oxide doped with Tin In2O3: Sn, with a surface resistance of 4 kOhm/sq, thicknesses of 200–500 nm and a transparency of more than 85 %. The modes of applying precursors to glass substrates by the modified spray method and centrifugation method are selected. Films were studied using XRD, SEM, optical microscopy and spectrophotometry
{"title":"А New Method of Obtaining Transparent Conducting Films of Indium (III) Oxide and Indium-Tin Oxide","authors":"N. Fadeeva, S. Saikova, E. Pikurova, A. Voronin, Y. Fadeev, A. Samoilo, I. A. Tambasov","doi":"10.17516/1998-2836-0215","DOIUrl":"https://doi.org/10.17516/1998-2836-0215","url":null,"abstract":"In the work, sedimentation-stable sols of indium (III) and tin (IV) hydroxides were obtained by the Anion Resin Exchange Precipitation, which consists of the exchange reaction between the OH ions of the anion exchange resin and the anions of metal-containing solutions. The synthesized hydrosols were used to obtain conducting films of indium (III) In2O3 oxide and indium oxide doped with Tin In2O3: Sn, with a surface resistance of 4 kOhm/sq, thicknesses of 200–500 nm and a transparency of more than 85 %. The modes of applying precursors to glass substrates by the modified spray method and centrifugation method are selected. Films were studied using XRD, SEM, optical microscopy and spectrophotometry","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"26 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78237544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. V. Kornienko, T. Kenova, V. L. Kornienko, A. Kukushkin
Kinetics and selectivity of indirect electrocatalytic resorcinol oxidation by active oxygen forms (AOF) in situ generated from oxygen in gas diffusion electrode (GDE) mesostructured carbon CMK‑3 and Pt, Pb/PbO2 at different pH were studied. The high resorcinol oxidation process effectivity in both Pt-GDE at pH=10 (99 %) and Pb/PbO2 + Fe2+ at рН=2 (99 %) systems was shown; the resorcinol oxidation scheme was proposed
{"title":"Electrocatalytic Resorcinol Oxidation by Active Oxygen forms in Situ Generated in Conjugate Reactions on Pt and Pb/PbO₂ Anodes and Mesostructured Carbon Cathode СМК‑3","authors":"G. V. Kornienko, T. Kenova, V. L. Kornienko, A. Kukushkin","doi":"10.17516/1998-2836-0217","DOIUrl":"https://doi.org/10.17516/1998-2836-0217","url":null,"abstract":"Kinetics and selectivity of indirect electrocatalytic resorcinol oxidation by active oxygen forms (AOF) in situ generated from oxygen in gas diffusion electrode (GDE) mesostructured carbon CMK‑3 and Pt, Pb/PbO2 at different pH were studied. The high resorcinol oxidation process effectivity in both Pt-GDE at pH=10 (99 %) and Pb/PbO2 + Fe2+ at рН=2 (99 %) systems was shown; the resorcinol oxidation scheme was proposed","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"21 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76196635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Vasilyeva, S. Nekipelov, B. Makeev, Alexey G. Krasnov, N. Zhuk
The electronic state and character of exchange interactions of nickel and chromium atoms in solid solutions of Bi5Nb3-3xМ3xO15-δ (М-Cr,Ni) was researched by methods of magnetic susceptibility and NEXAFS-spectroscopy. NEXAFS spectra of nickel and chromium oxides were obtained. According to X-ray spectroscopy in solid solutions, chromium atoms are mainly in the charge state of Cr(III), and nickel atoms in the high-spin state of Ni(II) in octahedral coordination. In solid solutions, paramagnetic chromium and nickel atoms are present in the form of monomers and clusters with a common antiferromagnetic type of exchange
{"title":"NEXAFS–Spectra and Magnetic Susceptibility of Nickel and Chromium Doped of Bismuth Niobate","authors":"I. Vasilyeva, S. Nekipelov, B. Makeev, Alexey G. Krasnov, N. Zhuk","doi":"10.17516/1998-2836-0187","DOIUrl":"https://doi.org/10.17516/1998-2836-0187","url":null,"abstract":"The electronic state and character of exchange interactions of nickel and chromium atoms in solid solutions of Bi5Nb3-3xМ3xO15-δ (М-Cr,Ni) was researched by methods of magnetic susceptibility and NEXAFS-spectroscopy. NEXAFS spectra of nickel and chromium oxides were obtained. According to X-ray spectroscopy in solid solutions, chromium atoms are mainly in the charge state of Cr(III), and nickel atoms in the high-spin state of Ni(II) in octahedral coordination. In solid solutions, paramagnetic chromium and nickel atoms are present in the form of monomers and clusters with a common antiferromagnetic type of exchange","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"18 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88831502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. S. Chudin, V. V. Verpekin, G. V. Burmakina, Dmitry V. Zimonin, A. Kondrasenko, A. I. Rubaylo
The μ-phenylvinylidene complexes Cp(CO)2RePt(μ-C=CHPh)(PPh2H)(L) [L = PPh3 (1), P(OPri)3 (2)] were synthesized for the first time. Their IR, NMR spectroscopic and redox properties were studied. Based on IR, NMR spectroscopic data their molecular structures were proposed. The pathways of redox-reactions of the complexes were determined
{"title":"Phenylvinylidene RePt Complexes Containing Diphenylphosphine Ligands at the Platinum Atom: Synthesis, IR, NMR Spectroscopic and Electrochemical Properties","authors":"O. S. Chudin, V. V. Verpekin, G. V. Burmakina, Dmitry V. Zimonin, A. Kondrasenko, A. I. Rubaylo","doi":"10.17516/1998-2836-0191","DOIUrl":"https://doi.org/10.17516/1998-2836-0191","url":null,"abstract":"The μ-phenylvinylidene complexes Cp(CO)2RePt(μ-C=CHPh)(PPh2H)(L) [L = PPh3 (1), P(OPri)3 (2)] were synthesized for the first time. Their IR, NMR spectroscopic and redox properties were studied. Based on IR, NMR spectroscopic data their molecular structures were proposed. The pathways of redox-reactions of the complexes were determined","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"444 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82893401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Kuzmin, A. Kuzmina, S. Kalyakin, M. A. Mulagaleeva
The extraction of scandium chlorides, bromides and iodides from aqueous solutions with mixtures of tributyl phosphate (TBP) and molecular iodine was studied. Extraction of scandium halides using TBP with the addition of iodine increases by more than 100 times. Salt distribution coefficients increase in the series ScCl3
{"title":"Extraction of Scandium Halides with Mixtures of Tributylphosphate and Molecular Iodine","authors":"V. Kuzmin, A. Kuzmina, S. Kalyakin, M. A. Mulagaleeva","doi":"10.17516/1998-2836-0194","DOIUrl":"https://doi.org/10.17516/1998-2836-0194","url":null,"abstract":"The extraction of scandium chlorides, bromides and iodides from aqueous solutions with mixtures of tributyl phosphate (TBP) and molecular iodine was studied. Extraction of scandium halides using TBP with the addition of iodine increases by more than 100 times. Salt distribution coefficients increase in the series ScCl3","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"33 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82375312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Vasilyeva, A. S. Kazachenko, Y. Malyar, B. Kuznetsov
It was found that when betulin is sulfated with chlorosulfonic acid in pyridine medium, 3,28-disulfate of betulin is formed in a stable salt form. Under optimal synthesis conditions: temperature 70 °C, duration 2 hours, molar ratio betulin / chlorosulfonic acid 4.0, betulin is completely converted into betulin 3.28-disulfate. The structure and composition of betulin 3,28-disulfate were confirmed by elemental analysis, IR, Raman and 13C NMR spectroscopy. Betulin 3,28-disulfate was isolated both in the form of an unstable H + -form and in a stable forms of sodium and pyridinium salts. Sodium salt of 3,28-disulfate is a needle-like crystals collected in cobweb-like aggregates. The sodium salt of 3,28-disulfate has mycellar properties, the critical concentration of mycellar formation is 0.23 mmol / L.
{"title":"Sulfation of Betulin with Chlorosulfonic Acid in Pyridine","authors":"N. Vasilyeva, A. S. Kazachenko, Y. Malyar, B. Kuznetsov","doi":"10.17516/1998-2836-0197","DOIUrl":"https://doi.org/10.17516/1998-2836-0197","url":null,"abstract":"It was found that when betulin is sulfated with chlorosulfonic acid in pyridine medium, 3,28-disulfate of betulin is formed in a stable salt form. Under optimal synthesis conditions: temperature 70 °C, duration 2 hours, molar ratio betulin / chlorosulfonic acid 4.0, betulin is completely converted into betulin 3.28-disulfate. The structure and composition of betulin 3,28-disulfate were confirmed by elemental analysis, IR, Raman and 13C NMR spectroscopy. Betulin 3,28-disulfate was isolated both in the form of an unstable H + -form and in a stable forms of sodium and pyridinium salts. Sodium salt of 3,28-disulfate is a needle-like crystals collected in cobweb-like aggregates. The sodium salt of 3,28-disulfate has mycellar properties, the critical concentration of mycellar formation is 0.23 mmol / L.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"7 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80970224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adamantylation of 1-napthol and 1-methoxynaphthol in the mixture of phosphoric and glacial acetic acids leads to the formation of 2- and 4-substituted products. Formed products are less involved into the further oxidative transformations in used conditions
{"title":"Synthesis of 4-(1-Adamantyl)-1-Naphthol and 4-(1-Adamantyl)-1-Methoxynaphthalene","authors":"A. Kondrasenko, I. Peterson, A. I. Rubaylo","doi":"10.17516/1998-2836-0185","DOIUrl":"https://doi.org/10.17516/1998-2836-0185","url":null,"abstract":"Adamantylation of 1-napthol and 1-methoxynaphthol in the mixture of phosphoric and glacial acetic acids leads to the formation of 2- and 4-substituted products. Formed products are less involved into the further oxidative transformations in used conditions","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"10 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77766078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. M. Sharonova, V. M. Kirilets, L. Solovyov, A. Anshits
Composite materials (CM) were obtained on the basis of fine- dispersed high-calcium fly ash (HCFA), selected from the 4th field of electrostatic precipitators of Krasnoyarsk TPP-2, with the addition of Melflux 5581F superplasticizer at the water: binder ratio W/B = 0.25. The influence of the concentration of superplasticizer in the range 0.06-0.6 wt. % on the strength properties of composite materials was studied. The effect of the addition of sodium sulfate as an accelerator of hydration hardening and additives-retarders of sodium phosphate, sodium tetraborate and citric acid, were studied. The optimal concentration of superplasticizer was established (0.3 wt. %). It was determined that sodium sulfate helps to improve the strength of CM, and the addition of sodium tetraborate and citric acid can effectively regulate the setting time
{"title":"Influence of Chemical Additives on the Properties of Composite Materials Based on Fine-Dispersed High-Calcium Fly Ash","authors":"O. M. Sharonova, V. M. Kirilets, L. Solovyov, A. Anshits","doi":"10.17516/1998-2836-0192","DOIUrl":"https://doi.org/10.17516/1998-2836-0192","url":null,"abstract":"Composite materials (CM) were obtained on the basis of fine- dispersed high-calcium fly ash (HCFA), selected from the 4th field of electrostatic precipitators of Krasnoyarsk TPP-2, with the addition of Melflux 5581F superplasticizer at the water: binder ratio W/B = 0.25. The influence of the concentration of superplasticizer in the range 0.06-0.6 wt. % on the strength properties of composite materials was studied. The effect of the addition of sodium sulfate as an accelerator of hydration hardening and additives-retarders of sodium phosphate, sodium tetraborate and citric acid, were studied. The optimal concentration of superplasticizer was established (0.3 wt. %). It was determined that sodium sulfate helps to improve the strength of CM, and the addition of sodium tetraborate and citric acid can effectively regulate the setting time","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89685014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The extraction of the nitrates of the rare earth metals with mixtures consisting of binary extractants was explored: 2-ethylhexyl-mono-2-ethylhexyl ether phosphonate tri-n-octylamine, di- (2-ethylhexyl) phosphate tri-n-octylamine and a neutral extractant (solvating reagent) – tri-n-octylamine nitrate. It was established that the extraction of the nitrates of the REM occurs in accordance with the patterns of binary extraction. Extraction systems are characterized by high selectivity in regard to rare-earth metals Pages
{"title":"The Extraction of the Nitrates of the Rare Earth Metals by Mixtures of Binary and Neutral Extractants","authors":"S. Kalyakin, M. A. Mulagaleeva, A. Kuzmina","doi":"10.17516/1998-2836-0189","DOIUrl":"https://doi.org/10.17516/1998-2836-0189","url":null,"abstract":"The extraction of the nitrates of the rare earth metals with mixtures consisting of binary extractants was explored: 2-ethylhexyl-mono-2-ethylhexyl ether phosphonate tri-n-octylamine, di- (2-ethylhexyl) phosphate tri-n-octylamine and a neutral extractant (solvating reagent) – tri-n-octylamine nitrate. It was established that the extraction of the nitrates of the REM occurs in accordance with the patterns of binary extraction. Extraction systems are characterized by high selectivity in regard to rare-earth metals\u0000\u0000Pages","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75518012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：