IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA最新文献

{"title":"ELECTROCHEMICAL DISPERSION OF GRAPHITE IN 58% NITRIC ACID TO PRODUCE MULTILAYER GRAPHENE OXIDE","authors":"E. Yakovleva, A. Yakovlev, I. N. Frolov, A. Mostovoy, V. Tseluikin","doi":"10.6060/ivkkt.20216403.6324","DOIUrl":"https://doi.org/10.6060/ivkkt.20216403.6324","url":null,"abstract":"Electrochemical oxidation of graphite powder in 58% HNO3 was studied. Samples of oxidized graphite were obtained with a imparting of the amount of electricity 500, 700, 1500 mAh g-1. The character of the galvanostatic dependencies allows to select a region of the formation of intercalated compounds of graphite prior to the accumulation of quantity of electricity of 500 mA h g-1. It was found that when the quantity of electricity of over 700 mA h g-1 the process of electrochemical peroxidation of intercalated graphite begins with the formation of multilayer graphene oxide, as confirmed by comprehensive studies using X-ray diffraction, scanning electron microscopy, FTIR spectroscopy, laser diffraction. The synthesized multilayer graphene oxide is characterized by the presence of a spectrum of oxygen-containing functional groups, mainly hydroxyl, as well as carboxyl, epoxy and alkoxyl. X-ray images show a peak at 2θ = 11.45° which intensity increases for re-oxidized graphite compounds and also indicate the formation of a multilayer graphene oxide with an interlayer distance of 7.8 Å. The synthesized material in aqueous suspensions under the action of ultrasound is dispersed with a 7-11-fold reduction in particle size. Graphene layers remains layered structure but the degree of their deformation increases, and the thickness of the layers decreases with an increase in the imparted amount of electricity.","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80675184","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}

{"title":"MULTI-RESPONSE OPTIMISATION OF ELECTRODEPOSITION OF NANO-CRYSTALLINE COMPOSITE COATINGS Cr-Cr3P IN STATU NASCENDI FROM TRIVALENT CHROMIUM-BATHS","authors":"E. G. Vinokurov, T. Burukhina, Ekaterina Yu. Napedenina","doi":"10.6060/ivkkt.20216403.6341","DOIUrl":"https://doi.org/10.6060/ivkkt.20216403.6341","url":null,"abstract":"In this paper the effect of parameters such as current density, temperature, electrolytic bath pH and concentration of chromium sulfate and sodium hypophosphite on the electrodeposition process of the Cr-P alloys was investigated. Chemical composition of the coatings was evaluated by scanning electron microscopy and X-ray diffraction. Experimental design 25-1 central composite design was used to evaluate the chemical composition of alloys, current efficiency and the appearance of coatings as well as to optimize the electrodeposition process of the alloy using Response Surface Methodology associated with experimental design. The Harrington desirability function was applied for optimization. The optimal composition of bath (in g/l) and electrolysis conditions are proposed: Cr2(SO4)3·6H2O – 285, Al2(SO4)3·12H2O – 120, Na2SO4 – 50, NaH2PO2·H2O – 20, CO(NH2)2 – 70, рН – 1.3, temperature – 35 ºС, current density – 46 А/dm2. An acceptable current efficiency 13-14 % was observed for an alloy obtained under optimal conditions of 46 A/dm2, 35 °C and pH 1.3 from an electrolyte of optimal composition. Under these conditions, the coating contained 16 wt.% phosphorus. The alloys were X-ray amorphous at a phosphorus content of about 6 wt.%. When the phosphorus content was 16 wt.% the alloys became nanocrystalline and the chromium phosphide – Cr3P phase was released, which can be seen from the peaks on X-ray diffractograms. This indicates the formation of Cr-Cr3P nanocrystalline composite coatings under nucleation conditions (in Statu Nascendi). Therefore, the results of this work show the importance of using optimization techniques to obtain metallic coatings with controlled properties for different types of applications.","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78287869","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}

{"title":"Adsorption of organic substances using zeolites","authors":"I. I. Menshova, E. Zabolotnaya, V. V. Chelnokov, A. V. Garabadzhiu","doi":"10.6060/ivkkt.20216408.6427","DOIUrl":"https://doi.org/10.6060/ivkkt.20216408.6427","url":null,"abstract":"","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74435342","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}

{"title":"PREPARATION AND PROPERTIES OF COMPOSITE NANOMATERIALS USING TWO-LAYER COPPER PARTICLES","authors":"N. A. Taratanov, Svetlana A. Syrbu","doi":"10.6060/ivkkt.20216412.6395","DOIUrl":"https://doi.org/10.6060/ivkkt.20216412.6395","url":null,"abstract":"","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"2010 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86311080","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}

{"title":"WOOD COMPONENTS AS SOURCES OF PENTO-CONTAINING RAW MATERIALS FOR SYNTHESIS OF USEFUL COMPOUNDS, PRODUCTS AND REAGENTS","authors":"I. Chetvertneva, O. Karimov, G. Teptereva, N. S. Tivas, E. Movsumzade, E. Babayev","doi":"10.6060/ivkkt.20216403.6363","DOIUrl":"https://doi.org/10.6060/ivkkt.20216403.6363","url":null,"abstract":"The paper considers the main components and products of wood processing, agricultural waste, pulp and paper industry waste and qualifies them as sources of pentose-containing resource-renewable domestic raw materials. The article describes in detail the structural components of wood as a natural polymer, which contains aromatic and carbohydrate parts. It is noted that these poly-mers are promising as raw materials for the production of useful chemical products. The role of lignin, cellolose and hemicellulose in the design of mechanical and structural properties of wood is considered. The article considers the features of the sulfonation reactions of the lignin monomer unit depending on the pH of the medium: acidic, neutral and alkaline. There are three main reac-tions that occur simultaneously with lignin in the process of wood delignification during sulfite cooking, such as the sulfonation reaction, the hydrolytic destruction reaction, and the condensation reaction. It is shown that the lignin-hemicellulose matrix contains three types of interconnected mesh structures: the lignin itself; a network of covalent bonds of lignin with hemicelluloses, and a network whose structure is obtained due to the hydrogen bond and the forces of the physical inter-action of lignin and hemicelluloses. The features of chemical transformations of the monomeric aromatic link of lignosulfonate – phenylpropane unit in the processes of wood delignification, the main chemical reactions of wood raw material delignification under the conditions of sulfite and neutral-sulfite brews are shown. The method of quantitative determination of monosaccharides in the composition of the carbohydrate part is proposed.","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80246402","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}

{"title":"Increasing heat resistance of products from heat extended graphite","authors":"A.D. Nozdryukhin, I. S. Potapov, V. Poilov, M. Cherepanova","doi":"10.6060/ivkkt.20216408.6404","DOIUrl":"https://doi.org/10.6060/ivkkt.20216408.6404","url":null,"abstract":"","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"104 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76116981","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}

{"title":"ELECTROCHEMICAL BEHAVIOR OF SILVER IN CHLORIDE-CONTAINING SOLUTIONS AT CYCLIC POLARIZATION","authors":"Valeria S. Belova, A. V. Balmasov","doi":"10.6060/ivkkt.20216411.6450","DOIUrl":"https://doi.org/10.6060/ivkkt.20216411.6450","url":null,"abstract":"В статье приведены результаты исследования электрохимического поведения серебра в растворах 0,9% хлорида натрия, 0,5% хлористоводородной кислоты и 0,9% растворе хлорида натрия с добавкой 1,5% лимонной кислоты в условиях циклической поляризации. Установлено, что при циклической поляризации в растворе NaCl хлорид серебра, образующийся на поверхности в период анодного полуцикла, полностью восстанавливается в период катодной поляризации. Это подтверждается равенством количества электричества, прошедшего за анодный и катодный полуциклы. Применение кислых растворов способствует ускорению процесса анодного окисления серебра. В ходе циклирования потенциала наблюдается увеличение анодных и катодных токов вследствие формирования более развитой поверхности электрода. С наибольшей интенсивностью окислительно-восстановительные процессы протекают в электролите на основе хлорида натрия с добавкой лимонной кислоты. Это связано со стадийным протеканием анодного окисления серебра с образованием в качестве промежуточного продукта цитрата серебра, обладающего большей растворимостью по сравнению с AgCl. Исследования электродов методом сканирующей электронной микроскопии показали, что использование для электрохимической модификации серебра изученных хлоридсодержащих растворов обеспечивает формирование на поверхности серебра кристаллов AgCl размером от 0,2 до 0,5 мкм. Серебряные электроды, поверхность которых подвергалась электрохимической модификации в электролите на основе хлорида натрия с добавкой лимонной кислоты, характеризуются стабильным электродным потенциалом сразу после погружения в раствор, моделирующий биологическую среду человека. Это имеет важное значение при регистрации биопотенциалов с применением коаксиальных игольчатых электродов с центральным элементом из серебра.","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73767635","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}

{"title":"EFFECT OF THE LASER RADIATION EXPOSURE ON MECHANICAL PROPERTIES OF 3D C60","authors":"F. Khorobrykh, V. Churkin, M. Popov, B. Kulnitskiy","doi":"10.6060/ivkkt.20216412.9y","DOIUrl":"https://doi.org/10.6060/ivkkt.20216412.9y","url":null,"abstract":"","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82465603","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}

{"title":"BROMINATION OF PHTHALATE-CONTAINING SYSTEMS OBTAINED FROM INDUSTRIAL WASTE","authors":"R. Plotnikova, V. Korchagin, L. Popova","doi":"10.6060/ivkkt.20216411.6429","DOIUrl":"https://doi.org/10.6060/ivkkt.20216411.6429","url":null,"abstract":"","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80211229","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}

{"title":"EXTRACTION OF RUBBER FROM LATEX BY HYBRID COAGULANT BASED ON POLYDIMETHYLDIALLYLAMMONIUM CHLORIDE AND VISCOSE FIBER","authors":"N. Nikulina, I. Pugacheva, V. Misin, V. Verezhnikov, N. Sannikova, S. Nikulin","doi":"10.6060/ivkkt.20216406.6356","DOIUrl":"https://doi.org/10.6060/ivkkt.20216406.6356","url":null,"abstract":"In the proposed work, the possibility of using a hybrid coagulant based on a polymer cationic electrolyte-VPK – 402 (poly-N,N-dimethyl-N, N-diallylammonium chloride) in combination with viscose fiber in the technological process of separating SKS-30 ark rubber from latex is considered. The influence of the consumption of a hybrid coagulating agent, viscose fiber and its dosage, as well as the process temperature on the reduction of the aggregate stability of styrene-butadiene latex is considered. The influence of viscose fiber on the physical and mechanical properties of vulcanizates is established. At the same time, a number of features were noted consisting in a decrease in the aggregate stability of latex butadiene-styrene rubber during its coagulation with a hybrid coagulant. It was found that the use of a hybrid coagulant can reduce the consumption of cationic polyelectrolyte by up to 30%. It is shown that in the multicomponent system under consideration, several processes can occur simultaneously, which lead to the destabilization of latex dispersions. The use of a hybrid coagulant, including cationic polyelectrolyte, provides a combined effect of the bridging and neutralization mechanisms of violation of the aggregate stability of the dispersion. The presence of viscose fiber in the dispersed phase leads to an additional coagulating effect-adagulation, which is a kind of heterocoagulation. This may be due to the difference in surface potentials between the latex globules and the fiber additive. It is established that the temperature regime of the process of isolation of rubber from latex does not significantly affect the completeness of the extraction of rubber from latex. A decrease in the content of components of the emulsion system in wastewater discharged from the shops producing rubbers by emulsion polymerization was noted. According to the main physical and mechanical parameters, rubbers, rubber mixtures and vulcanizates prepared on their basis meet the requirements.","PeriodicalId":14640,"journal":{"name":"IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74165004","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}