Eurasian Chemico-Technological Journal最新文献_第6页

Determination of Boron, Lithium and Some Metals in Fly Ash by Laser Ablation ‒ Inductively Coupled Plasma ‒ Optical Emission Spectr ometry 激光烧蚀-电感耦合等离子体-光学发射光谱法测定飞灰中的硼、锂和某些金属

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Eurasian Chemico-Technological Journal Pub Date : 2022-07-25 DOI: 10.18321/ectj1324

R. Kolmykov

引用次数: 0

Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides 钴镍混合氢氧化物纳米粒子修饰多壁碳纳米管复合材料的电化学性能

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Eurasian Chemico-Technological Journal Pub Date : 2022-07-25 DOI: 10.18321/ectj1323

E. Kachina, N. Ivanova, Y. Zakharov, G. Simenyuk, Z. Ismagilov, M. Lomakin

{"title":"Electrochemical Properties of the Composites Based on Multiwall Carbon Nanotubes Modified with Nanoparticles of Mixed Cobalt and Nickel Hydroxides","authors":"E. Kachina, N. Ivanova, Y. Zakharov, G. Simenyuk, Z. Ismagilov, M. Lomakin","doi":"10.18321/ectj1323","DOIUrl":"https://doi.org/10.18321/ectj1323","url":null,"abstract":"A simple and reproducible method of chemical deposition was used to modify carbon nanotubes cobalt and nickel hydroxides. Thus the composites containing 5 and 10 wt.% Co0.5Ni0.5(OH)2(the ratio of hydroxides1:1)were obtained based on the matrix of multiwall carbon nanotubes: non-functionalized (MWCNT) and functionalized (MWCNT-f). The physicochemical properties of the obtained nanocomposites were investigated with a focus on the characteristics that are relevant for use as the electrode materials of supercapacitors. Electrical capacity characteristics (specific electrical capacitance, internal resistance, etc.) of nanocomposites were determined using cyclic voltammetry and impedancemetry. The effect of matrix functionalization and filler content on the electrochemical characteristics of the composites was considered. It is established that the surface of carbon nanotubes allows the accumulation of the charge in the electrical double layer, in particular at high polarization rates. At low rates, the contribution from the pseudo-capacity component increases on the filler nanoparticles, on the surface of channels in nanotubes, and pore surface in hydroxide aggregates. An increase in the specific electrical capacitance of the composites by a factor of 1.5 to the capacitance of MWCNTs was achieved. The schemes of electrode processes in the nanocomposite are proposed, and the nature of redox peaks on voltammetric curves providing the occurrence of the pseudo-capacity component is revealed. Relying on the analysis of impedancemetry results, the equivalent series resistance and the charge transfer resistance are evaluated. An equivalent circuit of the cell with the working composite electrode is proposed, and its major parameters are calculated.","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43637151","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}

引用次数: 1

Hydrogen Production from Coal Industry Methane 煤炭工业甲烷制氢

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Eurasian Chemico-Technological Journal Pub Date : 2022-07-25 DOI: 10.18321/ectj1320

Е. Matus, I. Ismagilov, E. Mikhaylova, Z. Ismagilov

引用次数: 3

Determination of Polycyclic Aromatic Hydrocarbons in Coal from the Kuznetsk Coal Basin by Means of GC/MS and GC/GC-FID 库兹涅茨克煤盆地煤中多环芳烃的GC/MS和GC/GC- fid测定

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Eurasian Chemico-Technological Journal Pub Date : 2022-07-25 DOI: 10.18321/ectj1322

E. Zhuravleva, N. Zhuravleva, E. Mikhaylova, Z. Ismagilov, M. Shashkov, P. A. Dolgushev

{"title":"Determination of Polycyclic Aromatic Hydrocarbons in Coal from the Kuznetsk Coal Basin by Means of GC/MS and GC/GC-FID","authors":"E. Zhuravleva, N. Zhuravleva, E. Mikhaylova, Z. Ismagilov, M. Shashkov, P. A. Dolgushev","doi":"10.18321/ectj1322","DOIUrl":"https://doi.org/10.18321/ectj1322","url":null,"abstract":"Results of the investigation of polycyclic aromatic hydrocarbons (PAHs) content in fine coal powders prepared according to a special procedure within size classes (-0.2+0.1) mm, (-0.1+0.063) mm, (-0.063+0.04) mm, (-0.04) mm for ten different coal ranks (B, D, G, Zh, K, KS, OS, SS, T, A) from the Kuznetsk coal basin are presented. The qualitative and quantitative PAHs content in coal samples was determined by means of GC-MS using a SCION SQ SELECT instrument (Bruker, USA). The maximal Σ14 PAHs content is observed for A rank coal (224.3 mg/kg), KS (201.9 mg/kg) and T (197.8 mg/ kg), and the minimal Σ14 PAHs content is detected for B rank (2.2 mg/kg) for the size fraction (-0.04) mm. The concentration of benz(a)pyrene, which is a strong carcinogen, is within the range of 0.026‒103.1 mg/kg in coal samples under investigation. At the same time, the fraction of benz(a)pyrene is less than 45% of the total amount of detected PAHs, and it is less stable to the effect of the environment than other PAHs. The most stable component in PAHs series is phenanthrene, which was detected in the series of studied coal samples of different fractions (0.061‒43.7 mg/kg). Phenanthrene may be considered a PAHs of priority, and it may be used as a reference compound to evaluate the influence of coal mining and processing on the environment. The group composition of hydrocarbons in coal extracts was determined by means of two-dimensional gas chromatography with flame ionization detection.","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45068311","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}

引用次数: 0

Mechanical Activation as a Method to Regulate Morphology, Texture and Surface Functional Composition of Carbon-Mineral Materials Derived from Sapropel 机械活化法调控水藻衍生碳矿物材料的形态、结构和表面功能组成

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Eurasian Chemico-Technological Journal Pub Date : 2022-07-25 DOI: 10.18321/ectj1325

O. I. Krivonos, O. Belskaya, V. Likholobov

{"title":"Mechanical Activation as a Method to Regulate Morphology, Texture and Surface Functional Composition of Carbon-Mineral Materials Derived from Sapropel","authors":"O. I. Krivonos, O. Belskaya, V. Likholobov","doi":"10.18321/ectj1325","DOIUrl":"https://doi.org/10.18321/ectj1325","url":null,"abstract":"Data on the synthesis of carbon-mineral materials (CMM) through carbonization of native sapropel after preliminary mechanical activation (MA) in the air environment are presented. The effect of MA parameters (time, the size and acceleration of milling bodies) on the fractional composition and morphology of sapropel is investigated. MA for 5‒10 min promotes the dispersion of sapropel particles, while a further increase in treatment time causes their partial agglomeration. It is demonstrated that preliminary MA of native sapropel leads to changes in the texture parameters and acidity of the surface of CMM obtained after the carbonization stage. An increase in specific surface area from 90 to 560 m2g-1 is observed, with an increase in the adsorption pore volume from 0.16 to 0.52 cm3g-1 as a result of an increase in the fraction of micropores in the formed CMM. Despite this fact, CMM samples still contain large pores, and the fraction of meso- and macropores is 70%. In addition, a decrease in pH of the point of zero charge occurs as a consequence of an increase in the content of acidic oxygen-containing groups. The discovered effect is essential for the formation of sapropel-based materials with required properties and for broadening their application area.","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43544421","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}

引用次数: 0

Hydrocarbon Synthesis from CO2 and H2 Using the Ultrafine Iron-Containing Catalytic Systems Based on Carbonized Cellulose 基于碳化纤维素的超细含铁催化体系催化CO2和H2合成碳氢化合物

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Eurasian Chemico-Technological Journal Pub Date : 2022-07-25 DOI: 10.18321/ectj1327

M. Kulikova, M. Chudakova, M. Ivantsov, О.S. Dementyva, A. Maksimov

引用次数: 1

Ignition of Low-Metamorphized Coal with Continuous Lasers at Wavelengths 450 nm and 808 nm 450 nm和808 nm连续激光点火低变质煤

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Eurasian Chemico-Technological Journal Pub Date : 2022-07-25 DOI: 10.18321/ectj1321

B. Aduev, G. Belokurov, I. Liskov, D. Nurmukhametov, Z. Ismagilov

{"title":"Ignition of Low-Metamorphized Coal with Continuous Lasers at Wavelengths 450 nm and 808 nm","authors":"B. Aduev, G. Belokurov, I. Liskov, D. Nurmukhametov, Z. Ismagilov","doi":"10.18321/ectj1321","DOIUrl":"https://doi.org/10.18321/ectj1321","url":null,"abstract":"The paper presents the results of a comparative investigation into the kinetic and energy characteristics of the ignition of microparticles of low-metamorphized coal ranks (lignite coal and high volatile C bituminous coal) under the impact of laser radiation at the wavelengths λ = 450 nm and λ = 808 nm with an exposure time of 1 sec. Coal ignition is carried out only during irradiation. There is no transition to stationary combustion. The ignition delay time decreases monotonically with increasing radiation power density. It is established that the energy costs of ignition of the studied coal ranks may be made more economical by using laser radiation with a wavelength of λ = 450 nm. It is concluded from the results of measuring the energy characteristics of coal ignition that the absorption of radiation has a quantum nature. Two components contribute to the coal particles emission spectra measured at the initial stage of ignition: CO (CO2*) flame and thermal glow associated with emitted carbon particles heated to T>2000 K for both coal ranks. At subsequent stages, only the glow of heated carbon particles with the thermal spectrum at T~2000 K is observed in the spectra.","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41691572","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}

引用次数: 1

A Simple Procedure for Synthesis of Biological Active 4-oxo-4-(quinolin-8-yloxy)but-2-enoic acid 生物活性4-氧代-4-（喹啉-8-氧基）丁-2-烯酸的简单合成方法

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Eurasian Chemico-Technological Journal Pub Date : 2022-03-31 DOI: 10.18321/ectj1148

V. Merkulov, A.I. Almazov, S. Kabiyeva, S. Mantler, V. Konshin

引用次数: 0

The Efficiency of Various Fire Protectants for Wooden Structures 各种木结构防火保护剂的使用效率

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Eurasian Chemico-Technological Journal Pub Date : 2022-03-31 DOI: 10.18321/ectj1146

I. O. Fedotov, A. Sivenkov, Gozel Khasanova

{"title":"The Efficiency of Various Fire Protectants for Wooden Structures","authors":"I. O. Fedotov, A. Sivenkov, Gozel Khasanova","doi":"10.18321/ectj1146","DOIUrl":"https://doi.org/10.18321/ectj1146","url":null,"abstract":"The article deals with the scientific problem of the development and application of various fire protective compositions for wooden structures. Based on the results of theoretical and experimental studies, the authors for the first time attempted to state the influence of the chemical nature and mechanism of flame retardant action on the effectiveness of fire protection means. When assessing the effectiveness of fire protection, the authors paid special attention to the key parameters that determine the fire resistance of wooden structures. The possibility of developing effective fire protection systems, capable not only to provide a certain group of fire protection efficiency but also to influence the parameters of the charring process and the intensity of wood heating temperature is shown. Complex mechanisms of bloating (intumescence) and carbonization in combination with the mechanism of regulating the process of carbonization and wood carbonization, are able to provide the protected material with effective resistance to high temperatures (fire). The use of such types of fire protection allows forming an independent scientific direction associated with the development and use of fire protection systems contributing not only to the effective reduction of fire danger of wood and materials based on it but also to increasing the fire resistance of wooden structures.","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44841678","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}

引用次数: 1

Carbon Nanotubes Synthesized by CCVD Method using Diatomite and Shungite Minerals 利用硅藻土和顺石矿物CCVD法合成碳纳米管

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Eurasian Chemico-Technological Journal Pub Date : 2022-03-31 DOI: 10.18321/ectj1143

M. Nazhipkyzy, P. Harris, A. Nurgain, R. Nemkayeva

引用次数: 0