Chimica Techno Acta最新文献_第6页

Decomposition of light hydrocarbons on a Ni-containing glass fiber catalyst 轻碳氢化合物在含镍玻璃纤维催化剂上的分解

Chimica Techno Acta Pub Date : 2023-08-08 DOI: 10.15826/chimtech.2023.10.3.06

M. Popov, M. Chudakova, P. B. Kurmashov, A. Bannov, A. V. Kleimenov, Prof. N. Uvarov, Prof. E. Aubakirov

引用次数: 0

Study on methylene blue adsorption using cashew nut shell-based activated carbon 腰果壳基活性炭吸附亚甲基蓝的研究

Chimica Techno Acta Pub Date : 2023-08-07 DOI: 10.15826/chimtech.2023.10.4.01

H. Tran, Dinh Quan Nguyen

{"title":"Study on methylene blue adsorption using cashew nut shell-based activated carbon","authors":"H. Tran, Dinh Quan Nguyen","doi":"10.15826/chimtech.2023.10.4.01","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.4.01","url":null,"abstract":"Adsorption is a widely used technique for the treatment of wastewater containing dyes, which are pollutants that can have serious impacts on the aquatic ecosystems. In this work, activated carbon (AC) was prepared from cashew nut shell (CNS) and used to adsorb methylene blue (MB) from solution. The CNS AC was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption isotherms. The adsorption behavior of MB on CNS AC was investigated by varying the initial solution pH, adsorbent dosage, and initial MB concentration. The results showed that the CNS AC was effective for MB removal, with an adsorption capacity of 24.8 mg/g. The adsorption nature of MB onto the CNS AC surface was explored by analyzing the experimental data using isotherm and kinetic models. The Freundlich and Dubinin-Radushkevich (D-R) isotherm models showed good agreement with the experimental adsorption equilibrium results. The mean adsorption energy was found to be 22.4 kJ/mol, indicating chemical adsorption. The adsorption of MB on the CNS AC followed pseudo-second-order kinetics. This study demonstrates the potential application of CNS AC for MB removal.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43509206","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

The effect of ammonia activation on the desalination potential of natural zeolite 氨活化对天然沸石脱盐潜力的影响

Chimica Techno Acta Pub Date : 2023-08-04 DOI: 10.15826/chimtech.2023.10.3.05

A. Kenessova, A. Rakhym, Bagashar B. Zhaksybay, G. Seilkhanova

{"title":"The effect of ammonia activation on the desalination potential of natural zeolite","authors":"A. Kenessova, A. Rakhym, Bagashar B. Zhaksybay, G. Seilkhanova","doi":"10.15826/chimtech.2023.10.3.05","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.3.05","url":null,"abstract":"Despite the abundance of water bodies on Earth, there is a limited amount of potable water. Therefore, the desalination process is of great interest. Adsorption of the main contaminants of saline water (Na+, K+, Cl– ions) is an alternative process of desalination. In the present work, a sorbent based on natural zeolite (NZ) modified with ammonium chloride (NH4Cl) is obtained and the effect of modification on the removal of Na+ and K+ ions from saline water is studied. According to the Brunauer-Emmett-Teller (BET) analysis, the modification of zeolite with NH4Cl leads to an increase in its surface area (7.85 to 8.09 m2/g). According to the results of the cation exchange capacity (CEC) determination, the modification leads to a decrease in total CEC of zeolite (431.67±29.01 to 300.88±31.86 meq/100 g). According to the obtained results, ammonia modification enhances the adsorption ability of NZ to extract Na+ and K+ ions from saline water. The extraction degree (E) of Na+ ions by NH4-Z increases from 7.93±1.63 to 10.44±1.52%, while for K+ ions it increases about 2 times (27.69±2.45 to 56.46±3.71%). These results indicate that the ammonia-modified NZ can potentially be used as a desalination agent for the removal of Na+ and K+ ions from saline water.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44992556","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

High purity β-Bi2O3 preparation by thermal decomposition of tartrates 酒石酸盐热分解法制备高纯度β-Bi2O3

Chimica Techno Acta Pub Date : 2023-08-03 DOI: 10.15826/chimtech.2023.10.3.04

E. Timakova, Tatiana E. Timakova, Liubov I. Afonina

引用次数: 0

Synthesis of nanopowders by the glycine-nitrate method in the In-Dy-O system 甘氨酸-硝酸盐法在in - dy - o体系中合成纳米粉体

Chimica Techno Acta Pub Date : 2023-07-31 DOI: 10.15826/chimtech.2023.10.3.03

T. Malinovskaya, S. Ghyngazov, Alexander I. Aparnev, V. Zhek

引用次数: 0

Influence of anionic surfactant on stability of nanoparticles in aqueous solutions 阴离子表面活性剂对纳米颗粒水溶液稳定性的影响

Chimica Techno Acta Pub Date : 2023-07-27 DOI: 10.15826/chimtech.2023.10.3.02

Dmitry O. Zelentsov, Y. Petrova, Alexander V. Korobkin, A. Ivanova, A. Cheremisin, I. Shanenkov, A. Pak, Y. Mateyshina

{"title":"Influence of anionic surfactant on stability of nanoparticles in aqueous solutions","authors":"Dmitry O. Zelentsov, Y. Petrova, Alexander V. Korobkin, A. Ivanova, A. Cheremisin, I. Shanenkov, A. Pak, Y. Mateyshina","doi":"10.15826/chimtech.2023.10.3.02","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.3.02","url":null,"abstract":"Dispersion and aggregation of nanoparticles in aqueous solutions are important factors for safe and effective application of nanoparticles, for instance, in the oil industry. As conventional oil reserves are depleted, it is necessary to advance chemical enhanced oil recovery (cEOR) techniques to develop unconventional oil reservoirs. Nanoparticles modified by surfactants can be a promising reagent in cEOR. These nanomaterials can reduce interfacial tension and change the wettability of reservoir rock, which leads to an increase in oil recovery. However, the application of nanoparticles is limited by their substantial aggregation in aqueous solutions. The purpose of this work is to select nanoparticles for obtaining stable sols in water in the presence of an anionic surfactant and to optimize the conditions (pH) for further modifying the nanoparticles with the anionic surfactant. Sodium dodecyl sulfate (SDS) is used as an anionic surfactant. The aggregation of oxide and carbon nanoparticles in water and anionic surfactant solutions was studied by laser diffraction, dynamic and electrophoretic light scattering methods. Most of the studied nanoparticles in water form aggregates with bi-, three- and polymodal particle size distributions. TiO2 nanoparticles obtained by plasma dynamic synthesis form the most stable sols in anionic surfactant solutions. The range of 5–7 pH is defined as optimal for their modification with surfactants. The stability of carbon nanoparticles in aqueous solutions increases significantly in the presence of a surfactant. The obtained results form the basis for further research on the modification of marked nanoparticles in surfactant solutions.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44040858","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

Complexes of polyvinylpyrrolidone and polyethylene glycol with palladium(II) ions: characterization and catalytic activity 聚乙烯吡咯烷酮和聚乙二醇与钯离子的配合物:表征和催化活性

Chimica Techno Acta Pub Date : 2023-07-24 DOI: 10.15826/chimtech.2023.10.3.01

D. Akbayeva, I. Smagulova, Azhar Timurkyzy, B. Bakirova

引用次数: 0

Advancements in N-heterocyclic carbenes (NHCs) catalysis for benzoin reactions: A comprehensive review from past to present N-杂环卡宾（NHCs）催化安息香反应的研究进展

Chimica Techno Acta Pub Date : 2023-07-04 DOI: 10.15826/chimtech.2023.10.2.14

P. Noppawan, Baramee Phungpis, Kanokkan Worawut

引用次数: 0

Mechanochemical recrystallization: Forgotten basics and new possibilities 机械化学再结晶:被遗忘的基础和新的可能性

Chimica Techno Acta Pub Date : 2023-06-02 DOI: 10.15826/chimtech.2023.10.2.13

F. Urakaev, N. Khan, A. Niyazbayeva, Dinar N. Zharlykasimova, M. Burkitbayev

{"title":"Mechanochemical recrystallization: Forgotten basics and new possibilities","authors":"F. Urakaev, N. Khan, A. Niyazbayeva, Dinar N. Zharlykasimova, M. Burkitbayev","doi":"10.15826/chimtech.2023.10.2.13","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.2.13","url":null,"abstract":"The task of this article is to update, develop and introduce into scientific practice the method of \"mechanochemical recrystallization\" in solid-phase systems with small additives of the liquid phase of the solvent and solid-phase precursors to stabilize the formed nanoparticles. The essence of this method is shown using the example of mechanical activation of the S–AgNO3–NH4X system, where X = Cl, Br, I, with the addition of dimethyl sulfoxide (DMSO), and the resulting mechanochemical synthesis of sulfur-containing nanocomposites S/AgX with the controlled content of sulfur nanoparticles (nanosulfur). The predetermined content of nanosulfur in nanocomposites is ensured by a continuous process of dissolution-crystallization (recrystallization) of starting sulfur in the DMSO medium in a mechanochemical reactor. The proposed technical solution made it possible to obtain S/AgX nanocomposites by a single mechanical treatment of powder precursors – AgNO3, NH4Х, NH4NO3 (diluent), commercial sulfur and DMSO in planetary ball mills with various milling tools. The method also includes washing the water-soluble components of mechanosynthesis.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44158999","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

Improvement of protective oxide layers formed by high-frequency plasma electrolytic oxidation on Mg-RE alloy with LPSO-phase LPSO相Mg-RE合金高频等离子体电解氧化保护层的改进

Chimica Techno Acta Pub Date : 2023-05-29 DOI: 10.15826/chimtech.2023.10.2.12

A. O. Cheretaeva, P. Glukhov, M. R. Shafeev, Alyona G. Denisova, E. D. Borgardt, A. Polunin, A. Katsman, M. M. Krishtal

{"title":"Improvement of protective oxide layers formed by high-frequency plasma electrolytic oxidation on Mg-RE alloy with LPSO-phase","authors":"A. O. Cheretaeva, P. Glukhov, M. R. Shafeev, Alyona G. Denisova, E. D. Borgardt, A. Polunin, A. Katsman, M. M. Krishtal","doi":"10.15826/chimtech.2023.10.2.12","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.2.12","url":null,"abstract":"Oxide layers on Mg97Y2Zn1 magnesium alloy with strengthening LPSO-phase were formed by plasma electrolytic oxidation (PEO) in bipolar mode with frequency variation of forming current pulses (50 and 500 Hz) and addition of sodium aluminate or sodium silicate to alkali phosphate fluoride electrolyte. Microstructure, chemical and phase composition, corrosion and mechanical properties of the oxide layers formed were investigated. With increasing current frequency for both electrolytes, an increase in homogeneity of the oxide layers structure and a decrease in their porosity and fracturing at constant thickness were recorded. The oxide layers formed at 500 Hz even with some decrease in hardness have better adhesive strength and 2 orders of magnitude higher short-term corrosion resistance values. PEO of Mg-alloy with LPSO-phase in the electrolyte with addition of sodium aluminate in combination with increased pulse frequency (500 Hz) allows forming the best-quality uniform oxide layer with high hardness, adhesive strength and corrosion resistance properties. The use of electrolyte with addition of sodium silicate reduced the adhesive strength by 1.5 times and brought down the long-term corrosion resistance of oxide layers by an order of magnitude, as compared with the electrolyte with sodium aluminate. The reason for a significant improvement in the complex of protective properties of the oxide layers with an increase in the current pulse frequency is supposed to be a decrease in the power and duration of individual microarc discharges with simultaneous increase in their number per unit oxidized area.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44129639","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