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Adsorption and flocculation properties of a binary system based on (co)polymers of acrylamide and low- molecular weight amine-containing surfactants in a saline medium 丙烯酰胺(co)聚合物和低分子量含胺表面活性剂二元体系在盐水介质中的吸附和絮凝性能
Q4 Chemistry Pub Date : 2023-09-04 DOI: 10.29235/1561-8331-2023-59-3-193-201
S. V. Bucha, A. Vorobiev, E. V. Laevskaya, P. Vorobiev, N. Krutko, D. V. Cherednichenko, G. V. Bondareva
The process of flocculation of a calcium-magnesium solid phase formed in an aqueous-salt solution with the introduction of calcium-containing precipitants using polyacrylamide, cationic and anionic acrylamide copolymers was studied. With the introduction of polymers, an increase in the dispersion settling rate was observed in the concentration range of 0.5–3.0 mg/g, to a greater extent for the anionic copolymer. In the presence of an amine-containing surfactant, the sedimentation rate increased with the introduction of polymers by a factor of 1.1–1.3 compared to dispersions without surfactants. Using an anionic copolymer as an example, it was shown that the adsorption of amine and the sedimentation rate of dispersion increase with the increase of the polymer molecular weight. It was found that the concentration of the anionic copolymer and the pH of the medium also influence the adsorption of amine. Based on the obtained data, an effective method of water-salt solutions purification from amine-containing surfactants and magnesium salts (purification degree 99.5–99.8 %) that can be used at mining and processing enterprises was developed.
研究了聚丙烯酰胺、阳离子丙烯酰胺共聚物和阴离子丙烯酰胺共聚物引入含钙沉淀剂对水-盐溶液中形成的钙镁固相的絮凝过程。随着聚合物的引入,在0.5 ~ 3.0 mg/g的浓度范围内,分散沉降速率增加,阴离子共聚物的增加幅度更大。在含胺表面活性剂存在的情况下,与不含表面活性剂的分散体相比,聚合物的引入使沉降速率增加了1.1-1.3倍。以阴离子共聚物为例,结果表明,随着聚合物分子量的增加,胺的吸附量和分散体的沉降速率均增加。结果表明,阴离子共聚物的浓度和介质的pH值对胺的吸附也有影响。在此基础上,提出了一种有效的从含胺表面活性剂和镁盐中提纯水盐溶液的方法(纯化度为99.5 ~ 99.8%),可用于矿山和加工企业。
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引用次数: 0
Obtaining hybrid absorbents by grafting acrylamide onto chitosan chains under gamma irradiation γ辐照下丙烯酰胺接枝壳聚糖链制备杂化吸附剂
Q4 Chemistry Pub Date : 2023-09-04 DOI: 10.29235/1561-8331-2023-59-3-242-256
E. K. Fomina, E. V. Grinyuk, I. A. Klimovtsova, D. L. Kudryavsky, A. A. Fedorenko, Y. D. Ivanchikov, D. I. Shiman, I. A. Salnikova, O. Yakimenko
Hybrid hydrogels have been synthesized by radiation grafting of acrylamide to chitosan chains. The structure of the acrylamide-grafted chitosan was examined using FTIR spectroscopy, X-ray diffraction and simultaneous thermal analysis. It has been determined that both hydroxyl and amino groups of the polysaccharide are the grafting centers of growing polyacrylamide chains on the chitosan macromolecules. The effect of the reagents ratio on the sorption and rheological properties of the obtained hydrogels has been studied. Hydrogels based on acrylamide-grafted chitosan were modified chemically by alkaline hydrolysis, and the effect of hydrolysis on the sorption capacity of hydrogels with respect to water and Cu(II) ions was examined.
用丙烯酰胺与壳聚糖链辐射接枝的方法合成了杂化水凝胶。利用红外光谱、x射线衍射和同步热分析对丙烯酰胺接枝壳聚糖的结构进行了表征。确定了多糖的羟基和氨基都是壳聚糖大分子上生长的聚丙烯酰胺链的接枝中心。研究了试剂配比对所得水凝胶吸附性能和流变性能的影响。采用碱性水解法对丙烯酰胺接枝壳聚糖水凝胶进行了化学改性,考察了水解对水凝胶对水和Cu(II)离子吸附能力的影响。
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引用次数: 0
Synthesis of novel rimantadine and adamantane-1-carboxylic acid derivatives with 1,2-azole fragments 含有1,2-唑片段的新型金刚乙胺和金刚烷酸衍生物的合成
Q4 Chemistry Pub Date : 2023-09-04 DOI: 10.29235/1561-8331-2023-59-3-211-224
E. A. Akishina, Е. А. Dikusar, P. Kurman, V. Potkin
Various adamantane derivatives were obtained by the condensation of rimantadine with substituted hydroxy-benzaldehydes, esters and ethers based on them, as well as 1,2-azole-3-carbaldehydes, followed by reduction. Further acylation of derivatives with active amino and hydroxy groups yielded compounds containing two 1,2-azole fragments in one molecule.
金刚乙胺与取代的羟基苯甲醛、酯类、醚类以及1,2-唑-3-乙醛缩合,然后还原得到各种金刚烷衍生物。具有活性氨基和羟基的衍生物的进一步酰化得到在一个分子中含有两个1,2-唑片段的化合物。
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引用次数: 0
Catalytic properties and stability of nickel–tin powder alloys in the process of electrochemical hydrogen evolution from alkali solution 镍锡粉末合金在碱溶液电化学析氢过程中的催化性能及稳定性
Q4 Chemistry Pub Date : 2023-09-02 DOI: 10.29235/1561-8331-2023-59-3-183-192
O. Vrublevskaya, N. Y. Kareva, A. D. Kalesnik, A. Kudaka, Batnasan Bolormaa, G. Sevjidsuren
Ni–Sn powder alloys with a nickel content from 24.4 to 78.5 at.% and from 30.6 to 55.1 at.%, respectively, were synthesized chemically and electrochemically for the use as catalysts for the hydrogen electrochemical reduction (HER) in alkali solution. It was established that the catalytically active surface area of chemically synthesized powders was larger in comparison with electrochemically obtained ones. Ni24.4Sn75.6 powder alloy has the largest surface area. It was found that catalytic properties of chemically synthesized powders increased in the row Ni24.4Sn75.6 < Ni78.5Sn21.5 < Ni. Electrochem ically obtained alloys are inefficient as HER catalysts. It was found that Ni24.4Sn75.6 alloy is characterized by the greater re tention of catalytically active surface area during exploitation in alkali solution in comparison with Ni and Ni78.5Sn21.5 alloy. 
镍含量为24.4 ~ 78.5 at的镍锡粉末合金。%,从30.6%到55.1 %。分别用化学方法和电化学方法合成了三聚吡啶,作为碱溶液中氢电化学还原(HER)的催化剂。结果表明,化学合成的粉末比电化学合成的粉末具有更大的催化活性。Ni24.4Sn75.6粉末合金的表面积最大。结果表明,化学合成的粉末的催化性能以Ni24.4Sn75.6 < Ni78.5Sn21.5 < Ni的顺序递增。电化学获得的合金作为HER催化剂效率不高。结果表明,与Ni和Ni78.5Sn21.5合金相比,Ni24.4Sn75.6合金在碱溶液中具有更大的催化活性表面积。
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引用次数: 0
Sуnthesis of terpene–methacrylic acid copolymers and their effect on the stability of inorganic dispersions in the presence of cationic surfactants Sуnthesis研究了萜烯-甲基丙烯酸共聚物及其在阳离子表面活性剂存在下对无机分散体稳定性的影响
Q4 Chemistry Pub Date : 2023-06-05 DOI: 10.29235/1561-8331-2023-59-2-115-124
A. Vorobiev, S. V. Bucha, E. Vorobieva, N. Krutko, Yu. V. Lipai, M. Astakhova
Copolymers of methacrylic acid and natural terpene monomers (α-pinene; β-pinene; ∆3-karene) with the molecular weight of (0.3–0.5)∙104 and a content of carboxyl groups of 14.5–16.3 % were synthesized. For the synthesized copolymers, hydrodynamic radius and the Kuhn segment, which characterizes flexibility of a polymer chain, were determined, as well as the Huggins constant in aqueous and saline solutions, and concentration regions for formation of supramolecular structures. In the presence of a cationic surfactant (benzetonium chloride, Hyamine), depending on the concentration of copolymers in the system, polymer-surfactant complexes were formed in soluble and insoluble forms. It has been shown that the effectiveness of the stabilizing action of soluble complexes with respect to an aqueous dispersion of calcium carbonate increases with an increase in the content of nonpolar groups in the polymer chain. A cationic surfactant (Hyamine) has been proposed as a precipitant in the method for the quantitative determination of carboxyl-containing polymers in aqueous and saline media. 
甲基丙烯酸与天然萜烯单体(α-蒎烯)的共聚物β蒎烯;合成了分子量为(0.3-0.5)∙104,羧基含量为14.5 - 16.3%的∆3-karene。对于合成的共聚物,确定了流体动力学半径和表征聚合物链柔韧性的库恩段,以及水和盐水溶液中的哈金斯常数,以及形成超分子结构的浓度区域。在阳离子表面活性剂(苯并氯铵,Hyamine)存在的情况下,根据体系中共聚物的浓度,聚合物-表面活性剂络合物以可溶性和不溶性形式形成。研究表明,随着聚合物链中非极性基团含量的增加,水溶性配合物对碳酸钙水分散体的稳定作用的有效性也随之增加。提出了一种阳离子表面活性剂(Hyamine)作为沉淀剂用于定量测定含水和盐水介质中含羧基聚合物的方法。
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引用次数: 0
Extraction of amitraz and its metabolites with organic solvents 有机溶剂萃取氨咪唑及其代谢物
Q4 Chemistry Pub Date : 2023-06-05 DOI: 10.29235/1561-8331-2023-59-2-139-149
A. G. Polonevich, S. M. Leschev, V. A. Bulhakava, L. Belysheva
The distribution constants of amitraz and its three main metabolites (DMFF, DMF, DMA) for water–organic solvent (n-hexane, toluene, dichloromethane, chloroform) extraction systems were estimated. Based on the analysis of the substances distribution in the studied systems, it was established that dichloromethane is the optimal choice for amitraz and its metabolites liquid-liquid extraction for method development for their simultaneous determination in honey. Amitraz stability study in water-acetonitrile solutions with various additives demonstrated that 50 mM ammonia solution in water– acetonitrile mixture (1 : 1, vol.) should be used as solvent for the samples final solutions. 
测定了咪唑及其3种主要代谢物(DMFF、DMF、DMA)在水-有机溶剂(正己烷、甲苯、二氯甲烷、氯仿)萃取体系中的分布常数。通过对各体系物质分布的分析,确定了二氯甲烷为同时测定蜂蜜中阿米特拉兹及其代谢物液-液萃取方法的最佳选择。不同添加剂在水-乙腈溶液中的稳定性研究表明,在水-乙腈混合物(1:1,vol.)中,50mm氨水溶液可作为样品最终溶液的溶剂。
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引用次数: 0
Textural properties of ordered nanoporous silica synthesized on mesogenic template 介晶模板合成有序纳米多孔二氧化硅的结构特性
Q4 Chemistry Pub Date : 2023-06-05 DOI: 10.29235/1561-8331-2023-59-2-125-138
T. F. Kouznetsova, E. Kopysh, L. Kulbitskaya, D. Jumaeva, A. Ivanets
Several synthesis routes have been developed and correlations between the variables of the synthesis procedure and the physicochemical properties of nanoporous silica materials of the MCM-48 type deposited by the template method in the presence of a low-valent iron (II) cation have been investigated. Changes in the structure of silica mesoporous framework, its textural properties and the degree of energy inhomogeneity of the surface were studied depending on the Fe/Si molar ratio, pH values (4 and 9 units), stepwise calcination (673 and 923 K) and extraction of cetylpyridinium template with ethanol from xerogels. 
研究人员开发了几种合成路线,并研究了模板法沉积的MCM-48型纳米多孔二氧化硅材料在低价铁(II)阳离子存在下的物理化学性质与合成过程变量之间的相关性。研究了Fe/Si摩尔比、pH值(4和9单位)、分步煅烧(673和923 K)和乙醇萃取十六烷基吡啶模板对硅介孔骨架结构、结构性能和表面能量不均匀程度的影响。
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引用次数: 0
Lipophilicity of BODIPY fluorophores and their distribution in 1-octanol–water system BODIPY荧光团的亲脂性及其在1-辛醇-水体系中的分布
Q4 Chemistry Pub Date : 2023-06-05 DOI: 10.29235/1561-8331-2023-59-2-150-161
M. Horetski, N. Frolova, V. Shkumatov
The work covers synthesis and lipophilicity estimation of several BODIPY dyes. For these compounds, the distribution between 1-octanol and water layers is experimentally described and the corresponding partition coefficients LogP are calculated. The experimental LogP values are compared with popular fragment-based methods XLopP3, ALogPS, WLogP, SILICOS-IT and MLogP. Additionally, the hydrophobic and polar surface areas are found with quantum-mechanical calculations. That allowed to find a correlation between the LogP coefficient and the molecular surface topology, as well as to determine the corresponding incremental values of the methyl, acetyl, and phenyl substituents. 
研究了几种BODIPY染料的合成及其亲脂性评价。对于这些化合物,实验描述了1-辛醇和水层之间的分布,并计算了相应的分配系数LogP。实验LogP值与流行的基于片段的方法XLopP3、ALogPS、WLogP、SILICOS-IT和MLogP进行了比较。此外,疏水和极性表面积被发现与量子力学计算。这样可以找到LogP系数与分子表面拓扑结构之间的相关性,并确定相应的甲基、乙酰基和苯基取代基的增量值。
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引用次数: 0
Glauconite-containing overburden is a promising raw material for the synthesis of glasses for various purposes 含海绿石覆岩是一种很有前途的合成各种用途玻璃的原料
Q4 Chemistry Pub Date : 2023-06-05 DOI: 10.29235/1561-8331-2023-59-2-169-176
S. E. Barantseva, Y. A. Klimosh, A. Pospelov, I. M. Azaranka, M. Kurylovich
The results of a study on the use of glauconite-containing overburden rocks of the Novodvorskoye deposit of the Pinsk district of the Brest region to produce glasses for various purposes are presented. The compositions of raw materials in the system «glauconite-containing rock – chalk – iron oxide – soda ash» have been developed, the limiting amount of the raw components and basic oxides in glasses have been optimized. It has been established that the main criterion for obtaining high-quality glasses is a rational combination of refractory and low-melting oxides, which ensures the homogeneity of glasses, working viscosity, the ability to form in various ways, the absence of a tendency to crystallization, black color in the mass, as well as a complex of satisfactory physical and chemical properties. The results of the study confirmed the prospects of using the glauconite-containing overburden for the synthesis of glasses for various purposes, which will contribute to the rational use of natural resources and associated minerals of the Novodvorskoye deposit of the Republic of Belarus, and will improve the environmental situation in the areas adjacent to the deposit. 
本文介绍了利用布列斯特地区Pinsk地区Novodvorskoye矿床含海绿石覆岩生产各种用途玻璃的研究结果。研究了“含海绿石-白垩-氧化铁-纯碱”体系的原料组成,优化了玻璃中原料组分和碱性氧化物的限量。确定了获得高质量玻璃的主要标准是耐火材料和低熔点氧化物的合理组合,这保证了玻璃的均匀性、工作粘度、以各种方式形成的能力、没有结晶倾向、质量呈黑色,以及具有令人满意的物理和化学性能的复合体。研究结果证实了利用含海绿石覆岩合成各种用途玻璃的前景,这将有助于合理利用白俄罗斯共和国新沃斯科耶矿床的自然资源和伴生矿物,并将改善该矿床附近地区的环境状况。
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引用次数: 0
Rheological properties and group chemical composition of oxidized bitumen in the presence of fibrous materials of various structures 不同结构的纤维材料存在下氧化沥青的流变特性和基团化学组成
Q4 Chemistry Pub Date : 2023-06-05 DOI: 10.29235/1561-8331-2023-59-2-162-168
O. V. Luksha, N. P. Krut’ko, V. M. Chernetskaya
The rheological properties of oxidized bitumen in the presence of fibrous materials based on cellulose and chrysotile asbestos used as stabilizing additives in the production of crushed stone-mastic asphalt concrete mixtures have been studied. It has been established that the supramolecular structure of fibers characterizing the interaction between macromolecules largely determines the effectiveness of their structuring action for oxidized bitumen. Thus, the introduction of cellulose fiber leads to an increase in the ability of the bitumen colloidal structure to the simultaneous occurrence of elastic and plastic components of deformation. This is due to the uniform distribution of the fiber in the dispersion medium of bitumen due to the penetration of hydrocarbon components of bitumen into the interfibrillary space of cellulose and the rupture of hydrogen bonds between hydroxyl groups. Тhe presence of strong structural bonds between chrysotile-asbestos macromolecules prevents the formation of strong reinforcing mesh in bitumen oils. As a result, the values of the structural and rheological parameters Pk1, Pk2 and Pm of the bitumen/chrysotile-asbestos composition are 1.5–2 times lower compared to the values for the bitumen/cellulose composition. The results of the study of the group composition and structural-rheological properties of bitumen compositions after heating at T = 163 °C indicate a higher stability of the bitumen-cellulose structure to the processes of thermal oxidative degradation compared to the structure formed in the bitumen/chrysotile-asbestos composition. By the method of thin-layer chromatography, it was found that the concentration of oils in the bitumen/chrysotile-asbestos composition is higher as compared to the bitumen/cellulose composition, indicating that the weakening of rheological properties and thermal stability in the presence of chrysotile-asbestos is not related to the microstructure of its fibers, which, according to some researchers, is prone to selective diffusion of oils into the capillaries of fibrils. 
研究了以纤维素和温石棉为基础的纤维材料作为稳定添加剂用于生产碎石沥青混凝土混合料时氧化沥青的流变特性。研究表明,表征大分子间相互作用的纤维超分子结构在很大程度上决定了其对氧化沥青结构作用的有效性。因此,纤维素纤维的引入导致沥青胶态结构对弹塑性组分同时发生变形的能力增加。这是由于沥青中的碳氢化合物组分渗透到纤维素的纤维间隙中,羟基之间的氢键断裂,使纤维在沥青的分散介质中分布均匀。Тhe温石棉-石棉大分子之间的强结构键的存在阻止了沥青油中强增强网的形成。结果,沥青/温石棉组合物的结构和流变参数Pk1、Pk2和Pm值比沥青/纤维素组合物的值低1.5-2倍。在T = 163℃加热后沥青组合物的基团组成和结构流变特性研究结果表明,与沥青/温石棉-石棉组合物形成的结构相比,沥青-纤维素结构在热氧化降解过程中具有更高的稳定性。通过薄层色谱法发现,沥青/温石棉组分中油的浓度高于沥青/纤维素组分,这表明温石棉存在时流变性能和热稳定性的减弱与其纤维的微观结构无关,一些研究人员认为,温石棉纤维的微观结构容易使油选择性扩散到纤维的毛细血管中。
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引用次数: 0
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Proceedings of the National Academy of Sciences of Belarus, Chemical Series
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