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The Influence of the Reaction Conditions on the Size of Silver Nanoparticles in Carey Lea’s Concentrated Sols 反应条件对Carey Lea 's浓缩溶胶中银纳米粒子尺寸的影响
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0190
S. Vorobyev, Maksim N. Likhatski, A. Romanchenko, Timur Y. Ivanenko, Diana A Masharova, M. Volochaev, Y. Mikhlin
The reaction of reduction solution of Ag (I) by Fe (II) citrate complex was studied herein. This allows you to receive silver nanoparticles with high stability with a concentration above 60 g/l. It was determined that the nanoparticles size depends on the injection rate, mixing rate, reagent concentration, pH and some post-synthetic operations on the average size of nanoparticles. It was shown that decreasing the concentration of Ag (I) and increasing the concentration of stabilizer also bringing pH to 7 lead to small and uniform particles. Optimal conditions were found that made it possible to reduce particle size and reduce the concentration of reagents by 33 % in the results. According to XPS, TEM, DLS and FTIR datas, nanoparticles of metallic silver with a size of 6.5±1.8 nm were obtained, which stabilized by the product of partial decay of the citrate ion
研究了柠檬酸铁(II)配合物与银(I)还原溶液的反应。这使您可以接收浓度高于60克/升的高稳定性银纳米颗粒。实验结果表明,纳米颗粒的大小取决于注射速率、混合速率、试剂浓度、pH和一些合成后操作对纳米颗粒的平均大小的影响。结果表明,降低Ag (I)的浓度,增加稳定剂的浓度,使pH值达到7,可以得到小而均匀的颗粒。找到了最优的条件,可以使结果中粒径减小,试剂浓度降低33%。通过XPS、TEM、DLS和FTIR等测试,得到了尺寸为6.5±1.8 nm的金属银纳米粒子,该粒子由柠檬酸盐部分衰变产物稳定
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引用次数: 0
Influence Different Methods of Mechanical Activation on Yield Extractive Substances from Pine Bark 不同机械活化方法对松皮萃取物得率的影响
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0196
E. V. Veprikova, V. A. Ionin, M. Belash, A. M. Skripnikov, A. V. Levdanskii, O. Taran
The effect pine bark activation by explosive autohydrolysis and mechanical treatment in a ball mill on the yield and properties of resinous and pectin substances and β-sitosterol was studied. Pine bark physicochemical properties after its activation by a batch of methods were studied. It was shown that the activation of pine bark by explosive autohydrolysis result in the highest increase in the yield of extractive substances. The conditions providing the highest yield of target products from the activated pine bark were determined: for resinous substances and β-sitosterol – the use of 0.5 n alkali solution; for pectin substances – the use of hydrochloric acid
研究了松皮爆炸自水解活化和球磨机机械处理对松皮树脂、果胶物质和β-谷甾醇产率和性质的影响。研究了松皮经多种方法活化后的理化性质。结果表明,爆炸自水解法活化松皮可使松皮中提取物质的收率提高最多。确定了从活化松皮中提取目标产物收率最高的条件:对于树脂物质和β-谷甾醇-使用0.5 n碱溶液;对于果胶物质-使用盐酸
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引用次数: 1
Adsorption-Photometric and Test-Determination of Fe(III) in Natural Water Using Silica Lyer-by-Lyer Modified with Polyhexamethylene Guanidine and Ferron 用聚六亚甲基胍和铁改性二氧化硅逐层吸附光度法测定天然水中的铁(III)
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-09-01 DOI: 10.17516/1998-2836-0188
S. Didukh-Shadrina, O. Buyko, V. Losev
Silica based adsorbent sequentially modified with polyhexamethylene guanidine and 7-iodine-8-hydroxyquinoline-5-sulfonic acid (Ferron) was proposed for adsorption-photometric and test-determination of Fe(III) in natural water. During adsorption of Fe(III) from solutions with pH 2.0-3.5 adsorbent became green colored. Formation of green-colored surface complex of Fe(III) with Ferron with the maximum in diffuse reflectance spectrum at 600 nm was used for developing the procedure of its adsorption-photometric determination. Detection limit calculated by 3s-criterion was 0.03 μg/0.1 g of adsorbent (3 μg/L if the adsorption was carried out from 10 mL of solution); the analytical range was 10 – 220 μg/L. Test-method was proposed for quick visual determination of Fe(III) in natural water in the variant of test-scale. Developed procedures were tested for determination of iron in natural river water of Krasnoyarskii kray and mineral water “Zagorie”
提出了以聚六亚甲基胍和7-碘-8-羟基喹啉-5-磺酸(铁)依次修饰的二氧化硅基吸附剂,用于天然水中铁(III)的吸附光度测定。在pH为2.0 ~ 3.5的吸附剂中,Fe(III)在吸附过程中呈绿色。利用Fe(III)与铁形成的漫反射光谱最大值为600 nm的绿色表面配合物,建立了吸附光度法测定Fe(III)的方法。3s标准计算的检出限为0.03 μg/0.1 g吸附剂(从10 mL溶液中吸附为3 μg/L);分析范围为10 ~ 220 μg/L。提出了一种在不同试验尺度下快速测定天然水中铁(III)的试验方法。对克拉斯诺亚尔斯克克天然河水和扎戈里矿泉水中铁的测定方法进行了试验。
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引用次数: 1
Depolymerization of Pine Ethanol Lignin in the Medium of Supercritical Ethanol in the Presence of Catalysts NiCu/SiO₂ and NiCuMo/SiO₂ NiCu/SiO₂和NiCuMo/SiO₂催化剂作用下松树乙醇木质素在超临界乙醇介质中的解聚
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-06-01 DOI: 10.17516/1998-2836-0179
А.В. Мирошникова, С.В. Барышников, Ю.Н. Маляр, В. А. Яковлев, О.П. Таран, Л. Дьякович, Борис Николаевич Кузнецов, A. Miroshnikova, S. V. Baryshnikov, Y. Malyar, V. Yakovlev, O. Taran, L. Djakovitch, B. Kuznetsov
The regularities of thermocatalytic transformation of pine ethanol lignin in supercritical ethanol in the presence of catalysts NiCu/SiO₂ and NiCuMo/SiO2 in the temperature range 250–400 °C were established. The composition and structure of ethanol lignin, liquid and solid products of its conversion were studied by methods of elemental analysis and gel-permeating chromatography (GPC). The composition of gaseous products – by method of gas chromatography. At the process temperature of 250 °C the catalysts do not have a significant effect on conversion of ethanol lignin. The maximal yield of liquid products (83.5 wt. %) was obtained at temperature 300 °C in the presence of catalyst NiCuMo/SiO₂ containing 8.8 wt. % of molybdenum. At temperature 350 °C NiCu/SiO₂ and NiCuMo/SiO2 catalysts contribute to the almost complete conversion of ethanol lignin into liquid and gaseous products, and the yield of solid products does not exceed 1 wt. %. In liquid products of catalytic conversion there is a decrease in the atomic ratio of O/C and the increase of H/C atomic ratio as compared to initial ethanol lignin due to catalytic intensification of reactions of deoxygenation and hydrogenation of lignin and products of its depolymerization. According to GPC data on the curves of molecular mass distribution (MMD) of liquid products of thermocatalytic conversion of ethanol lignin at 300 °C there are peaks with highs at 160 and 380 Da, probably related to guiacyle monomers and dimmers, respectively. From the comparison of MMD of liquid products obtained by ethanol lignin depolymerization at 300 °C over catalysts NiCu/SiO₂ and NiCuMo/SiO₂ it follows, that the introduction of molybdenum in the catalyst promotes the formation of monomeric guaiacyl products
研究了在250 ~ 400℃范围内NiCu/ SiO2和NiCuMo/SiO2催化剂存在下,超临界乙醇中松乙醇木质素的热催化转化规律。采用元素分析和凝胶渗透色谱法(GPC)研究了乙醇木质素的组成和结构及其转化的液体和固体产物。气相色谱法测定气体产物的组成。在250℃的工艺温度下,催化剂对乙醇木质素的转化无显著影响。在含钼量为8.8 wt. %的NiCuMo/SiO₂催化剂存在下,反应温度为300℃时,液相产物的最大产率为83.5 wt. %。在350℃的温度下,NiCu/ SiO2和NiCuMo/SiO2催化剂使乙醇木质素几乎完全转化为液体和气体产物,固体产物的收率不超过1wt . %。在催化转化的液体产物中,由于木质素的脱氧和加氢反应及其解聚产物的催化强化,与初始乙醇木质素相比,O/C原子比降低,H/C原子比增加。根据300℃下乙醇木质素热催化转化液产物分子质量分布(MMD)曲线的GPC数据,在160和380 Da处存在峰值,可能分别与导环单体和二聚物有关。通过比较300℃下乙醇木质素解聚液体产物在NiCu/SiO₂和NiCuMo/SiO₂催化剂上的MMD可知,在催化剂中引入钼促进了单体愈创木酰产物的形成
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引用次数: 0
Application of the CHNS-Analysis for Studying of Polyoxometallates and Ionic Liquids in the Catalytic Systems chns分析在多金属氧酸盐及离子液体催化体系研究中的应用
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-06-01 DOI: 10.17516/1998-2836-0177
O. S. Koscheeva, L. I. Kuznetsova, N. Kuznetsova
The method of CHNS-analysis in combination with ³¹P NMR and UV-VIZ spectroscopy was used to study polyoxometallates and ionic liquids as components of liquid-phase catalytic systems. The composition of imidazolium and TBA salts of tungstоphosphate anions active in the olefin oxidation with H₂O₂ was determined. A method for quantification of [BMIm]Br, Bu₄NBr, Bu₄NHSO₄ in solutions using the CHNS-analysis is proposed. The capabilities of the technique with applying ionic liquids to an inert porous support are evaluated. Using the obtained results, the effect of ionic liquids in combination with a Pt/C catalyst and H₃PMo₁₂O₄₀ heteropolyacid in the oxidation of cyclohexane with О₂-Н₂ gas mixture was determined
采用chns -分析结合³¹P NMR和UV-VIZ光谱的方法研究了多金属氧酸盐和离子液体作为液相催化体系的组分。测定了在烯烃h2o2氧化反应中活性的咪唑盐和钨磷酸盐阴离子TBA盐的组成。提出了一种用chns分析法定量测定溶液中[BMIm]Br、Bu₄NBr、Bu₄NHSO₄的方法。评价了该技术在惰性多孔载体上应用离子液体的能力。利用所得结果,研究了离子液体与Pt/C催化剂和H₃PMo₁₂O₄₀杂多酸结合使用对О₂-Н₂混合气氧化环己烷的影响
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引用次数: 0
Crush and Acid Resistance of Microsphere Narrow Fractions from Fly Ash as the Basis of Composite Materials 粉煤灰微球窄组分作为复合材料基础的抗压耐酸性能
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-06-01 DOI: 10.17516/1998-2836-0174
G. Akimochkina, E. S. Rogovenko, E. Fomenko
The crush test and acid resistance of microsphere narrow fractions with average diameter dav of 5, 8 and 25 μm of the SiO2–Al2O3–FeO system and with dav of 4 and 10 μm the CaO–SiO2–Al2O3– FeO system separated from fly ash from pulverized combustion of Ekibastuz and Irsha-Borodinsky coals were studied. It has been established that all investigated ash fractions of both raw materials are characterized by high strength: microspheres of a larger narrow fraction with dav = 25 μ m a re not destroyed by compressive loading at pressures up to 51.7 MPa, dispersed narrow fractions of microspheres with dav ≤ 10 μm – up to 68.9 MPa. Microsphere narrow fractions with aluminosilicate composition have satisfactory acid resistance; the weight loss after treatment with 15 % hydrochloric acid at 65 °C for 30 minutes was 10–15 wt. %
研究了Ekibastuz和irshaborodinsky煤燃烧后粉煤灰中SiO2-Al2O3-FeO体系平均粒径为5、8和25 μm的微球窄馏分,以及粒径为4和10 μm的CaO-SiO2-Al2O3 - FeO体系的破碎试验和耐酸性能。结果表明,两种原料的灰分均具有较高的强度特征:在51.7 MPa压力下,dav = 25 μm的较大窄段微球不会被压缩载荷破坏,dav≤10 μm的分散窄段微球在68.9 MPa压力下不会被破坏。铝硅酸盐组成的微球窄馏分具有良好的耐酸性能;用15%盐酸在65°C下处理30分钟后,体重减轻10-15 wt. %
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引用次数: 0
Optimization of Conditions for Obtaining Stable Hydrosols of Magnetite Nanoparticles 制备磁性纳米颗粒稳定水溶胶的条件优化
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-03-01 DOI: 10.17516/1998-2836-0165
T. Trofimova, S. Saykova, D. Karpov, D. I. Chistyakov, A. Pavlikov
The work is devoted to the study of the influence of reaction parameters on the qualitative and quantitative composition of magnetite nanoparticles. The method of their synthesis is optimized using the method of mathematical planning and processing of experimental data. The mathematical model is obtained. It was established that the molar ratio of iron (II) and (III) ions, the time of preliminary boiling of distilled water for preparing solutions, the presence of an inert atmosphere of nitrogen, as well as an excess of alkali affect the formation of a stoichiometric product. Monophase magnetite nanoparticles with an average diameter of 8-12 nm were obtained under optimal conditions. The product is characterized by the methods of transmission electron microscopy and X-ray phase analysis. The effect of pretreatment of magnetite nanoparticles with solutions of strong mineral acids on the stability of its hydrosols has been studied by dynamic and electrophoretic light scattering. It was established that the best stabilization is achieved by pretreatment of magnetite with a solution of perchloric acid
研究了反应参数对纳米磁铁矿的定性和定量组成的影响。采用数学规划和实验数据处理的方法优化了它们的合成方法。建立了数学模型。确定了铁(II)和(III)离子的摩尔比、蒸馏水预备沸腾的时间、氮气惰性气氛的存在以及过量的碱对化学计量产物的形成有影响。在最佳条件下,制备了平均直径为8 ~ 12 nm的单相磁铁矿纳米颗粒。通过透射电子显微镜和x射线相分析对产物进行了表征。采用动态光散射法和电泳光散射法研究了强矿物酸溶液预处理磁铁矿纳米颗粒对其水溶胶稳定性的影响。结果表明,用高氯酸溶液对磁铁矿进行预处理,稳定效果最好
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引用次数: 0
Enterosorbents from Abies Bark and their Therapeutic and Preventive Properties in Experimental Escherichiosis of Animals 冷杉树皮肠吸收剂及其对实验性动物大肠杆菌病的治疗和预防作用
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2020-03-01 DOI: 10.17516/1998-2836-0158
S. Kuznetsova, G. Skvortsova, A. A. Moroz, S. Schislenko, I. V. Korolkova, N. V. Chesnokov, B. Kuznetsov
Methods have been developed for the preparation of enterosorbents by treating crushed abies bark with the 1.5% aqueous of NaOH solution or by extraction with hexane. It was found that all obtained enterosorbents have good sorption properties with respect to gelatin and methylene blue. The highest sorption activity for methylene blue was shown by a sample, obtained by extraction of abies bark with hexane (97.0 mg/g), and for gelatin sorption activity – a sample, obtained by treatment of abies bark with alkali (225.0 mg/g). It was found that the enterosorbent, obtained by treatment of abies bark with alkali solution both at a dose of 0.15 g per kg of animal weight (g/kg) and at a dose of 0.20 g/kg and the enterosorbent, obtained by extraction of abies bark with hexane at a dose of 0.20 g/kg, have the highest efficiency for the treatment and prevention of acute experimental Escherichiosis. From the considered methods of obtaining enterosorbents from abies bark for the treatment and prevention of gastrointestinal infections of animals, it is recomended to use a method based on treatment of abies bark with alkalai solution and apply the drug in a dose of 0.15 g/kg
研究了用1.5%的NaOH水溶液处理破碎的冷杉树皮或用己烷萃取制备吸附剂的方法。结果表明,所制得的肠道吸附剂对明胶和亚甲基蓝均具有良好的吸附性能。用正己烷提取冷杉树皮(97.0 mg/g)得到的样品对亚甲基蓝的吸附活性最高,用碱处理冷杉树皮(225.0 mg/g)得到的样品对明胶的吸附活性最高。结果表明,以每kg动物体重(g/kg) 0.15 g和0.20 g/kg的碱溶液处理杉木树皮得到的肠道吸附剂和以0.20 g/kg的己烷提取杉木树皮得到的肠道吸附剂对急性实验性埃希菌病的治疗和预防效果最好。从所考虑的从冷杉树皮中获取肠吸收剂治疗和预防动物胃肠道感染的方法来看,建议采用碱溶液处理冷杉树皮的方法,给药剂量为0.15 g/kg
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引用次数: 1
Isolation and Study of Abies Bark Proanthocyanidins 冷杉树皮原花青素的分离与研究
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2019-12-01 DOI: 10.17516/1998-2836-0155
V. Levdansky, A. Kondrasenko, A. Levdansky, M. Lutoshkin
The process of proanthocyanidins isolation from abies bark by water and water-alcohol solutions containing 5, 10, 15 and 20 % ethanol was studied for the first time. The optimal conditions providing the maximum yield of proanthocyanidins were determined experimentally. It was shown that the use of 15-20 % water-alcohol solutions allows to increase the yield of proanthocyanidins from 0.33 to 0.38 %. The composition of the obtained proanthocyanidins was studied by UV, IR, and 13C NMR spectroscopy. The obtained proanthocyanidins were transformed into colored anthocyanidins in ethanol medium in the presence of hydrochloric acid. The flavonoids cyanidin and delphinidin were isolated and identified. It was established that the obtained proanthocyanidins mainly consist of procyanidin and prodelphinidin. It was shown that proanthocyanidins obtained from abies bark, in contrast to the proanthocyanidins isolated from pine bark described in the literature, contain gallic acid residues, which is typical for proanthocyanidins isolated from various types of tea
首次对冷杉树皮中原花青素的分离工艺进行了研究,分别采用含5%、10%、15%和20%乙醇的水-乙醇溶液进行分离。实验确定了原花青素产率最高的最佳工艺条件。结果表明,使用15- 20%的水醇溶液可将原花青素的得率从0.33%提高到0.38%。用紫外光谱、红外光谱和核磁共振13C谱对所得原花青素的组成进行了研究。将得到的原花青素在盐酸存在的乙醇培养基中转化为有色花青素。分离鉴定了黄酮类化合物花青素和飞燕草苷。结果表明,所得原花青素主要由原花青素和原飞燕素组成。结果表明,从冷杉树皮中提取的原花青素与文献中从松树树皮中分离的原花青素相比,含有没食子酸残基,这是从各种类型的茶中分离的原花青素的典型残基
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引用次数: 2
Effect of Conditions of Carbon Sorbents Producing from Abies Bark on Their Structure and Sorption Properties 冷杉树皮炭吸附剂制备条件对其结构和吸附性能的影响
IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2019-11-26 DOI: 10.17516/1998-2836-0139
Иосиф Иванов, Е.В. Веприкова, Н.В. Чесноков, I. Ivanov, E. V. Veprikova, N. V. Chesnokov
The ability of producing of effective carbon sorbents from abies bark with the use of thermal alkaline activation in presence of potassium hydroxide was shown. The effects of ratio of bark to alkaline, and temperature of bark pre-carbonization on the porous structure and sorption properties of the carbon sorbents were studied. It was shown, that the capacity of carbon sorbents on iodine is defined by pores with a width 0,73–1,86 nm, on methylene blue – 0,86–2,95 nm, and on vitamin B12 – ≥ 9,31 nm. It was determined, that the carbon sorbent, producing by alkaline activation of product of abies bark carbonization at 400 °С, has a high sorption capacity for studied marker substances. For this sorbent kinetic of iodine, methylene blue and vitamin B12 sorption was studied in comparison with the simple of commercial active coal for medical purposes. It was determined, that this sorbent exceeds the commercial sample in sorption of iodine and vitamin B12 in 1,5 time, and at sorption of methylene blue – in 1.7 time, and it is characterized by a higher rate constants of their markers sorption
以冷杉树皮为原料,在氢氧化钾存在下,采用热碱性活化法制备有效的碳吸附剂。研究了树皮碱比、树皮预碳化温度对炭吸附剂多孔结构和吸附性能的影响。结果表明,碳吸附剂对碘的吸附能力由孔径为0.73 ~ 0.86 nm、亚甲基蓝孔径为0.86 ~ 2.95 nm和维生素B12孔径≥9.31 nm决定。结果表明,在400°С下对冷杉树皮炭化产物进行碱性活化制备的碳吸附剂对所研究的标记物质具有较高的吸附能力。研究了该吸附剂对碘、亚甲基蓝和维生素B12的吸附动力学,并与单纯的商业药用活性煤进行了比较。结果表明,该吸附剂对碘和维生素B12的吸附时间为1.5倍,对亚甲基蓝的吸附时间为1.7倍,且其标记物的吸附速率常数较高
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引用次数: 1
期刊
Journal of Siberian Federal University. Chemistry
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