COMPUTER QUANTUM-CHEMICAL SIMULATION OF MULTICOMPONENT SIO-MEO SYSTEMS

Впервые с помощью компьютерного квантово-химического моделирования показана возможность формирования поликомпонентных систем SiO - FeO, SiO -MnO и SiO - CuO путем адсорбции на поверхности микросфер SiO металлоксидного слоя, состоящего из наночастиц диоксида марганца (IV), смешанного оксида железа или наночастиц оксида меди (II). По результатам сканирующей электронной микроскопии установлено, что формирование металлоксидного слоя в образце SiO - FeO произошло наиболее равномерно среди всех представленных образцов поликомпонентных систем. В рамках квантовохимического моделирования установлено, что наиболее энергетически выгодным и стабильным является взаимодействие SiO с наночастицами FeO . For the first time, in this work, the possibility of forming multicomponent SiO -FeO, SiO -MnO and SiO - CuO systems by adsorption of a metal oxide layer consisting of nanoparticles of manganese (IV) dioxide, mixed iron oxide or nanoparticles of copper (II) oxide on the surface of SiO microspheres has been shown by means of a computer quantum-chemical simulation. According to the results of the scanning electron microscopy, it was found that formation of a metal oxide layer in the SiO - FeO sample occurred most uniformly among all the presented samples of multicomponent systems. Within the framework of quantum-chemical simulation, it was found that the most energetically favorable and stable was the interaction of SiO with FeO nanoparticles.

KINETIC PARAMETERS OF THE ENZYMATIC REACTION OF OXIDATION OF 2,3,6-TRIMETHYLPHENOL

В работе приводится расчет кинетических параметров V и K для реакции окисления 2,3,6-триметилфенола пероксидом водорода в присутствии нативной и иммобилизованной пероксидазы корня хрена. Иммобилизация пероксидазы осуществлялась на магнитные наночастицы FeO и неорганические носители SiO, AlO. Образцы SiO и AlO были предварительно модифицированы и активированы, с помощью хитозана и глутарового альдегида, соответственно. Магнитные наночастицы предварительно обрабатывались 3-аминопропилтриэтоксисиланом для обеспечения поверхности носителя необходимыми для ковалентной иммобилизации функциональными группами -NH. Установлено, что магнитные наночастицы являются наиболее подходящим носителем для гетерогенного биокатализатора в реакции окисления 2,3,6-триметилфенола. К тому же, такой катализатор может легко отделяться от реакционной смеси и продуктов реакции с помощью внешнего магнитного поля. In the work the calculation of the kinetic parameters V and K for the oxidation of 2,3,6-trimethylphenol with hydrogen peroxide in the presence of native and immobilized horseradish root peroxidase was presented. Peroxidase was immobilized on magnetic FeO nanoparticles and inorganic carriers SiO, AlO. Samples of SiO and AlO were previously modified and activated by chitosan and glutaraldehyde, respectively. Magnetic nanoparticles were pretreated with 3-aminopropyltriethoxysilane to provide the functional groups -NH required for covalent immobilization on the support surface. It has been established that magnetic nanoparticles are the most suitable carrier for a heterogeneous biocatalyst for the oxidation reaction of 2,3,6-trimethylphenol. Besides, such a catalyst can be easily separated from the reaction mixture and reaction products using an external magnetic field.

Carbon material-supported Fe7C3@FeO nanoparticles: a highly efficient catalyst for carbon dioxide reduction with 1-butene

Highly dispersed Fe7C3@FeO supported on AC was synthesized and demonstrated as an excellent catalyst for carbon dioxide reduction with 1-butene.

Effect of Foliar Zno and Feo Nanoparticles Application on Growth and Nutritional Quality of Red Radish and Assessment of Their Accumulation on Human Health

In order to assess the effects of green synthesized nanoparticles (GNPs) of Zn and Fe oxides on plant growth traits, photosynthetic capacity and nutritional quality of red radish (cv. Champion), two open field experiments were organised based on RCBD with four replicates. Treatments included: chicken manure, foliar application of ZnO + FeO (GNPs at a rate of 60 and 50 ppm, respectively), chicken manure plus ZnO + FeO (GNPs). This study revealed that growth and yield of radish plants significantly increased by ZnO + FeO nanoparticles application. The maximum vegetative growth, leaf pigments and root quality (diameter and weight) were recorded in plants treated with ZnO + FeO (GNPs) alone or in combination with chicken manure. Furthermore, the combined application of chicken manure with ZnO and FeO significantly improved the concentration of anthocyanins, phenols, tannins, flavonoids, crude protein and carbohydrates contents in radish root than single treatment. Similar trends were noted in photosynthesis rate, water use efficiency and values of Zn and Fe contents. In addition, health risk index for Zn and Fe were less than 1, which indicated to red radish plants supplied with ZnO and FeO GNPs were free of risks on human health. It was concluded that combination between chicken manure and ZnO + FeO GNPs can be considered as appropriate strategy for improving yield and nutritional status of red radish.