Role of humic substances in the formation of nanosized particles of iron corrosion products

Particle size distribution during a corrosion reactionRole of humic substances in the formation of nanosized particles of iron corrosion products. Pankratov D.A., Anuchina M.M. //Russian Journal of Physical Chemistry A. 2017. V.91. №2. P.233-239.Search the full text below. Ищи полный текст ниже.

The corrosion of metallic iron in aqueous solutions of humic substances (HS) with limited access to air is studied. The HS are found to exhibit multiple functions. Acid–base, redox, and surfactant properties, along with the ability to form complexes with iron in solution, are displayed in the corrosion process. Partial reduction of the HS during the corrosion reaction and their adsorption onto the main corrosion product (Fe3O4 nanoparticles) are observed.

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Sorption of humic substances on a weakly basic anion-exchange resin: Relationship with the adsorbate structure

Experimental data on the sorption of HS on ANS anion-exchange resin and respective theoretical isotherms in terms of (1) the BET and (2–7) Langmuir models: (solid lines) commercial preparations (1) CHS, (3) LH, and (5) CHP and (dashed lines) desalted samples (2) CHA-SH, (4) LHA, (6) PHF, and (7) PHASorption of humic substances on a weakly basic anion-exchange resin: Relationship with the adsorbate structure. Pankratov D.A., Anuchina M.M., Borisova E.M., Volikov A.B., Konstantinov A.I., Perminova I.V. //Russian Journal of Physical Chemistry A. 2017. V.91. №6. P.1109-1115.Search the full text below. Ищи полный текст ниже.

Adsorption of a broad range of humic substances (HS) of different origins and fractional compositions on a macroporous weakly basic anion-exchange resin is studied. It is found that the nature of the humic substances has a substantial effect on both the efficiency of sorption and the mechanism of interaction with the adsorbent. The dependence of the determined thermodynamic parameters of sorption on the humic substances origin, composition, and structure is shown for a broad range of humic substances. It is concluded that the results can be used to predict the sorption properties of weakly basic anion-exchange resins with respect to humic substances of known origin and structural group composition.

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Properties of Iron-Containing Nanohydroxyapatite- Based Composites

EPR spectra of the (a) N-a and (b) N-c samplesProperties of Iron-Containing Nanohydroxyapatite-Based Composites. Pankratov D.A., Dolzhenko V.D., Ovchenkov E.A., Anuchina M.M., Severin A.V. //Inorganic Materials. 2017. V.53. №1. P.89-98.Search the full text below. Ищи полный текст ниже.

The paramagnetic properties of compounds resulting from the synthesis of nanohydroxyapatite in the presence of Fe(III) ions have been studied by electron paramagnetic resonance, Mössbauer spectroscopy, and magnetochemistry. Based on the obtained results on the mechanism of the reaction between an orthophosphoric acid solution and an aqueous calcium hydroxide suspension, we have found conditions for incorporating Fe(III) impurity ions into hydroxyapatite. We have studied samples differing in the sequence in which reagents were mixed and in hydroxyapatite crystallite formation conditions. It has been shown that, in all instances, the composition and properties of the iron-containing phases in the composites depend significantly on both synthesis and heat treatment conditions.

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Участие гуминовых веществ в процессах коррозии металлического железа

ХХ Менделеевский съезд по общей и прикладной химииАнучина М.М., Панкратов Д.А. Участие гуминовых веществ в процессах коррозии металлического железа. /ХХ Менделеевский съезд по общей и прикладной химии. В 5 т. Т. 1 : тез. докл. – Екатеринбург: Уральское отделение Российской академии наук, 2016 г. С. 128–128
Anuchina М. М., Pankratov D. А. Involvement of humic substances in corrosion processes of metallic iron. /XX Mendeleev Congress on general and applied chemistry. Five-volumes book. Vol. 1 : abstracts. Fundamental problems of chemical science. 26–30 September EKATERINBURG • 2016. — Ural Branch of the Russian Academy of Sciences Ekaterinburg, 2016. P. 129–129

Коррозионные процессы металлоконструкций распространены повсеместно. Они наносят значительный экономический ущерб и являются причиной экологических загрязнений. Например, большую опасность представляет коррозия боеприпасов, находящихся как в водных, так и в почвенных системах. Основным органическим компонентом почв являются гуминовые вещества (ГВ), представляющие собой сложную смесь высокомолекулярных природных соединений. Благодаря наличию в составе большого количества функциональных групп, ГВ способны активно взаимодействовать с ионами металлов с образованием комплексов или стабилизировать наноразмерные оксо(гидроксо) формы металлов.

Corrosion processes of metals are widespread everywhere. These processes cause significant economic damage and lead to environmental pollution. For example, corrosion of ammunition in water and soil systems pose a considerable hazard. The main organic components of soils are humic substances (HS). They are complex mixtures of high-molecular natural compounds. HS have a great number of functional groups in their structure. They interact readily with ions of metals forming complexes or stabilize nanoparticle oxohydroxo forms of metals.

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