Obtaning of nanodispersed ferriferous pigments using contact nonequilibrium plasma
DOI:
https://doi.org/10.15587/1729-4061.2014.27705Keywords:
pigments, magnetite, goethite, obtaining, contact nonequilibrium low-temperature plasmaAbstract
The paper shows the efficiency of using a contact nonequilibrium low-temperature plasma for producing nanodispersed pigments of different colours. The influence of the initial pH, treatment time and electrical parameters of the plasma-chemical synthesis on the main technological properties of the pigments was determined. Colour characteristics of the obtained products were studied. Their phase composition was analyzed. According to the data on the dependence of the phase composition of the products formed by the oxidation of iron hydroxide (II) on the synthesis parameters, the system diagram was created to display predominant areas of each phase formation in the pH plasma treatment time coordinates.
The main trends in changing the phase composition of the solid phase from the synthesis conditions were determined during the studies.
It was found that the final product of iron hydroxide (II) oxidizing depending on the synthesis parameters can be oxyhydroxide of iron (III -a) − modification, magnetite or iron hydroxide (II).
A phase composition of the obtained product depends largely on the solution’s pH. With increasing the pH from 6 to 10 under the same synthesis parameters, such sequence of phase formation is indicated: Fe(OH)2 − a − FeOOH − Fe3O4. With the further increase of the solution’s pH, Fe3O4 is formed.References
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Copyright (c) 2014 Александр Андреевич Пивоваров, Лилия Анатольевна Фролова, Елена Григорьевна Цьопич, Маргарита Ивановна Воробьева
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