Властивості Zn-Мо-оксидної системи, синтезованої шляхом механохімічної обробки

O. V. Sachuk; V. O. Zazhygalov; L. S. Kuznetsova; M. M. Tsyba

doi:10.15407/hftp07.03.309

Authors

O. V. Sachuk Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine
V. O. Zazhygalov Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine
L. S. Kuznetsova Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine
M. M. Tsyba Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine

DOI:

https://doi.org/10.15407/hftp07.03.309

Keywords:

mechanochemical treatment, zinc-molybdenum composition, zinc molybdate

Abstract

The mechanochemical treatment of ZnO-MoO₃ mixtures with different molar ration of the oxides (15/85, 25/75, 50/50 and 75/25) has been studied. The treatment was realized at 550 rpm, BPR = 10 (sample mass was equal to 10 g) and variation of treatment time (2, 4 and 8 h). The properties of the obtained samples were investigated by means of XRD, IR, DTA, BET, SEM methods. It was shown that for all the compositions after 2 h of treatment the decrease of XRD reflexes intensity of initial oxides and their broadening were observed. This fact can be connected with a decrease of oxides particles size which was confirmed by calculation and SEM data. An increase of treatment time for the mixtures with ZnO/MoO₃ = 15/85 and 75/25 was accompanied by subsequent decrease of reflexes intensity and the most intense reflexes of MoO₃ and ZnO, respectively, were fixed in these compositions only. In the case of the ZnO/MoO₃ = 25/75 and 50/50 mixtures the increase of treatment time up to 4 h leads to an appearance of new reflexes which can characterized the formation of MoO₃·0.5H₂O and ZnMoO₄ phases. The IR-spectra confirm the change of phase composition of these mixtures and SEM data show the changes of the crystallites habitus. After 8 h treatment, the future changes in the composition of these mixtures were observed. Treatment of ZnO/MoO₃ = 25/75 was accompanied by little increase of both phases reflexes intensity but in the case of ZnO/MoO₃ = 50/50 the reflexes of ZnMoO₄phase were fixed only. The DTA data confirm the changes of these mixtures composition provoked by mechanochemical treatment. BET data show that treatment of ZnO/MoO₃ = 50/50 leads to the increase in specific surface area of the sample from 2 up to 9 m²/g and to the appearance of micro- and mesopores in solid (initial mixture was a non-porous composition). So, the chemical reaction between ZnO and MoO₃ initiated by mechanochemical treatment with formation of new ZnMoO₄ phase with bi-porous structure was found.

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