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Formation and Stability of Molybdenum and Tungsten Species in Peroxy Solution
Understanding the chemical behavior of molybdenum (Mo) and tungsten (W) species in the W–Mo–H 2 O 2 system is of great significance for their hydrometallurgy and chemical separation. In this work, the formation of molybdenum and tungsten species and their stabilities in Na + –H + –MoO 4 2− –WO 4 2−...
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| Published in: | Journal of solution chemistry 2023-05, Vol.52 (5), p.551-569 |
|---|---|
| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites |
| Online Access: | Get full text |
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| Summary: | Understanding the chemical behavior of molybdenum (Mo) and tungsten (W) species in the W–Mo–H
2
O
2
system is of great significance for their hydrometallurgy and chemical separation. In this work, the formation of molybdenum and tungsten species and their stabilities in Na
+
–H
+
–MoO
4
2−
–WO
4
2−
–H
2
O
2
solutions at different pH and H
2
O
2
concentrations were investigated by in situ Raman spectroscopy. In peroxy complex solutions, decreasing pH and increasing H
2
O
2
concentration can both promote the peroxy complexation of tungsten and molybdenum and improve the stability of their peroxy complexes. In acidic solution, isopolymolybdate complexes with H
2
O
2
and transforms into [HMo
4
O
9
(O
2
)
4
]
−
, [Mo
7
O
23
(O
2
)]
6−
, [Mo
7
O
22
(O
2
)
2
]
6−
, [HMoO
2
(O
2
)
2
]
−
, and [Mo
2
O
3
(O
2
)
4
]
2−
, their Raman bands are about 923, 935, 945, 960, and 972 cm
−1
, respectively. The isopolytungstate was converted to [WO
2
(O
2
)
2
]
2−
, [W
2
O
3
(O
2
)
4
]
2−
, and [W
7
O
22
(O
2
)
2
]
6−
with Raman bands around 950, 962, and 975 cm
−1
, respectively. When controlling 1.8 |
|---|---|
| ISSN: | 0095-9782 1572-8927 |
| DOI: | 10.1007/s10953-023-01249-4 |