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Raman Studies on Species in Single and Mixed Solutions of Molybdate and Vanadate
Jia-liang Zhang,Jun-tao Hu,Li-feng Zhang
Author NameAffiliationE-mail
Jia-liang Zhang School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;Beijing Key Laboratory of Green Recycling and Extraction of Metals, Beijing 100083, China  
Jun-tao Hu School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China  
Li-feng Zhang School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;Beijing Key Laboratory of Green Recycling and Extraction of Metals, Beijing 100083, China zhanglifeng@ustb.edu.cn 
Abstract:
Raman spectroscopy was applied to investigate the speciation in both single and mixed solutions of molybdate and vanadate at pH values from 10.0 to 1.0. Evidence was obtained for the difference of existing forms between these two elements. Vanadium mainly exists as (VO3)nn- while Mo is MoO42- in the pH range of 9.0-7.5. This difference is the theoretical basis for many available separation process. The species in the binary system was identified by comparing the Raman spectra with that in the single systems. Molybvanadates are formed below pH=6.5, which may partly be ascribed to the replacement of V atoms by Mo atoms in some V-O-V groups. Vanadium mainly exists as the decavanadate species in the pH range of 6.0-2.0. The predominant species of Mo are heteropolyanions having structural features of heptamolybdate rather than Mo8O264- and Mo36O1128- which are the predominant Mo species in single solution at pH=2.0-1.0.
Key words:  Raman spectroscopy  Molybvanadates  Molybdenum  Vanadium  Existing form
FundProject:This work was supported by the National Natural Sci-ence Foundation of China (No.51504022) and the Fun-damental Research Funds for the Central Universities (No.FRF-TP-15-068A1).
钼、钒的单一及混合溶液中离子存在形态的拉曼光谱研究
张家靓,胡军涛,张立峰
摘要:
利用拉曼光谱研究了钼、钒单一及混合溶液在pH=10.0~1.0时的离子分布行为. 钼、钒离子在存在形式上存在着差异:当pH=9.0~7.5时钒主要以(VO3)nn-形式存在,而钼主要为MoO42-. 这一差异是目前现有的许多钼钒分离方法的基本原理. 通过将混合溶液体系的拉曼光谱与单一体系进行对比,分析得出了混合体系中离子的存在形式. 当pH低于6.5时,部分V-O-V基团中的V原子会被Mo原子取代,从而形成了钼钒杂多酸离子. 当pH=6.0~2.0时,钒主要以十聚钒酸盐形式存在;当pH=2.0~1.0时,混合溶液中的钼主要以具有七钼酸盐结构的杂多酸离子存在,而在相同pH的单一溶液中,钼的存在形式主要为Mo8O264-和Mo36O1128-.
关键词:  拉曼光谱  钼钒杂多酸      存在形态
DOI:10.1063/1674-0068/29/cjcp1604069
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