Raman Studies on Species in Single and Mixed Solutions of Molybdate and Vanadate

作     者：张家靓 胡军涛 张立峰 张家靓;胡军涛;张立峰

作者机构：北京科技大学冶金与生态工程学院北京100083 北京市稀贵金属绿色回收与提取重点实验室北京100083 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2016年第29卷第4期

页      面：425-429,I0001页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：国家自然科学基金 the Fundamental Research Funds for the Central Universities 

主　　题：Raman spectroscopy Molybvanadates Molybdenum Vanadium Existing form 

摘      要：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）n^n- while Mo is MoO4^2- 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 MosO26^4- and Mo36O112^8- which are the predominant Mo species in single solution at pH=2.0-1.0.