Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling, Chongqing, 408100, P. R. China.
Sci Rep. 2020 Apr 14;10(1):6326. doi: 10.1038/s41598-020-63359-z.
The vanadium (V) and chromium (VI) was hard to separate directly due to the similar nature. In this paper, separation and recovery of vanadium (V) and chromium (VI) from a leaching solution was investigated by adsorption of vanadium (V) with melamine, followed by electro-reduction of chromium (VI) and adsorption of chromium (III) with melamine, respectively. The effects of experimental parameters including dosage of melamine, reaction temperature and reaction time on the adsorption process were investigated. The results showed that melamine was a good sorbent for adsorption of vanadium (V) and chromium (III). 99.89% of vanadium (V) was adsorbed by melamine at the optimal conditions, the adsorption kinetic was followed the pseudo-second-order model and the adsorption isotherm conformed to the Langmuir model. While the adsorption of chromium (III) was followed the pseudo-first-order model and the adsorption isotherm was conformed to the Freundlich model as the adsorption efficiency was 98.63% under optimal conditions.
由于性质相似，钒（V）和铬（VI）很难直接分离。本文采用三聚氰胺吸附钒（V），然后分别用电还原铬（VI）和三聚氰胺吸附铬（III）的方法，从浸出液中分离和回收钒（V）和铬（VI）。考察了三聚氰胺用量、反应温度和反应时间等实验参数对吸附过程的影响。结果表明，三聚氰胺是吸附钒（V）和铬（III）的良好吸附剂。在最佳条件下，99.89%的钒（V）被三聚氰胺吸附，吸附动力学符合准二级模型，吸附等温线符合朗缪尔模型。而铬（III）的吸附则遵循准一级模型，吸附等温线符合弗伦德利希模型，在最佳条件下吸附效率为 98.63%。
