Removing Trace Chromium from High Concentration Vanadium Solution by Photoreduction Deposition with Ti–Zr Solid Solution
Removing Trace Chromium from High Concentration Vanadium Solution by Photoreduction Deposition with Ti–Zr Solid Solution
复制标题
DOI：
10.1016/j.seppur.2022.120855
复制
发表时间：
2022-03
影响因子：
8.6
通讯作者：
Kunpeng He;Pingting Chen;Biao Yuan;Fujin Sun;Jian He;Pan Wu;Changjun Liu;Wei Jiang
中科院分区：
文献类型：
--
作者：
Kunpeng He;Pingting Chen;Biao Yuan;Fujin Sun;Jian He;Pan Wu;Changjun Liu;Wei Jiang
制备超高纯度钒（> 99.99wt%）需要去除痕量的铬，但是由于V（V）和Cr（IV）离子的相似性质，使用粗钒母液（> 98wt%）难以实现经济的钒纯化。采用Ti-Zr固溶体光催化还原法深度净化高浓度多钒酸铵溶液中的微量铬。结果表明，V（V）和Cr（VI）是竞争吸附和光还原的，但V（V）优先吸附，且吸附速度比Cr（VI）快。然而，在V（V）的光还原产物之后，V（IV）被解吸，而在Cr（VI）的光还原产物之后，Cr（III）沉积在光催化剂上，实现钒和铬的分离。2 h除铬率超过80%，所得钒中铬含量小于0.04wt%。沉淀后得到的偏钒酸铵中铬含量小于0.001wt%，最终V2 O 5产品纯度大于99.99%，满足超高纯钒产品的要求。使用后的光催化剂可再生重复使用，性能稳定。本研究为高纯钒的生产提供了参考方法，也为光还原法的工业应用提供了实例。
The preparation of ultrahigh-purity vanadium (>99.99 wt%) requires the removal of trace amounts of chromium, but economical vanadium purification is difficult to achieve using crude vanadium mother liquors (>98 wt%) because of the similar properties of V(V) and Cr(IV) ions. In this study, a Ti–Zr solid solution was used for the deep purification of high-concentration ammonium polyvanadate by removing trace chromium using photocatalytic reduction process. The results show that V(V) and Cr(VI) are competitively adsorbed and photoreduced, but V(V) adsorption is preferred and occurs more rapidly than that of Cr(VI). However, after the photoreduction product of V(V), V(IV) is desorbed, whereas after that of Cr(VI), Cr(III) is deposited on the photocatalyst, achieving the separation of vanadium and chromium. The 2 h removal efficiency of chromium exceeds 80%, and the chromium content in the obtained vanadium is less than 0.04 wt%. After precipitation, the chromium content in the obtained ammonium metavanadate is less than 0.001 wt%, and the purity of the final V2O5product exceeds 99.99%, which meets the requirement for ultrahigh-purity vanadium products. The used photocatalyst can be regenerated and reused with stable performance. This work provides a reference method for ultrahigh-purity vanadium production and an example of the industrial application of the photoreduction process.