Enhanced selective separation of vanadium(V) and chromium(VI) using the CeO 2 nanorod containing oxygen vacancies

• Published in: Environmental science and pollution research international Vol. 30; no. 27; p. 70731
• Main Authors: Lin, Ruixi, Li, Jiarong, Jing, Xuequan, Guo, Meina, Ren, Guoqing, Qin, Haonan, Yao, Zhangwei, Wan, Yinhua, Song, Weijie, Zeng, Huifeng, Yang, Feifei, Zhao, Da, Hu, Kang
• Format: Journal Article
• Language: English
• Published: Germany 01.06.2023
• Subjects: Adsorption; Chromium - analysis; Ions; Vanadium; Wastewater; Water Pollutants, Chemical - analysis; Vanadium ions; Oxygen vacancies; CeO2 nanorod; Selective removal
• ISSN: 1614-7499

Adsorption of vanadium from wastewater defends the environment from toxic ions and contributes to recover the valuable metal. However, it is still challenging for the separation of vanadium (V ) and chromium (Cr ) because of their similar properties. Herein, a kind of CeO nanorod containing oxygen vacancies is facilely synthesized which displays ultra-high selectivity of V against various competitive ions (i.e., Fe, Mn, Cr, Ni, Cu, Zn, Ga, Cd, Ba, Pb, Mg, Be, and Co). Moreover, a large separation factor (SF ) of 114,169.14 for the selectivity of V is achieved at the Cr /V ratio of 80 with the trace amount of V (~ 1 mg/L). The results show that the process of V uptake is the monolayer homogeneous adsorption and is controlled by external and intraparticle diffusions. In addition, it also shows that V is reduced to V and V and then formation of V-O complexation. This work offers a novel CeO nanorod material for efficient separation of V and Cr and also clarifies the mechanism of the V adsorption on the CeO surface.