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. 2023 Jun;30(27):70731-70741.
doi: 10.1007/s11356-023-27415-1. Epub 2023 May 8.

Enhanced selective separation of vanadium(V) and chromium(VI) using the CeO2 nanorod containing oxygen vacancies

Ruixi Lin  1   2 , Jiarong Li  1   2 , Xuequan Jing  1   2 , Meina Guo  1 , Guoqing Ren  3 , Haonan Qin  1   2 , Zhangwei Yao  1 , Yinhua Wan  1   2   4   5 , Weijie Song  1   2   4   5 , Huifeng Zeng  1 , Feifei Yang  1 , Da Zhao  1 , Kang Hu  6   7   8
Affiliations

Enhanced selective separation of vanadium(V) and chromium(VI) using the CeO2 nanorod containing oxygen vacancies

Ruixi Lin et al. Environ Sci Pollut Res Int. 2023 Jun.

Abstract

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 (V5+) and chromium (Cr6+) because of their similar properties. Herein, a kind of CeO2 nanorod containing oxygen vacancies is facilely synthesized which displays ultra-high selectivity of V5+ 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 (SFV/Cr) of 114,169.14 for the selectivity of V5+ is achieved at the Cr6+/V5+ ratio of 80 with the trace amount of V5+ (~ 1 mg/L). The results show that the process of V5+ uptake is the monolayer homogeneous adsorption and is controlled by external and intraparticle diffusions. In addition, it also shows that V5+ is reduced to V3+ and V4+ and then formation of V-O complexation. This work offers a novel CeO2 nanorod material for efficient separation of V5+ and Cr6+ and also clarifies the mechanism of the V5+ adsorption on the CeO2 surface.

Keywords: CeO2 nanorod; Oxygen vacancies; Selective removal; Vanadium ions.

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