title: Novel geochemistry-inspired method for the deep removal of vanadium from molybdate solution.
abstract: Separation of vanadium from molybdates is an essential task for processing the leaching solution of hazardous spent hydrodesulphurization (HDS) catalyst. In this study, the difference in the main naturally occurring mineral forms of Mo and V inspired us to develop a method for the deep removal of V from molybdate solution using Fe3O4as an adsorbent. First, the adsorbent was synthesized with coprecipitation method, and then it was characterized by XRD, TEM, and VSM. The synthesized material consisted of pure Fe3O4nanoparticles that exhibited paramagnetic property, with a saturated magnetization of 68.6emug-1. The V removal efficiency was investigated using batch adsorption experiments in varying conditions. Results indicated that V could be deeply removed from various concentrations of molybdate solution at pH of 7.0-11.0 within 5min. A slight decrease was found in the adsorption ratio after the adsorbent had been reused for 4 cycles. The resulting molybdate solution contained less than 0.02gL-1of V, which satisfies the requirement for preparing high-quality products. Finally, a process flowchart is presented for the separation of Mo and V from the leaching solution of spent HDS catalyst, based on the excellent V removal performance and rapid separation rate of the Fe3O4adsorbent.
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Green Recycling and Extraction of Metals, Beijing, 100083, China.
authors.forename: Jialiang
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
authors.forename: Yuping
authors.initials: Y
authors.lastname: Deng
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
authors.forename: Qiuyue
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
authors.forename: Peixin
authors.initials: P
authors.lastname: Qin
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
authors.forename: Yubo
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China. Electronic address: chywang@yeah.net.
authors.forename: Chengyan
authors.initials: C
authors.lastname: Wang
keywords: Fe(3)O(4) nanoparticles; Geochemistry; Molybdate solution; Spent HDS catalysts; Vanadium adsorption