1. Adsorption mechanism of yttrium ions onto ion-adsorption type rare earths ore.
- Author
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Guan, Xindi, Li, Ping, Liu, Wenke, Chang, Qingqing, Han, Yunwu, Zhang, Jikai, Zhang, Hailin, Li, Qian, and Zheng, Shili
- Subjects
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YTTRIUM , *CHEMICAL processes , *ADSORPTION (Chemistry) , *ADSORPTION capacity , *IONS , *RARE earth metals - Abstract
[Display omitted] • Ion-adsorption type rare earths desorption residues as adsorbents. • The maximum Y(III) adsorption capacity of 4.45 mg·g−1. • Y(III) adsorbed onto the adsorbents surface possibly via Sii-Oi-Y bond. • Adsorption process governed by chemical adsorption. Ion-adsorption type rare earths ore, as the primary source for middle-heavy rare earth elements, was extracted by various electrolytes via the adsorption–desorption effect. In this work, adsorption behavior and mechanism for yttrium ions onto ion-adsorption type rare earths ore as adsorbents were investigated systematically and comprehensively. The isotherms and kinetics suggested the adsorption of yttrium ions was consistent to Langmuir and pseudo-second-order model, revealing that the adsorption process was homogeneous and primarily governed by chemical adsorption. Maximum adsorption capacity could attain as 4.45 mg·g−1 in pH of 3 with 10 g·L−1 yttrium ions. Moreover, thermodynamics analysis indicated the adsorption process was spontaneous, and random. ATR-FTIR, XPS and DFT results indicated that Y(III) adsorbed onto ion-adsorption type rare earths ore surface possibly via Si-O-Y bond. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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