Su Y, Qian F, Qian Z. Enhancing adsorption capacity and structural stability of Li
1.6Mn
1.6O
4 adsorbents by anion/cation co-doping.
RSC Adv 2022;
12:2150-2159. [PMID:
35425223 PMCID:
PMC8979199 DOI:
10.1039/d1ra07720a]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/06/2022] [Indexed: 11/21/2022] Open
Abstract
Modifying the structure of Li1.6Mn1.6O4 (LMO) to enhance its structural stability and adsorption capacity is an effective method to generate materials to recover Li+ ions from mixed solution. Herein, the co-doping of trace non-metal ion (S) and metal ion (Al) into Li1.6Mn1.6O4 (LMO-SAl) is established and shows excellent Li+ adsorption capacity and Mn anti-dissolution properties. The adsorption capacity (when [Li+] is 6 mmol L−1) is increased from 26.1 mg g−1 to 33.7 mg g−1. This is attributed to improved charge density via substitution of S at O sites, which facilitates the adsorption/desorption process. The Mn dissolution is also reduced from 5.4% to 3.0% for LMO-SAl, which may result from the stronger Al–O bonds compared to Li–O bonds that enhance the structural stability of the LMO. The ion-sieving ability of the co-doped material goes by the order of Kd (Li+ > Ca2+ > Mg2+ > Na+ > K+), indicating that Li+ can be efficiently separated from Lagoco Salt Lake brine. These results predict that lithium ions are effectively adsorbed from brine by the co-doped LMO material, which manifests the feasibility of lithium recovery and provides basic data for further industrial applications of adsorption.
Modifying the structure of Li1.6Mn1.6O4 (LMO) to enhance its structural stability and adsorption capacity is an effective method to generate materials to recover Li+ ions from mixed solution.![]()
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