Improved adsorption performance and magnetic recovery capability of Al–Fe co-doped lithium ion sieves. (29th September 2022)

• Record Type: Journal Article
• Authors: Han, Hongjing; He, Yujia; Zhang, Wangzhi; Gu, Weiwei; Wu, Yongmin; Tang, Weiping
• Is Part Of: New journal of chemistry. Volume 46:Number 40(2022)
• Page Start: 19230
• Page End: 19240
• Publication Date: 2022-09-29
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj03217a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Al–Fe co-doped H1.6 (Al0.3 Mn0.7 )1.6 Fe0.1 O4 lithium-ion sieves exhibit magnetic recovery properties and excellent recycling performance. Abstract : In this work, magnetically recyclable lithium manganese oxide ion sieves (H1.6 (Al x Mn1− x )1.6 Fe y O4, HMO- x – y ) with enhanced Li + adsorption capability were synthesized by Al–Fe co-doping via hydrothermal reactions. XRD characterization showed that the Al–Fe co-doped sample maintained the spinel crystal structure of the undoped HMO-0–0. SEM imaging and EDS mapping indicated that a rough surface with a granular convex morphology was obtained and the doping elements Al and Fe were uniformly dispersed in the grains. Magnetic studies revealed that HMO-0.3–0.1 exhibited a magnetization value of 2.86 emu g −1 and could be separated from solutions effectively using a magnet. Li + adsorption analysis showed that the equilibrium adsorption capacity of Al–Fe co-doped HMO-0.3–0.1 reached 45.31 mg g −1, which was larger than that of HMO-0.3–0 (33.39 mg g −1 ) with only Al-doping. In addition, HMO-0.3–0.1 exhibited excellent cycling performance and the Li + adsorption capacity was maintained over 95% after five cycles. Compared with the Al-doped or Fe-doped sieves, the Al–Fe co-doped lithium ion sieve with excellent adsorption performance and characteristics that can be separated from solutions by a magnetic field is generally regarded as the most promising adsorbent for recovering lithium from salt-lake brines.