Novel LIS-Doped Mixed Matrix Membrane Absorbent With High Structural Stability for Sustainable Lithium Recovery From Geothermal Water

• DOI: 10.2139/ssrn.3983670
• Publication Date: 2022-02-23T07:56:09Z
• Authors: Ju Miao; Kaiyu Zhao; Feng Guo; Lina Xu; Yingchun Xie; Tianlong Deng
• Keywords: Matrix (chemical analysis)

Lithium-ion sieves (LIS) have gained significant interest in lithium recovery from geothermal water. However, the severe loss and low recyclability of powder adsorbents restrict their practical application. Here, symmetric mixed matrix membranes LIS (MMMs-LIS) were prepared after doping dopamine-modified into polysulfone (PSf) by breath figure approach with characters thickness, high exposure area H2TiO3 (HTO) structural stability. The hydrophilic dopamine (DA) would probably promote condensate water droplets to penetrate PSf make smaller HTO/DA preferably emerge on pore surfaces, accelerating intercalation Li+ vacancies HTO premise strengthened interfacial interaction between matrix. Therefore, well-designed MMMs processed a comparable adsorption capacity 25.01 mg·g-1 an equilibrium time 45 minutes powdery during dynamic process at 298.15K (C0=25.78 mg·L-1, pH=12.0). Moreover, Ti4+ rate decreased 10.5% down 1.1% first desorption then gradually alleviated multiple cycles until stabilized 2.3%, indicating excellent These results suggest great potentials for sustainable