title: Lithium recovery with LiTi2O4ion-sieves.
abstract: A feasibility study for the recovery of lithium from salt water with the protonated lithium titanium oxide ion-sieves was carried out in this work. Lithium ions (Li+) in LiTi2O4having a similar ion density with H+allow repeated exchanges and regeneration with high selectivity. By Li7magic angle spinning solid-state magnetic resonance, it is apparent that chemical structure of lithium in the ion-sieves is not perturbed during the repeated Li+/H+exchange processes. As the dissolution of titanium is negligible (<0.1%), the secondary contamination during the capture process can be minimized. The ion-sieves exhibit lithium capture capacities of up to 9.5mg/g during the repeated Li+/H+exchanges with H0.23Li0.77Ti2O4/LiTi2O4for 24h, and the captured Li+may be recovered in the form of Li2CO3. Accordingly, the lithium capture method developed in this work could be integrated with current desalination processes for valuable lithium recovery.
authors.affiliation: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
authors.forename: C-W
authors.initials: CW
authors.lastname: Chen
authors.affiliation: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
authors.forename: P-A
authors.initials: PA
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, The Pennsylvania State University, State College, PA 16801, USA.
authors.forename: C-J
authors.initials: CJ
authors.lastname: Wei
authors.affiliation: Department of Safety, Health and Environmental Engineering, National United University, Miaoli 36000, Taiwan.
authors.forename: H-L
authors.initials: HL
authors.lastname: Huang
authors.affiliation: Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 81184, Taiwan.
authors.forename: C-J
authors.initials: CJ
authors.lastname: Jou
authors.affiliation: Department of Environmental Science and Engineering, Tunghai University, Taichung 40704, Taiwan.
authors.forename: Y-L
authors.initials: YL
authors.lastname: Wei
authors.affiliation: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan. Electronic address: wanghp@mail.ncku.edu.tw.
authors.forename: H Paul
authors.initials: HP
authors.lastname: Wang
mesh_terms: D052918:Environmental Restoration and Remediation / Q000379:methods*; D005240:Feasibility Studies; D007477:Ions; D008094:Lithium / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D012623:Seawater; D014025:Titanium / Q000737:chemistry
chemical_list: D007477:Ions; C009495:titanium dioxide; D008094:Lithium; D014025:Titanium
keywords: Ion-sieves; Lithium titanium oxide; Recovery of lithium; Seawater