Direct hydrothermal synthesis of ternary Li-Mn-O oxide ion-sieves.
Spinel-type ternary LiMn(2)O(4) oxide precursor was synthesized by direct hydrothermal synthesis of Mn(NO(3))(2), LiOH, and H(2)O(2) at 383 K for 8 h, a better technique for controlling the nanocrystalline structure with well-defined pore size distribution and high surface area than the traditional solid state reaction method. The final low-dimensional MnO(2) nanorod ion-sieve with a lithium ion selective adsorption property was further prepared by an acid treatment process to completely extract lithium ions from the Li-Mn-O lattice. The effects of hydrothermal reaction conditions on the nanostructure, chemical stability, and ion-exchange property of the LiMn(2)O(4) precursor and MnO(2) ion-sieve were systematically examined via powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), and lithium ion selective adsorption measurements. The results show that this new kind of low-dimensional MnO(2) nanorod can be used for lithium extraction from aqueous environments, including brine, seawater, and waste water.
State Key Lab of Chemical Engineering, College of Chemical Engineering, East China University of Science and Technology, Shanghai, P. R. China. qhzhang@ecust.edu.cn
Qin-Hui
QH
Zhang
Shu-Ying
SY
Sun
Shao-Peng
SP
Li
Xian-Sheng
XS
Yin
Jian-Guo
JG
Yu
D000327:Adsorption; D007477:Ions; D007700:Kinetics; D008094:Lithium / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure; D009584:Nitrogen / Q000737:chemistry; D010087:Oxides / Q000032:analysis* / Q000138:chemical synthesis* / Q000737:chemistry; D013696:Temperature; D014961:X-Ray Diffraction
D007477:Ions; D010087:Oxides; D008345:Manganese; D008094:Lithium; D009584:Nitrogen