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.
Zhang
Qin-Hui
QH
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
Sun
Shu-Ying
SY
Li
Shao-Peng
SP
Yin
Xian-Sheng
XS
Yu
Jian-Guo
JG
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