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The mechanism of manganese dissolution on Li1.6Mn1.6O4 ion sieves with HCl
Gao, Aolei1,2; Sun, Zhenhua1; Li, Shaopeng1; Hou, Xinjuan1,2; Li, Huiquan1,2; Wu, Qisheng3; Xi, Xinguo3

Li1.6Mn1.6O4 is a representative ion sieve material that is used to recover lithium from salt brines and bitterns owing to its high lithium ion adsorption capacity reaching 11.9-44 mg g(-1). However, manganese dissolution during acid treatment hinders the industrial application of the material. For investigating the mechanism of manganese dissolution, the precursor Li1.6Mn1.6O4 and ion sieve H1.6Mn1.6O4 were prepared and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), chemical content analyses, diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS), and X-ray photoelectron spectroscopy (XPS). The results of XRD, SEM, and FT-IR showed that the bulk phase of Li1.6Mn1.6O4 retained the spinel structure, whereas the lattice diminished during acid treatment. The results of chemical content analyses showed that the bulk phase of Li1.6Mn1.6O4 contained a few trivalent manganese atoms and that the mean valence of manganese in the material increased during acid treatment. DRIFTS and XPS exhibited that the surface of Li1.6Mn1.6O4 was mostly full of tetravalent manganese and retained the spinel structure during acid treatment. In the proposed mechanism of manganese dissolution, an electron of trivalent manganese in the bulk phase transfers to the surface and is captured by tetravalent manganese within the acidic environment. Then, tetravalent manganese is converted to bivalent manganese after acquiring sufficient electrons, and dissolution occurs simultaneously.

WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordLithium Extraction ; Limn2o4 Spinel ; Adsorbent Foam ; Exchange ; Oxide ; Adsorption ; Li++ ; Recovery ; Seawater ; Dioxide
WOS Research AreaChemistry
WOS SubjectChemistry, Inorganic & Nuclear
Funding OrganizationChinese Academy of Sciences key deployment projects(ZDRW-ZS-2018-1) ; Shanxi Province Coal Based Low-carbon Technology Major Projects(MC2016-05) ; Jiangsu Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments/Yancheng Institute of Technology/Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province(YCXT201612)
WOS IDWOS:000428089100029
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, CAS Key Lab Green Proc & Engn, Beijing 100090, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Yancheng Inst Technol, Yancheng 224051, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Gao, Aolei,Sun, Zhenhua,Li, Shaopeng,et al. The mechanism of manganese dissolution on Li1.6Mn1.6O4 ion sieves with HCl[J]. DALTON TRANSACTIONS,2018,47(11):3864-3871.
APA Gao, Aolei.,Sun, Zhenhua.,Li, Shaopeng.,Hou, Xinjuan.,Li, Huiquan.,...&Xi, Xinguo.(2018).The mechanism of manganese dissolution on Li1.6Mn1.6O4 ion sieves with HCl.DALTON TRANSACTIONS,47(11),3864-3871.
MLA Gao, Aolei,et al."The mechanism of manganese dissolution on Li1.6Mn1.6O4 ion sieves with HCl".DALTON TRANSACTIONS 47.11(2018):3864-3871.
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