氟化对钛锂离子筛制备及性能的影响

doi:10.11896/cldb.22090255

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Abstract Fluoride modified lithium titanate (F-Li₂TiO₃) was prepared by hydrothermal method with titanium dioxide as titanium source, lithium hydroxide as lithium source and ammonium fluoride as modifier, followed by picking with hydrochloric acid to obtain fluoride modified titanium fluoride lithium ion sieve (F-H₂TiO₃). The effects of ammonium fluoride content and calcination temperature on the surface morphology and crystal structure of Li₂TiO₃ precursor were studied. The elution performance of F-Li₂TiO₃ and the adsorption performance of F-H₂TiO₃ were investigated. The surface morphology, crystal phase, specific surface area and pore structure, element content and valence state of the samples were characte-rized using scanning electron microscopy (SEM), X-ray diffraction (XRD), specific surface area analyzer (BET), and X-ray photoelectron spectroscopy (XPS), respectively. The results showed that F-Li₂TiO₃ with relatively dispersed particles and porous accumulation could be obtained when the fluorine titanium ratio was 0.15. The crystallinity of each crystal surface was the most complete with a calcination at 700 ℃, and the elution rate reached 96.98%, which was significantly higher than that of unmodified samples (90.55%). The maximum adsorption capacity of F-H₂TiO₃ reached 46.52 mg/g, which was greatly improved compared with 35.51 mg/g of the unmodified sample. The Li⁺ adsorption speed was significantly accelerated, and the adsorption equilibrium time was shortened from 12 h to 10 h. The adsorption isotherm conforms to the Langmuir model, the adsorption kinetics follows to pseudo second-order kinetic model, and the adsorption way is chemical monolayer adsorption.

Key words： titanium-lithium ion sieve fluorination hydrothermal process elution rate adsorption capacity

Published: Online: 2024-10-12

CLC number:

O647.3

Fund:This work was financially supported by Sichuan Science and Technology Program (2023YFG0247) and Undergraduate Innovative Project of Neijiang Normal University (X2022001).

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	ZHANG Liyuan
	ZHANG Jingjing
	WU Na
	SHEN Ruqian

Cite this article:

ZHANG Liyuan,ZHANG Jingjing,WU Na, et al. Effect of Fluorination on Preparation and Properties of Titanium Lithium Ion Sieve[J]. Materials Reports, 2024, 38(18): 22090255-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22090255 OR http://www.mater-rep.com/EN/Y2024/V38/I18/22090255

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