膨润土改性偏钛酸型钛锂离子筛及吸附性能研究

doi:10.11896/cldb.22030244

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Abstract The precursor of metatitanic acid lithium ion sieve was prepared by inorganic precipitation gel solution method with titanium sulfate as titanium source, lithium acetate as lithium source and bentonite as modifier. After elution with hydrochloric acid, the metatitanic acid lithium ion sieve modified by bentonite was obtained, and its adsorption performance was studied. The surface morphology, crystal phase composition, specific surface area and pore structure, element content and valence of the samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and surface area analyzer (BET) and X-ray photoelectron spectrometer (XPS), respectively. The results show that, after bentonite modification, a mesoporous structure is observed in the sample, the elution rate of achieves 99.85% by pickling the sample with 0.2 mol/L hydrochloric acid at 50 ℃ for 6 h. The adsorption capacity of lithium ion sieve modified by bentonite reaches 45.49 mg/g in LiOH solution with a Li⁺concentration of 2 g/L at 25 ℃ for 24 h, which is significantly higher than that of the unmodified sample (30.62 mg/g). A Si-O tetrahedral layer is existed in the modified Li₂TiO₃, and part of Li enters the Si-O tetrahedral gap, resulting in the increase of the surface area and adsorption capacity of the modified sample. The adsorption kinetic process conforms to the pseudo second-order kinetic model, and the adsorption mode is chemical monolayer adsorption.

Key words： inorganic precipitation-peptization method titanium lithium ion sieve bentonite pickling adsorption

Published: 10 October 2023 Online: 2023-09-28

CLC number:

TB34

Fund:Sichuan Science and Technology Program (2023YFG0247) and Undergraduate Innovative Project of Neijiang Normal University (X2022001).

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	ZHANG Liyuan
	LI Yan
	SHUI Yi
	ZHANG Jingjing
	WU Na
	YANG Jinju

Cite this article:

ZHANG Liyuan,LI Yan,SHUI Yi, et al. Bentonite Modified Metatitanate Titanium-Lithium Ion Sieve and Its Adsorption Performance[J]. Materials Reports, 2023, 37(19): 22030244-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22030244 OR http://www.mater-rep.com/EN/Y2023/V37/I19/22030244

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