Effect of Ti-containing precursors on structure and adsorption performance of Li4Ti5O12 and Li2TiO3 oxides to Li+ ions
Ivanets A. Bicheva E. Prozorovich V. Kouznetsova T. Aimbetova I.O. Su X.
5 May 2024Elsevier B.V.
Separation and Purification Technology
2024#335
Using solid-phase synthesis method, Li4Ti5O12 and Li2TiO3 oxides were synthesized and used as adsorbents for Li+ ions. The physical–chemical properties were studied, using X-ray diffraction analysis, IR-spectroscopy, low-temperature adsorption–desorption of nitrogen, and scanning electron microscopy. It was shown that, using anatase as a Ti-containing precursor, single-phase oxides Li4Ti5O12 (d 26.5 nm, a 8.401 Å, V 569.5 Å3) and Li2TiO3 (d 26.5 nm, a 7.731 Å, V 462.1 Å3) with macro-mesoporous structure (ABET 11 and 16 m2/g, VBJH des 0.03 and 0.03 cm3/g, DBJH des 6 and 6 nm, respectively) and spherical-like morphology were obtained. For the samples obtained from rutile, an impurity of unreacted Ti-containing precursor was detected. The effect of the nature of Ti-containing precursors, concentration and temperature of HCl regeneration solution, and contact time on the degree of conversion to H-form and adsorption capacity of the obtained adsorbents was studied. The highest efficiency of ion exchange of Li+ ions with H+ (γH+ 96.7–100 %) was reached in conversion of adsorbents to H-form, during treatment with 0.1 M HCl at temperature of 70 °C for 48 h. Adsorbents H4Ti5O12 and H2TiO3 prepared from anatase showed higher adsorption efficiency of Li+ ions (qe 95.1 and 84.0 mg/g, α 34.7 and 32.9 %, respectively) compared to samples obtained from rutile (qe 75.7 and 81.2 mg/g, α 23.8 and 29.9 %, respectively). After three cycles of acid regeneration, the adsorption capacity was maintained at 40.6–47.0 mg/g for Li4Ti5O12, and at 34.8–38.4 mg/g for Li2TiO3, respectively. The hydrogen demonstration during adsorption–desorption cycles increased from 8.4 to 10.8 for Li4Ti5O12, and from 8.0 to 11.2 for Li2TiO3. Anatase Ti-containing precursor recrystallization into rutile modification and further amorphization was determined. The presented results are interesting for developing highly efficient adsorbents for Li+ ions recovery from aqueous solutions.
Adsorbent regeneration , Li2TiO3 , Li4Ti5O12 , Li+ ion adsorption , Li+ ions sieves
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Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus, Minsk, Belarus
Khoja Akhmet Yassawi International Kazakh-Turkish University, B.Sattarkhanov str., Turkestan, 161200, Kazakhstan
School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangdong, Guangzhou, 510006, China
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Khoja Akhmet Yassawi International Kazakh-Turkish University
School of Environment and Energy
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