Effect of Fe3+ ions doping on adsorption efficiency of Li4Ti5O12 and Li2TiO3 oxides towards Li+ ion
Ivanets A. Bicheva E. Prozorovich V. Kouznetsova T. Hosseini-Bandegharaei A. Keikimanova M. Su X. Ruzimuradov O.
20 January 2025Elsevier B.V.
Colloids and Surfaces A: Physicochemical and Engineering Aspects
2025#705
Adsorbents based on Fe3+-doped oxides Li1.33- xFe3xTi1.67–2xO4 (x=0.1–0.9) and Li2–2xFexTi1-xO3 (x=0.05–0.35) were synthesized by solid-phase method. It was found that the Li1.33-xFe3xTi1.67–2xO4 (x=0.1–0.3) and Li2–2xFexTi1-xO3 (x=0.05–0.1) oxides retained cubic (Fd3m) and monoclinic (C2/c) structure and did not contain admixed phases. Li2–2xFexTi1-xO3 (x=0.05–0.1) and Li1.33- xFe3xTi1.67–2xO4 (x=0.1–0.3) samples had unit cell size a of 9.004 and 8.243–8.305 Å and crystallite size of 26.6–25.3 and 37.1–38.0 nm, respectively. There are no new absorption bands, and only a characteristic peak shift of the Ti-O bond was observed on FT-IR spectra of Li1.33- xFe3xTi1.67–2xO4 (x<0.3) and Li2–2xFexTi1-xO3 (x<0.2) samples due to heterovalent substitution of Ti atoms with Fe. The obtained samples had characteristics of a mesoporous texture, and the isotherms were irreversible, belonging to pseudo-type II and had H3-type hysteresis loops. The specific surface area and mesopore volume of the obtained samples increased slightly with raising the amount of introduced dopant from 5 to 11 m2/g and from 8 to 15 m2/g for Li1.33-xFe3xTi1.67–2xO4 and Li2–2xFexTi1-xO3, respectively. The SEM data showed the prevalence of homogeneous monolithic spherical particles with a size of ∼250 nm. The degree of conversion to the H-form reached 98 and 73–91 % for Li1.33-xFe3xTi1.67–2xO4 and Li2–2xFexTi1- xO3. The adsorption capacity of Fe3+ ion-doped oxides Li1.33- xFe3xTi1.67–2xO4 and Li2–2xFexTi1- xO3 at V/m=250 cm3/g, C(Li+)=1.0 g/L, pH=12.0 reached 59.9 and 50.3 mg/g, respectively. The high structure stability and adsorption efficiency in 5 cycles of acid regeneration for Fe3+ ion-doped oxides were observed. The obtained Li-Ti oxides doped with Fe3+ ions are of interest for further investigation as selective adsorbents of Li+ ions.
Adsorbents , Fe3+ doping , Li2TiO3 , Li4Ti5O12 , Li+ ions
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Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus, Minsk, 220072, Belarus
Faculty of Chemistry, Semnan University, Semnan, Iran
Centre of Research Impact and Outcome, Chitkara University, Punjab, Rajpura, 140417, India
University Centre for Research & Development, Chandigarh University, Punjab, Mohali, 140413, India
Department of Sustainable Engineering, Saveetha School of Engineering, SIMATS, Tamil Nadu, Chennai, 602105, India
Department of Physics, Taraz University named after M.Kh.Dulaty, Taraz, Kazakhstan
School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, China
Turin Polytechnic University in Tashkent, Tashkent, 100095, Uzbekistan
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Faculty of Chemistry
Centre of Research Impact and Outcome
University Centre for Research & Development
Department of Sustainable Engineering
Department of Physics
School of Environment and Energy
Turin Polytechnic University in Tashkent
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