Sol-gel synthesis, structure and adsorption properties of LiMgxMn(2-x)O4 (0 ≤ x ≤ 0.7) Oxides

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Lithium manganese оxides with a spinel structure LiMgxMn(2–x)O4, doped with Mg2+ ions in the range 0 ≤ x ≤ 0.7, were obtained by sol-gel synthesis. Phase composition and morphology of obtained оxides were studied by using X-ray phase analysis and scanning electron microscopy. It is shown, that in the studied range 0 ≤ x ≤ 0.7 Mg-doped lithium manganese оxides saved the structure of the original cubic spinel LiMn2O4, while an increase in parameter a was observed from 8.175 to 8.309 Å and average crystallite size practically unchanged (30–36 nm). Samples of the initial LiMn2O4 and Mg-doped spinels were represented by prismatic particles of submicron (0.1–0.2 µm) and micron (1.0–3.0 µm) sizes, respectively. The effect of the adsorbent dose (0.05–0.3 g/l) and pH (3.0–13.0) of the solution on the adsorption efficiency was studied. The adsorption isotherms of the LiMg0.3Mn1.7O4 samples were described by the Langmuir monomolecular adsorption equation. An increase in the temperature of the model solution from 25 to 45°C was accompanied by an increase in the maximum adsorption of the LiMg0.3Mn1.7O4 samples from 10.50 to 10.98 mmol/g, which indicates the endothermic nature of the adsorption process. The kinetics of adsorption was well described by a pseudo-second order equation, which indicates the occurrence of chemical interaction during the adsorption process.

作者简介

Sh. Begimkulova

Rashidov Samarkand State University

编辑信件的主要联系方式.
Email: bshahnoza0206@gmail.com
乌兹别克斯坦, Samarkand, 140100

A. Nasimov

Rashidov Samarkand State University

Email: bshahnoza0206@gmail.com
乌兹别克斯坦, Samarkand, 140100

O. Ruzimuradov

Turin Polytechnic University in Tashkent

Email: bshahnoza0206@gmail.com
乌兹别克斯坦, Tashkent, 100095

V. Prozorovich

Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus

Email: bshahnoza0206@gmail.com
白俄罗斯, Minsk, 220072

A. Ivanets

Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus

Email: bshahnoza0206@gmail.com
白俄罗斯, Minsk, 220072

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