Sh. A. Begimkulova, A. M. Nasimov, O. N. Ruzimuradov, V. G. Prozorovich, A. I. Ivanets
{"title":"Sol-Gel Synthesis, Structure, and Adsorption Properties of LiMgxMn(2 – x)O4 (0 ≤ x ≤ 0.7) Oxides","authors":"Sh. A. Begimkulova, A. M. Nasimov, O. N. Ruzimuradov, V. G. Prozorovich, A. I. Ivanets","doi":"10.1134/s0036023624600485","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Lithium manganese oxides with a spinel structure LiMg<sub><i>x</i></sub>Mn<sub>(2 –</sub> <sub><i>x</i>)</sub>O<sub>4</sub> doped with Mg<sup>2+</sup> ions in the range 0 ≤ <i>x</i> ≤ 0.7, were obtained by sol-gel synthesis. Phase composition and morphology of obtained oxides were studied by X-ray powder diffraction and scanning electron microscopy. It is shown, that in the studied range 0 ≤ <i>x</i> ≤ 0.7 Mg-doped lithium manganese oxides saved the structure of the original cubic spinel LiMn<sub>2</sub>O<sub>4</sub>, while an increase in parameter <i>a</i> was observed from 8.175 to 8.309 Å and average crystallite size practically unchanged (30–36 nm). Samples of the initial LiMn<sub>2</sub>O<sub>4</sub> spinel and Mg-doped spinel consisted of 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 samples LiMg<sub>0.3</sub>Mn<sub>1.7</sub>O<sub>4</sub> 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 LiMg<sub>0.3</sub>Mn<sub>1.7</sub>O<sub>4</sub> 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.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"49 1","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Inorganic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1134/s0036023624600485","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
Lithium manganese oxides 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 oxides were studied by X-ray powder diffraction and scanning electron microscopy. It is shown, that in the studied range 0 ≤ x ≤ 0.7 Mg-doped lithium manganese oxides 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 spinel and Mg-doped spinel consisted of 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 samples LiMg0.3Mn1.7O4 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.
期刊介绍：
Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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