二氧化钛冠醚复合材料对稀土阳离子的吸附研究

IF 0.8 4区 化学 Q4 CHEMISTRY, PHYSICAL
Yu. V. Rekh, M. S. Valova, O. V. Koryakova, A. N. Murashkevich, O. V. Fedorova, G. L. Rusinov
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引用次数: 0

摘要

在混合氧化物SiO2-TiO2的溶胶-凝胶合成过程中,通过固定冠醚(二苯并-18-冠-6,二苯并-21-冠-7,二苯并-24-冠-8),获得了在无机基质中牢固地固定有机分子的复合材料,通过红外光谱和元素分析证实了这一点。研究了在酸性和中性条件下对稀土离子的吸附性能。吸附效率(S, %)和吸附容量(Q, mg/g)在从初始氧化物和冠醚转移到它们的复合物时显著增加。复合材料对稀溶液(2 × 10−4 mol/dm3)中稀土离子的吸附量为89.1 ~ 95.1%,对稀土元素浓溶液(0.1 mol/dm3)的吸附量为6.1 ~ 34.5 mg/g。采用等温Langmuir (R2 = 0.9915)、Freundlich (R2 = 0.8745)、Temkin (R2 = 0.9506)和Dubinin-Radushkevich (R2 = 0.9754)模型研究了复合材料二苯并-18冠-6 - sio2 - tio2对镧阳离子的吸附。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sorption of Rare Earth Cations by SiO2–TiO2-Crown Ether Composites

Sorption of Rare Earth Cations by SiO2–TiO2-Crown Ether Composites

Sorption of Rare Earth Cations by SiO2–TiO2-Crown Ether Composites

The immobilization of crown ethers (dibenzo-18-crown-6, dibenzo-21-crown-7, dibenzo-24-crown-8) during the sol–gel synthesis of mixed oxides SiO2–TiO2 is used to obtain composites that firmly hold an organic molecule in an inorganic matrix, as is confirmed via IR spectroscopy and elemental analysis. The properties of sorption with respect to rare earth element (REE) cations are studied under acidic and neutral conditions. The efficiency (S, %) and capacity (Q, mg/g) of sorption grow substantially upon moving from the initial oxides and crown ethers to their composites. The sorption of REE cations from dilute solutions (2 × 10−4 mol/dm3) is found to be 89.1–95.1% for composite dibenzo-18-crown-6–SiO2–TiO2, whose sorption capacity for concentrated solutions of rare earth elements (0.1 mol/dm3) is 6.1–34.5 mg/g. The sorption of lanthanum cations by composite dibenzo-18-crown-6–SiO2–TiO2 is studied using the isothermal Langmuir (R2 = 0.9915), Freundlich (R2 = 0.8745), Temkin (R2 = 0.9506), and Dubinin–Radushkevich (R2 = 0.9754) models.

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来源期刊
CiteScore
1.20
自引率
14.30%
发文量
376
审稿时长
5.1 months
期刊介绍: Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.
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