Synthesis and Characterization of Methanesulfonate and Ethanesulfonate Intercalated Lithium Aluminum LDHs

• 作者: Anton Niksch Herbert Pöllmann
• 来源期刊: 自然资源(英文)
• 学科: 化学
• 关键词: LDH LITHIUM Aliphatic Sulfonic Acid X-Ray Powder Diffraction High Temperature PXRD Layered Double Hydroxides SULFONATE
• 年，卷（期）: zrzyyw_2021,（3）
• 页码范围: 59-71
• 页数: 13页
• 分类号: O62

摘要

<span style="font-family:Verdana;"> <span style="font-family:;" "="">LDH-phases become increasingly interesting due to their broad ability to be able to incorporate many different cat</span><span style="font-family:;" "="">ions</span><span style="font-family:;" "=""> and anions. The intercalation of methanesulfonate and ethanesulfonate into a Li-LDH as well as the behavior of the interlayer structure as a function of the temperature is presented. A hexagonal P6₃/m [LiAl₂(OH)₆][Cl?1</span><span style="font-family:;" "="">.</span><span style="font-family:;" "="">5H₂O] (Li-Al-Cl) precursor LDH was synthesized by hydrothermal treating of a LiCl solution with <i>γ</i>-Al(OH)₃. This precursor was used to intercalate methanesulfonate (CH₃O₃S^?) and ethanesulfonate (C₂H₅O₃S^?) through anion exchange by stirring Li-Al-Cl in a solution of the respective organic Li-salt (90?C, 12 h). X-ray diffraction pattern showed an increase of the interlayer space <i>c</i></span><i><span style="font-family:;" "="">'</span></i><span style="font-family:;" "=""> (d₀₀₁) of Li-Al-methanesulfonate (Li-Al-MS) with 1.2886 nm and Li-Al-ethanesulfonate (Li-Al-ES) with 1.3816 nm compared to the precursor with 0.7630 nm. Further investigations with Fourier-transform infrared spectroscopy and scanning electron microscopy confirmed a complete anion exchange of the organic molecules with the precursor Cl^?. Both synthesized LDH compounds [LiAl₂(OH)₆]CH₃SO₃?nH₂O (n = 2.24</span><span style="font-family:;" "="">-</span><span style="font-family:;" "="">3.72 (Li-Al-MS) and [LiAl₂(OH)₆]C₂H₅SO₃}?nH₂O (n = 1.5) (Li-Al-ES) showed a monomolecular interlayer structure with additional interlayer water at room temperature. By increasing the temperature, the interlayer water was removed and the i