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Abstract <p>Layered double hydroxides (LDHs) belong to a class of layered materials with a general chemical formula of [[M<sup>II</sup><sub>1-x</sub>M<sup>III</sup><sub>x</sub>(OH)<sub>2</sub>]<sup>x+</sup>(A<sup>m−</sup>)<sub>x/m</sub>]·nH<sub>2</sub>O. In this study, the Mg<sub>2</sub>Al<sub>1</sub>, Mg<sub>2-x</sub>Zn<sub>x</sub>Al<sub>1</sub> and Mg<sub>2</sub>Al<sub>1-x</sub>La<sub>x</sub> LDHs were successfully synthesized by a simple sol-gel synthetic approach. It was demonstrated that using sol-gel technique around 25% mol of magnesium could be replaced successfully by zinc in Mg<sub>2</sub>Al<sub>1</sub> LDHs without destroying the layered structure. However, the smaller amount of lanthanum (up to 5% mol) was introduced instead of aluminum. The FTIR and Raman spectroscopy results confirmed the high reproducibility of the sol-gel processing method used in this study for preparing non-substituted and metal-substituted LDH samples. The Mg<sub>1.5</sub>Zn<sub>0.5</sub>Al<sub>1</sub> and Mg<sub>2</sub>Al<sub>0.95</sub>La<sub>0.05</sub> samples consisted of homogeneously distributed plate-like crystallites, with an average particle size of approximately 50–200 nm, although some particles have reached micrometer sizes. The N<sub>2</sub> adsorption-desorption isotherms for all sol-gel derived LDHs were quite similar. The evaluation of the antibacterial properties of the synthesised samples revealed zones of inhibition for LDHs in the presence of Gram-negative <i>Escherichia coli</i> (<i>E. coli</i>) and Gram-positive <i>Bacillus cereus</i> (<i>B. cereus</i>), suggesting that the effective inhibition depends on nature and concentration of metal ions.</p> Graphical Abstract <p></p>

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Sol-gel synthesis, characterization and application of metal-substituted Mg2-xZnxAl1 and Mg2Al1-xLax layered double hydroxides

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Gabriele Klydziute,
  • Laura Gliaudyte,
  • Denis Sokol,
  • Dovile Vasiliauskiene,
  • Thomas Chung-Kuang Yang,
  • Aivaras Kareiva

摘要

Abstract

Layered double hydroxides (LDHs) belong to a class of layered materials with a general chemical formula of [[MII1-xMIIIx(OH)2]x+(Am−)x/m]·nH2O. In this study, the Mg2Al1, Mg2-xZnxAl1 and Mg2Al1-xLax LDHs were successfully synthesized by a simple sol-gel synthetic approach. It was demonstrated that using sol-gel technique around 25% mol of magnesium could be replaced successfully by zinc in Mg2Al1 LDHs without destroying the layered structure. However, the smaller amount of lanthanum (up to 5% mol) was introduced instead of aluminum. The FTIR and Raman spectroscopy results confirmed the high reproducibility of the sol-gel processing method used in this study for preparing non-substituted and metal-substituted LDH samples. The Mg1.5Zn0.5Al1 and Mg2Al0.95La0.05 samples consisted of homogeneously distributed plate-like crystallites, with an average particle size of approximately 50–200 nm, although some particles have reached micrometer sizes. The N2 adsorption-desorption isotherms for all sol-gel derived LDHs were quite similar. The evaluation of the antibacterial properties of the synthesised samples revealed zones of inhibition for LDHs in the presence of Gram-negative Escherichia coli (E. coli) and Gram-positive Bacillus cereus (B. cereus), suggesting that the effective inhibition depends on nature and concentration of metal ions.

Graphical Abstract