Thermal behavior and antibacterial studies of a carbonate Mg–Al-based layered double hydroxide (LDH) for in vivo uses

Abstract

The goal of this work is to study the thermal behavior and the antibacterial properties of a MgAl-CO3 layered double hydroxide (LDH), which demonstrated high efficiency in removing chromium (VI) from contaminated industrial wastewater. The compound has been synthesized via co-precipitation route (direct method) followed by hydrothermal treatment, obtaining nanoscopic crystallites with a partially disordered (turbostratic) structure. After its synthesis, the compound was characterized by means of X-ray powder diffraction, field emission scanning electron microscope, inductively coupled plasma atomic emission spectroscopy and analysis and Fourier transform infrared spectroscopy. On the other hand, with the view to check the drug delivery and surgical tools usage of MgAl-CO3, antibacterial tests, performed according to the Kirby–Bauer method, revealed the inability the growth of the pathogenic bacterial strains. Thermogravimetry and differential thermal analysis revealed that evolution of water from the material occurs in two stages upon heating and a noticeable interaction takes place between water (in the vapor phase) and MgAl-CO3. Kinetic analysis of both steps provides almost constant values of activation energy, with the following average values in the range 0.1 < a < 0.9: E1 = (66 ± 9) kJ mol‒1; E2 = (106 ± 7) kJ mol‒1. Finally, prediction of reasonable reaction times extrapolated at 25 and 37 °C has been made from kinetic parameters of the first step, while almost unrealistic reaction time values were determined using the same procedure with kinetic parameters related to the second step.

Actinobacterium-Mediated Green Synthesis of CuO/Zn–Al LDH Nanocomposite Using Micromonospora sp. ISP-2 27: A Synergistic Study that Enhances Antimicrobial Activity

“…The remarkable properties of LDHs, such as their special layered structure, significant anion substitution capacity, high surface area, and high thermal stability, make them promising candidates for a wide range of applications, including as catalysts, photoresponsive materials, and drug carriers . Recent papers published in the open literature have investigated the antibacterial properties of LDH materials such as CuAl, , MgAl, − NiAl, ZnFe, , ZnMgFe, CoNiZnFe, CoAl, CuZnAl, and ZnAl. , …”

“…The novelty of our study lies in its specific focus on MO/LDH nanocomposites, which combine the advantageous properties of MO and LDHs (LDH). Although both MO ,, and LDHs ,, have individually exhibited antibacterial potential, the synergistic interactions and enhanced efficacy resulting from their combination remain largely unexplored. Through the investigation of MO/LDH nanocomposites, our study aims to bridge this gap in the literature by providing valuable insights into the combined antibacterial properties of these materials.…”

ZnAl-SO4 Layered Double Hydroxide and Allophane for Cr(VI), Cu(II) and Fe(III) Adsorption in Wastewater: Structure Comparison and Synergistic Effects

“…LDH are also called “anionic clays” owing to their characteristics as anionic exchangers [ 25 ]. The particular feature derived from their structure [ 26 ] makes these compounds promising materials for a wide range of technological applications in ion exchange/adsorption, pharmaceutics [ 27 ], electrochemistry [ 28 ], catalysis and photocatalysis. In the latter field of research, ZnAl LDH nanosheets are in the hotspot for their specific ability to fix atmospheric nitrogen with the formation of ammonia by UV light under mild conditions [ 29 ].…”