Facile synthesis of Cu-LDH with different Cu/Al molar ratios: application as antibacterial inhibitors
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Facile synthesis of Cu‑LDH with different Cu/Al molar ratios: application as antibacterial inhibitors Hadja Alia Tabti1 · Mehdi Adjdir2,3 · Abdelkader Ammam4 · Baghdad Mdjahed5 · Brahim Guezzen5 · Amina Ramdani6 · Choukry Kamel Benddedouche7 · Noria Bouchikhi1 · Nadir Chami8 Received: 8 July 2020 / Accepted: 3 September 2020 © Springer Nature B.V. 2020
Abstract A range of Cu-LDHs has been synthesized by co-precipitation using metal nitrate precursors and sodium carbonate under varying molar ratios Cu/Al (Cu0.05–Al0.15, Cu0.10–Al0.10, Cu0.14–Al0.06, and Cu0.15–Al0.05). The uncalcined and calcined CuLDHs were characterized by powder X-ray diffraction and N2 adsorption–desorption. The uncalcined solids showed clear hydrotalcite-like crystalline phases having a particle measurement between 5 and 16 nm. The best structure is attributed to the sample Cu0.05–Al0.15-LDHs. The particular surface areas are ranging between 40 and 92 m2/g, while the calcined samples showed the formation of Cu and Mg oxides. The antibacterial activity of Cu-LDHs with various molar ratios Cu/Al and their calcined phases were estimated towards multiple types of bacteria (Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and Bacillus Subtilis). The Cu0.10–Al0.10-LDHs sample shows high activity against all types of bacteria either for calcined or uncalcined materials. The obtained results of the application of Cu-LDHs antibacterial inhibitors seem to be quite promising material in the antibacterial fields. Keywords LDHs · Calcination · Copper · XRD · N2-sorption · Size · Antibacterial inhibition
* Hadja Alia Tabti [email protected] * Mehdi Adjdir mehdi.adjdir@daad‑alumni.de Extended author information available on the last page of the article
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Introduction Layered double hydroxides (LDHs) are known as anionic clays or hydrotalcite based on the structure of Brucite charged positively (Mg(OH)2). LDHs can be described x− by the general formula: [ M2+ M3+(OH)2]x+[An− where, M 2+ denotes bivax/y·y·H2O] 2+ 2+ 2+ 3+ lent cations as (Cu , Mg , Zn ) and M as trivalent cations (Al3+, Fe3+, Cr3+. ect). Both bivalent and trivalent cations occupy octahedral coordination with six OH groups. The principal interest of the layered double hydroxide lies in the possibility of modifies the layers by insertion or substitution of divalent and trivalent cations. Layered double hydroxides can contain different types of divalent and trivalent cations like magnesium; aluminium; zinc, nickel [1], cobalt [2], chrome; iron, and gallium ions [3] except for copper. The incompatibility of copper in the octahedral networks of the hydrotalcite-like phase is explained to the effect distortion of Jahn–Teller. In this case, various works have been published for the synthesis of LDHs with copper. Yamoka et al. [4] reviewed the synthesis of LDHs with different molar ratios of Cu/Al; the layered double hydroxide obtained has a layered structure that is included in the monocl
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