Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2023 Volume 21, Issue 1
English Ukrainian
Get the article →
vol year page
Issues PACS For subscribers For authors
Search →
Advanced Search

Issues

 / 

2023

 / 

vol. 21 / 

Issue 1

 


Download the full version of the article (in PDF format)

². Bei, Î. Slisenko, V. Budzinska, and O. Tolstov
Preparation, Structural and Sorption Characteristics of Layered Double Hydroxides ÌxAly(OH)z (M = Zn2+, Mg2+, Ni2+)
0099–0111 (2023)

PACS numbers: 61.05.cp, 61.66.Fn, 68.43.Mn, 78.30.Hv, 81.20.Fw, 81.70.Pg, 82.33.Pt

Layered double hydroxides (LDH) based on trivalent Al3+ and bivalent Ni2+, Zn2+ and Mg2+ ionic composition are prepared by precipitation of mixed hydroxides from aqueous solutions of corresponding salts at continuous control of pH value. In accordance with wide-angle x-ray scattering (WAXS) analysis, the synthesis conditions provide required structuration level for LDH formation. The peaks on WAXS diffractograms at angle positions of ≅ 12°, ≅ 24°, ≅ 36° and ≅ 41° as well as calculated interlayer spacing in the range of 7.4–8.8 Å demonstrate the specific structure characteristics, which are typical for synthetic LDH similar with natural hydrotalcite. Studying the features of thermogravimetric (TGA) behaviour of synthesized LDH shows a certain level of their hydrophilicity. We suppose that layered structure and capillary effects provide a moisture absorption level as high as 23% by weight. The LDH samples are characterized by four stages of weight loss. The temperature-induced water desorption (< 140 °Ñ), dehydration of metal hydroxides of LDH (140–355°Ñ) as well as thermal destruction of structure-stabilizing anions in interlayer space (> 235) have determined composition-dependent characteristic peculiarities for each LDH type. Ion-exchange activity of synthesized LDH is tested using water-soluble dyes, namely, methyl orange (MO), eosine N (EN) and rhodamine B (RB), which have clear differences in chemical structure. As found, the ion-exchange ability of LDH to the cationic- and anionic-dye types is a structure-dependent parameter. Obtained LDH are efficient anionic sorbents for MO dye molecules due to a presence of the strong acidic –SO3--groups. Sorption capacity γ for MO in aqueous media reaches 121 μmole/g, whereas overall sorption efficacy ϕ is in a range of 50–97%. At the same time, all LDH demonstrate reduced efficacy for adsorption of EN dye. The sorption capacity γ and efficacy ϕ for EN are in a range of 12–109 μmole/g and 9–82%, respectively. We suppose that reducing sorption efficacy affects a weak acidity of anionic –COO--group in EN molecule. Cationic RB dye does not absorb by LDH (γ parameter is below 6 μmole/g) due to impact of repulsive electrostatic forces between positively charged dye molecules and anion-exchange centres of composite substrates.

Key words: layered double hydroxides, synthetic clays, structure, thermal analysis, adsorption, ion exchange.

https://doi.org/10.15407/nnn.21.01.099

References
  1. C. Forano, T. Hibino, F. Leroux, and C. Taviot-Gueho, Developments in Clay Science (Eds. B. Faiza and L. Gerhard) (Amsterdam: Elsevier: 2006), vol. 1, p. 1021.
  2. C. Forano, U. Costantino, V. Prevot, and C. T. Gueho, Developments in Clay Science (Eds. B. Faiza and L. Gerhard) (Amsterdam: Elsevier: 2013), vol. 5, p. 745.
  3. P. Benito, M. Herrero, C. Barriga, F. M. Labajos, and V. Rives, Inorg. Chem., 47: 5453 (2008); https://doi.org/10.1021/ic7023023
  4. K. Okamoto, N. Iyi, and T. Sasaki, Appl. Clay Sci., 37: 23 (2007); https://doi.org/10.1016/j.clay.2006.10.008
  5. A. Inayat, M. Klumpp, and W. Schwieger, Appl. Clay Sci., 51: 452 (2011); https://doi.org/10.1016/j.clay.2011.01.008
  6. M. Jitianu, M. Zaharescu, M. Balasoiu, and A. Jitianu, J. Sol–Gel Sci. Technol., 26: 217 (2003); https://doi.org/10.1023/A:1020747031524
  7. F. J. W. J. Labuschagne, A. Wiid, H. P. Venter, B. R. Gevers, and A. Leuteritz, Green Chem. Lett. Rev., 11, No. 1: 18 (2018); https://doi.org/10.1080/17518253.2018.1426791
  8. https://rruff.info/hydrotalcite/R050457
  9. S. Mandal, D. Tichit, D. A. Lerner, and N. Marcotte, Langmuir, 25: 10980 (2009); https://doi.org/10.1021/la901201s
Creative Commons License
This article is licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License
©2003—2023 NANOSISTEMI, NANOMATERIALI, NANOTEHNOLOGII G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine.
E-mail: tatar@imp.kiev.ua Phones and address of the editorial office About the collection User agreement