Mg-Al-La LDH-MnFe2O4 hybrid material for facile removal of anionic dyes from aqueous solutions

0498856 - ÚACH 2020 RIV NL eng J - Journal Article
Mrózek, Ondřej - Ecorchard, Petra - Vomáčka, Petr - Ederer, J. - Smržová, Darina - Šrámová Slušná, Michaela - Machálková, Aneta - Nevoralová, Martina - Beneš, Hynek
Mg-Al-La LDH-MnFe2O4 hybrid material for facile removal of anionic dyes from aqueous solutions.
Applied Clay Science. Roč. 169, MAR (2019), s. 1-9. ISSN 0169-1317. E-ISSN 1872-9053
R&D Projects: GA ČR(CZ) GA17-08273S; GA MŠMT(CZ) LM2015073
Institutional support: RVO:61388980 ; RVO:61389013
Keywords : Acid orange 7 * Adsorption * Mg-Al-La layered double hydroxides * MnFe2O4 nanoparticles * Urea method
OECD category: Inorganic and nuclear chemistry; Polymer science (UMCH-V)
Impact factor: 4.605, year: 2019
Method of publishing: Open access with time embargo

The urea hydrolysis method was applied to prepare Mg-Al-La layered double hydroxides (LDH) and its hybrids with different amounts of magnetic MnFe2O4 nanoparticles. The new hybrid materials were characterized by X-ray powder diffraction, FTIR and Raman spectroscopy, AFM, SEM, TEM/EDX microscopic methods, BET specific surface area determination and inductively coupled plasma (ICP). The AFM and TEM/EDX analyses clearly showed MnFe2O4 nanoparticles to be predominantly localized on the surface of LDH sheets. Almost two-fold increase of the specific surface area was observed for the Mg-Al-La LDH-MnFe2O4 hybrids compared to the pristine LDH. All synthesized hybrids were studied for their adsorption capacities of Acid orange 7 dye. The adsorption studies were measured at pH 4.0, 7.0 and 10.0. The resulting data were fitted by Langmuir and Langmuir-Freundlich models. The Langmuir isotherm model exhibited a maximum adsorption capacity of Acid orange 7 dye (687.9 mg/g) for Mg-Al-La LDH-MnFe2O4 hybrid material. The lower pH positively affected higher adsorption capacity of Acid orange 7 dye. The prepared Mg-Al-La LDH-MnFe2O4 hybrid materials thus showed to be new promising adsorbents of anionic dyes.
Permanent Link: http://hdl.handle.net/11104/0293774