Title The formation of different Mg–Al LDHs (Mg/Al = 2:1) under hydrothermal conditions and their application for Zn2+ ions removal /
Authors Bankauskaite, A ; Baltakys, K
DOI 10.2298/SOS1401095B
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Is Part of Science of sintering.. Belgrade : International institute for the science of sintering. 2014, vol. 46, no. 1, p. 95-106.. ISSN 0350-820X. eISSN 1820-7413
Keywords [eng] Hydrothermal synthesis ; Meixnerite-type layered double hydroxide ; Hydrotalcite ; Zn2+ ion removal
Abstract [eng] The formation of different Mg-Al LDHs (Mg/Al = 2:1) under hydrothermal conditions (200 degrees C; 4-24 h) was investigated in the 4MgCO(3)center dot Mg(OH)(2)center dot 5H(2)O - gamma-Al2O3/Al(OH)(3) - H2O and Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O - gamma-Al2O3 - H2O systems. It was determined that chemical nature of the initial Mg containing components changes the formation mechanism of the synthesis products during isothermal curing. Magnesium aluminum hydroxide hydrate is crystallized by using 4MgCO(3)center dot Mg(OH)(2)center dot 5H(2)O as starting material while hydroxide hydrate in the Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O presence. The sequence of the compounds formation is presented. It should be noted that different modifications of Al containing components have only a slight influence on the meixnerite-type LDH hydrothermal synthesis. It was determined that after 45 min of sorption all Zn2+ ions are incorporated into the crystal structure of hydrotalcite. It should be underlined that crystallinity of the latter compound do not change during ion exchange experiments. Thus, the latter compound can be used as adsorbent for Zn2+ ion removal. Synthesized samples were characterized by powder X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), simultaneous thermal analysis (STA) and scanning electron microscopy (SEM).
Published Belgrade : International institute for the science of sintering
Type Journal article
Language English
Publication date 2014
CC license CC license description