The formation of different Mg-Al LDHs (Mg/Al=2:1) under hydrothermal conditions and their application for Zn2+ ions removal
The formation of different Mg-Al LDHs (Mg/Al = 2:1) under hydrothermal conditions (200°C; 4-24 h) was investigated in the 4MgCO3⋅Mg(OH)2⋅5H2O - γ-Al2O3/Al(OH)3 - H2O and Mg5(CO3)4(OH)2•4H2O - γ-Al2O3 - H2O systems. It was determined that chemical nature of the initial Mg containing componen...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
International Institute for the Science of Sintering, Beograd
2014-01-01
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| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2014/0350-820X1401095B.pdf |
| Summary: | The formation of different Mg-Al LDHs (Mg/Al = 2:1) under hydrothermal
conditions (200°C; 4-24 h) was investigated in the 4MgCO3⋅Mg(OH)2⋅5H2O -
γ-Al2O3/Al(OH)3 - H2O and Mg5(CO3)4(OH)2•4H2O - γ-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
4MgCO3⋅Mg(OH)2⋅5H2O as starting material while hydroxide hydrate in the
Mg5(CO3)4(OH)2•4H2O 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). |
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| ISSN: | 0350-820X 1820-7413 |