TY - JOUR
T1 - Nickel-iron layered double hydroxide (LDH)
T2 - Textural properties upon hydrothermal treatments and application on dye sorption
AU - Saiah, Fatiha Boukraa Djellal
AU - Su, Bao Lian
AU - Bettahar, Nourredine
PY - 2009/6/15
Y1 - 2009/6/15
N2 - NiFeCO3 hydrotalcites with Ni/Fe molar ratio of 3 were synthesized by co-precipitation method at constant pH, followed by hydrothermal treatment at various temperatures 85-180 °C for 3-360 h. The obtained materials were characterized by XRD analysis, FT-IR spectroscopy, SEM and TEM microscopy, TGA and BET techniques. The resulting materials were found to be similar to the hydrotalcite with a well-defined hexagonal morphology of crystallites. The hydrothermal treatment and aging time increases the platelet sizes and decreases the surface area. XRD analysis showed the formation of sharper and intense peaks, which might indicate the larger crystallites size of LDH as well as higher crystallinity. Furthermore, textural studies revealed influence of aging time and temperature on the properties of the crystalline phase. The prolonged time tends to form additional products, identified as NiFe2O4 spinel and NiO nickel oxide. The effect of hydrothermal treatment temperature on the kinetics of dye removal has been explored. It was found that the percentage color removal increases with increasing hydrothermal treatment temperature up to 140 °C and aging time up to 4 days. Furthermore, the color removal decreases with increasing hydrothermal treatment temperature up to 140-180 °C and prolonged aging time.
AB - NiFeCO3 hydrotalcites with Ni/Fe molar ratio of 3 were synthesized by co-precipitation method at constant pH, followed by hydrothermal treatment at various temperatures 85-180 °C for 3-360 h. The obtained materials were characterized by XRD analysis, FT-IR spectroscopy, SEM and TEM microscopy, TGA and BET techniques. The resulting materials were found to be similar to the hydrotalcite with a well-defined hexagonal morphology of crystallites. The hydrothermal treatment and aging time increases the platelet sizes and decreases the surface area. XRD analysis showed the formation of sharper and intense peaks, which might indicate the larger crystallites size of LDH as well as higher crystallinity. Furthermore, textural studies revealed influence of aging time and temperature on the properties of the crystalline phase. The prolonged time tends to form additional products, identified as NiFe2O4 spinel and NiO nickel oxide. The effect of hydrothermal treatment temperature on the kinetics of dye removal has been explored. It was found that the percentage color removal increases with increasing hydrothermal treatment temperature up to 140 °C and aging time up to 4 days. Furthermore, the color removal decreases with increasing hydrothermal treatment temperature up to 140-180 °C and prolonged aging time.
KW - Adsorption
KW - Anionic clays
KW - Crystallinity
KW - Hydrothermal treatment
KW - Textile dye
UR - http://www.scopus.com/inward/record.url?scp=64549136649&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2008.09.125
DO - 10.1016/j.jhazmat.2008.09.125
M3 - Article
C2 - 19155131
AN - SCOPUS:64549136649
SN - 0304-3894
VL - 165
SP - 206
EP - 217
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -