TY - JOUR
T1 - Removal of antimonate ions and simultaneous formation of a brandholzite-like compound from magnesium-aluminum oxide
AU - Kameda, Tomohito
AU - Honda, Masaaki
AU - Yoshioka, Toshiaki
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2011/7/29
Y1 - 2011/7/29
N2 - Magnesium-aluminum oxide (Mg-Al oxide), obtained by thermal decomposition of a Mg-Al layered double hydroxide (Mg-Al LDH), was found to remove Sb(OH) 6 (Sb(V)) in solution because of rehydration, and to combine with Sb(V) to form a brandholzite-like structure. Although the Sb concentration decreased with increasing amounts of Mg-Al oxide, differences in the Mg/Al molar ratio had little effect on this relationship. The removal of Sb(V) in solution by Mg-Al oxide was partially prevented by coexistent anions with high charge densities (SO42- and CO32-). In this case, Mg-Al oxide likely rehydrates and competitively combines with Sb(V) in solution to construct a brandholzite-like structure or with anions to reconstruct the LDH structure. However, in the case of coexistent anions with low charge densities (Cl and OH), Mg-Al oxide likely rehydrates and preferentially combines with Sb(V) in solution to construct the brandholzite-like structure. A high concentration of Cl and SO2- 4 had little effect on the decrease in Sb concentration, whereas a high concentration of CO2-3 had a large effect.
AB - Magnesium-aluminum oxide (Mg-Al oxide), obtained by thermal decomposition of a Mg-Al layered double hydroxide (Mg-Al LDH), was found to remove Sb(OH) 6 (Sb(V)) in solution because of rehydration, and to combine with Sb(V) to form a brandholzite-like structure. Although the Sb concentration decreased with increasing amounts of Mg-Al oxide, differences in the Mg/Al molar ratio had little effect on this relationship. The removal of Sb(V) in solution by Mg-Al oxide was partially prevented by coexistent anions with high charge densities (SO42- and CO32-). In this case, Mg-Al oxide likely rehydrates and competitively combines with Sb(V) in solution to construct a brandholzite-like structure or with anions to reconstruct the LDH structure. However, in the case of coexistent anions with low charge densities (Cl and OH), Mg-Al oxide likely rehydrates and preferentially combines with Sb(V) in solution to construct the brandholzite-like structure. A high concentration of Cl and SO2- 4 had little effect on the decrease in Sb concentration, whereas a high concentration of CO2-3 had a large effect.
KW - Antimonate
KW - Brandholzite
KW - Magnesium-aluminum oxide
KW - Removal
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U2 - 10.1016/j.seppur.2011.04.032
DO - 10.1016/j.seppur.2011.04.032
M3 - Article
AN - SCOPUS:84859894520
VL - 80
SP - 235
EP - 239
JO - Gas Separation and Purification
JF - Gas Separation and Purification
SN - 1383-5866
IS - 2
ER -