Environmental Engineering Reference
In-Depth Information
(a)
(b)
{200}
20 nm
2 nm
(c)
(d)
MgK
FK
OK
FIGURE 19.2
(a, b) High-resolution transmission electron micrographs of NM. Inset of the panel b is a photograph of the
as-synthesized NM. (c) Scanning electron microscopy (SEM) micrographs of NM. (d) Elemental x-ray images
of NM (MgKα, OKα, and FKα) after reacting with luoride. (From S.M. Maliyekkal, Anshup, K.R. Antony, and
T. Pradeep,
Sci. Total Environ
., 408, 2273, 2010.)
MgO
MgO
MgO
MgO
MgO
Mg(OH)
2
Mg(OH)
2
Mg(OH)
2
Mg(OH)
2
Mg(OH)
2
+
H
2
O
Mg(OH)
2-y
F
y
Mg(OH)
2-y
F
y
Mg(OH)
2-y
F
y
Mg(OH)
2-y
F
y
Mg(OH)
2-y
F
y
+
F
-
FIGURE 19.3
Scheme showing the mechanism of luoride adsorption onto NM. (From S.M. Maliyekkal, Anshup, K.R. Antony,
and T. Pradeep,
Sci. Total Environ
., 408, 2273, 2010.)