Layered double hydroxides (LDHs) have received wide attention
as an effective adsorbent in recent years because of their structure
and high anionic exchange capacity. LDHs are generally expressed
as [M1x
2+Mx
3+(OH)2][An]x/nyH2O, where M2+ and M3+ are
divalent and trivalent metal cations, An is the incorporated anions
in the interlayer space along with water molecules for charge neutrality
and structure stability, and x normally ranges from 0.17 to
0.33 [1]. LDHs are layered materials with hydroxide sheets, where
a net positive charge is developed on the layer because of partial
substitution of trivalent for divalent cations [2]. Since the interlayer
anions are easily exchangeable, it makes LDHs available for
anions removal by adsorption. Due to the high charge density of
the sheets and the exchangeability of the interlayer anions as well,
h