TITLE:
Synthesis and controlled release of cloprop herbicides from cloprop-layered double hydroxide and cloprop-zinc-layered hydroxide nanocomposites
AUTHORS:
Norhayati Hashim, Mohd Zobir Hussein, Illyas Md Isa, Azlan Kamari, Azmi Mohamed, Adila Mohamad Jaafar, Hafsah Taha
KEYWORDS:
Cloprop; Cloprop-Layered Double Hydroxide; Cloprop-Zinc-Layered Hydroxide; Nanocomposite; Controlled Release; Kinetic Study
JOURNAL NAME:
Open Journal of Inorganic Chemistry,
Vol.4 No.1,
January
2,
2014
ABSTRACT: Two phenoxyherbicide
nanocomposites, namely cloprop-layered double hydroxide and cloprop-zinc-
layered hydroxide nanocomposites, have been synthesized by using co-precipitation and direct reaction method.
PXRD pattern showed an expansion of interlayer spacing with the value of 21.0 Å and 22.7 Å for cloprop-layered double hydroxide and cloprop-zinc-layered
hydroxide nanocomposite, respectively. It is evident from FTIR and elemental
analyses that both nanocomposites were successfully intercalated between the
interlayers of layered metal hydroxide. Controlled release of cloprop anion
from interlayer of nanocomposites for both cloprop-layered double hydroxide
and cloprop-zinc-layered hydroxide nanocomposite into phosphate solution was
rapid initially and slow thereafter. The percentage of accumulated release of
cloprop anion from cloprop-zinc-layered hydroxide nanocomposite was slightly
higher than that from cloprop-layered double
hydroxide nanocomposite. Kinetic
behavior of cloprop release was governed by pseudo-second-order for cloprop-layered double hydroxide
nanocomposite while parabolic diffusion for
cloprop-zinc-layered hydroxide nanocomposite. Results from this study highlight
the potential of both nanocomposites as capsulated material for controlled
release of cloprop phenoxyherbicides anion.