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Sains Malaysiana 40(8)(2011): 887–896
Synthesis of Dichlorprop-Zn/Al-hydrotalcite Nanohybrid and
its Controlled Release Property
(Sintesis
Nanohibrid Diklorprop-Zn/Al-hidrotalsit dan Sifat Lepasan Terkawalnya)
Mohd Zobir Hussein* & Norhayati Hashim
Advanced Materials and Nanotechnology Laboratory, Institute
of Advanced Technology (ITMA)
Department of Chemistry, Universiti Putra Malaysia, 43400
Serdang, Selangor, D.E. Malaysia
Zulkarnain
Zainal
Department
of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang,
Selangor, D.E. Malaysia
Asmah
Hj. Yahaya
Centre
of Foundation Studies for Agricultural Science, Universiti Putra Malaysia, 43400
Serdang,
Selangor
D.E. Malaysia
Diserahkan:
22 Mac 2010 / Diterima: 9 Ogos 2010
ABSTRACT
New phase-pure nanohybrids
of dichlorprop[2(2,4-dichlorophenoxy)propionate]-intercalated Zn/Al-LDH were
successfully prepared using either co-precipitation or ion exchange methods.
The basal spacing expansion from 8.9 Å in the layered double hydroxide (LDH)
to 18.7 and 21.7 Å of the nanohybrids was observed. This together with FTIR, DTG/TGA and
compositional studies show that dichlorprop was successfully intercalated into
the Zn/Al-layered double hydroxides interlayer. Release study of dichlorprop
showed that it is dependent on the concentration of the incoming ionic species
and governed by the pseudo-second order kinetic. This study suggests that the
layered double hydroxide might be used as a matrix for controlled release
formulation for a herbicide, dichlorprop and the release of the herbicide can
be tuned using parameters such as method of synthesis and the concentration of
the incoming ionic species to be ion exchange with. This is towards new
generation of agrochemicals which are safer as well as user- and
environmentally-friendly.
Keywords: Dichlorprop;
layered double hydroxide; nanohybrids; pseudo-second order kinetic
ABSTRAK
Fasa tulen bahan baru
nanohibrid, diklorprop 2(2,4-diklorofenonoksi) propionat terinterkalasi ke
dalam lapisan Zn/Al-LDH telah berjaya disediakan dengan
menggunakan sama ada kaedah pemendakan atau pertukaran ion. Didapati terdapat
pengembangan jarak basal daripada 8.9 Å bagi LDH kepada
18.7 dan 21.7 Å bagi nanohibrid. Ini, berserta kajian FTIR, DTG/TGA dan
kajian komposisi menunjukkan bahawa diklorprop telah berjaya diinterkalasikan
ke dalam lapisan hidroksida berganda Zn/Al. Kajian lepasan diklorprop
menunjukkan lepasan bergantung kepada kepekatan spesis ion mendatang dan
mematuhi kinetik tertib pseudo-kedua. Kajian ini menunjukkan bahawa lapisan
berganda hidroksida sesuai digunakan sebagai matrik formulasi lepasan terkawal
bagi racun rumpai, diklorprop dan lepasan racun rumpai ini boleh dilaraskan
dengan menggunakan parameter cara mensintesis dan kepekatan spesies ion yang
boleh ditukar ganti. Ini adalah ke arah penjanaan bahan agrokimia generasi baru
yang lebih selamat, mesra pengguna serta mesra alam.
Kata kunci: Diklorprop; kinetik tertib pseudo-kedua; lapisan
berganda hidroksida; nanohibrid
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*Pengarang untuk surat-menyurat; email: mzobir@science.upm.edu.my
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