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

 

Received: 22 March 2010 / Accepted: 9 August 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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*Corresponding author; email: mzobir@science.upm.edu.my

 

 

 

 

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