UPSI Digital Repository (UDRep)
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Abstract : Universiti Pendidikan Sultan Idris |
This research aimed to synthesis active agent-zinc layered hydroxide intercalated
agrochemical nanocomposites namely zinc layered hydroxide-sodium dodecyl
sulphate-isoprocarb (ZLH-SDS-ISO), zinc layered hydroxide-sodium dodecyl
sulphate-propoxur (ZLH-SDS-PRO) and zinc layered hydroxide-sodium dodecyl
sulphate-thiacloprid (ZLH-SDS-THI) using ion exchange method for pest control. Surface
modification of nanocomposites was performed using chitosan and cellulose acetate. The
nanocomposites were characterized using powder x-ray diffraction (PXRD), Fourier transform
infrared (FTIR), elemental analysis, thermogravimetric and differential thermogravimetric
analysis (TGA/DTG), field emission scanning electron microscope (FESEM), and surface area
analysis. The results of PXRD patterns showed the basal spacing in the range of 30.1
Å to 33.1 Å support the successful intercalation process. FTIR spectra for all
nanocomposites showed the presence of anion in the interlayer of the nanocomposite. Release study
showed that phosphate solution yielded highest percentage release of anion in the range of 90.0 %-
97.5 % compared to chitosan and cellulose acetate coated nanocomposite with the range
of 77.6 %-87.9 % and 49.1 %-90.0 %, respectively. The results for kinetics study showed
that ZLH-SDS-ISO and ZLH-SDS-THI were governed by first order in phosphate solution, meanwhile the
release in sulphate and chloride solutions followed the pseudo second order. Whereby,
ZLH-SDS-PRO best fitted with pseudo second order in all solutions. All cellulose acetate
coated nanocomposites were governed by pseudo second order in all solutions. Chitosan coated
ZLH-SDS-ISO (sulphate and chloride) and ZLH-SDS-THI (all solutions) nanocomposites showed best
fitted with parabolic, whereas for ZLH-SDS-PRO nanocomposite was best fitted with pseudo
second order in all solutions. In conclusion, the nanocomposites were successfully
synthesized and the release time for coated nanocomposite was prolonged compared to uncoated
nanocomposite. The implication of this research is to improve the cultivation activity by
lowering the contamination risk of pesticides in environment.
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