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UPSI Digital Repository (UDRep)
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| Abstract : Universiti Pendidikan Sultan Idris |
| This research aimed to prepare and study the controlled release of agrochemical herbicide based on new nanocomposites, namely zinc layered hydroxide-3-(4- methoxyphenyl)propionate (ZLH-MPP) and layered double hydroxide-3-(4- methoxyphenyl)propionate (LDH-MPP). This research is divided into three parts which are synthesis of nanocomposites, characterization and controlled release. ZLHMPP nanocomposite was synthesized using direct reaction of an aqueous suspension of zinc oxide with MPP solution. Whereas, LDH-MPP nanocomposite was synthesized using an ion exchange method between nitrate ion and MPP anion. The physiochemical properties of ZLH-MPP and LDH-MPP nanocomposites were characterized using powder x-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), carbon, hydrogen, nitrogen, oxygen and sulphur analysis (CHNO-S), inductive coupled plasma optical emission spectrometry (ICP-OES), thermogravimetric analysis and derivative thermogravimetry (TGA/DTG), and field emission scanning electron microscope (FESEM). Based on the results, PXRD patterns of ZLH-MPP and LDH-MPP nanocomposites showed the expansion of interlayer of layered material with the values of 27.3 Å and in the range of 18.7 Å to 20.5 Å respectively. FTIR spectra for both nanocomposites revealed the presence of MPP in the interlayer of ZLH-MPP and LDH-MPP nanocomposites. The controlled release of MPP from ZLH-MPP and LDH-MPP nanocomposite was found that phosphate solution yielded the highest percentage release compared to sulphate and chloride solutions. The kinetics data for MPP herbicide release from ZLH interlayer were best fitted to the pseudo-second order for phosphate solution and first order for both sulphate and chloride solutions. While, LDH-MPP nanocomposite governed by pseudo second order for all three solutions. The conclusions of this study are, ZLHMPP and LDH-MPP nanocomposites were successfully synthesized and the intercalation was confirmed by characterization data. Besides that, the release behavior of herbicide was also according to one of the models that have been proposed. Implication of this research is to boost the agrochemical activity leading to safer herbicide for environment. |
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