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Type :thesis
Subject :SB Plant culture
Main Author :Sharifah Norain Mohd Sharif
Title :Controlled release formulation of paddy pesticides intercalated layered metal hydroxide via polysaccharide encapsulation
Place of Production :Tanjong Malim
Publisher :Fakulti Sains dan Matematik
Year of Publication :2019
Corporate Name :Universiti Pendidikan Sultan Idris
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Abstract : Universiti Pendidikan Sultan Idris
This research aimed to synthesis intercalated nanocomposites of paddy pesticides for controlled release formulation (CRF), namely zinc/aluminium–layered double hydroxide–quinclorac (Zn/Al–LDH–QC), zinc hydroxide nitrate–sodium dodecylsulphate–bispyribac (ZHN–SDS–BP) and zinc hydroxide nitrate–sodium dodecylsulphate–imidacloprid (ZHN–SDS–IC) using coprecipitation method. Surface modification of the nanocomposites, were then performed using carboxymethyl cellulose (CMC) and chitosan coatings. The physicochemical properties, CRF and kinetic behaviour were monitored using powder X–ray diffraction (PXRD), thermogravimetric analysis, Fourier transform infrared spectroscopy (FTIR), elemental analysis, field emission scanning electron microscopy (FESEM), gas sorption analysis and ultraviolet–visible spectrometer. The appearance of intercalation peaks at lower 2θ angle in the PXRD pattern, 15.8–16.7 ? (Zn/Al–LDH–QC), 28.2–28.6 ? (ZHN–SDS– BP) and 32.0–32.2 ? (ZHN–SDS–IC) confirmed the intercalation of pesticides in the nanocomposite, which also supported by FTIR and elemental analysis. All coated nanocomposites showed better performance in releasing pesticides, with prolong release time ranging from 2465–6083 min, compared to 1478–4117 min for the uncoated nanocomposites. Releasing of quinclorac and imidacloprid were governed by pseudo second order kinetic model, whereby the bispyribac was governed by pseudo second order and parabolic diffusion kinetic models. In conclusion, the nanocomposites of paddy pesticides for CRF were successfully synthesised. The CMC and chitosan coatings obviously enhance the release behaviour of the pesticides from the nanocomposites. These synthesised nanocomposites are hopefully beneficial in overcoming the excessive usage of pesticide in paddy cultivation.


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