Controlled release formulation of active agent-zinc layered hydroxide intercalated nanocomposite for pest control
This research aimed to synthesis active agent-zinc layered hydroxide intercalatedagrochemical nanocomposites namely zinc layered hydroxide-sodium dodecylsulphate-isoprocarb (ZLH-SDS-ISO), zinc layered hydroxide-sodium dodecylsulphate-propoxur (ZLH-SDS-PRO) and zinc layered hydroxide-sodium dode...
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| Format: | thesis |
| Language: | eng |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=6754 |
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| Summary: | This research aimed to synthesis active agent-zinc layered hydroxide intercalatedagrochemical nanocomposites namely zinc layered hydroxide-sodium dodecylsulphate-isoprocarb (ZLH-SDS-ISO), zinc layered hydroxide-sodium dodecylsulphate-propoxur (ZLH-SDS-PRO) and zinc layered hydroxide-sodium dodecylsulphate-thiacloprid (ZLH-SDS-THI) using ion exchange method for pest control. Surfacemodification of nanocomposites was performed using chitosan and cellulose acetate. Thenanocomposites were characterized using powder x-ray diffraction (PXRD), Fourier transforminfrared (FTIR), elemental analysis, thermogravimetric and differential thermogravimetricanalysis (TGA/DTG), field emission scanning electron microscope (FESEM), and surface areaanalysis. The results of PXRD patterns showed the basal spacing in the range of 30.1 to 33.1 support the successful intercalation process. FTIR spectra for allnanocomposites showed the presence of anion in the interlayer of the nanocomposite. Release studyshowed 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 rangeof 77.6 %-87.9 % and 49.1 %-90.0 %, respectively. The results for kinetics study showedthat ZLH-SDS-ISO and ZLH-SDS-THI were governed by first order in phosphate solution, meanwhile therelease 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 acetatecoated nanocomposites were governed by pseudo second order in all solutions. Chitosan coatedZLH-SDS-ISO (sulphate and chloride) and ZLH-SDS-THI (all solutions) nanocomposites showed bestfitted with parabolic, whereas for ZLH-SDS-PRO nanocomposite was best fitted with pseudosecond order in all solutions. In conclusion, the nanocomposites were successfullysynthesized and the release time for coated nanocomposite was prolonged compared to uncoatednanocomposite. The implication of this research is to improve the cultivation activity bylowering the contamination risk of pesticides in environment. |
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