Sharifah Norain Mohd Sharif, Norhayati Hashim, Illyas Md Isa, Suriani Abu Bakar, Mohamad Idris Saidin, Mohamad Syahrizal Ahmad, Mazidah Mamat, Mohd Zobir Hussein, Rahadian Zainul
Imidacloprid (IC) is a neutral charge insecticide that is commonly used in paddy cultivation areas to kill invasive insects. However, the uncontrolled usage of IC may cause serious problems for non-target organisms and the environment. This work focusses on the potential of using chitosan to develop an efficient insecticide that could minimise the environmental risk by controlling the release of IC into the environment. The powder X-ray diffraction (PXRD) and Fourier transform infrared (FTIR) analysis of the chitosan coated zinc hydroxide nitrate-sodium dodecylsulphate-imidacloprid (ZHN-SDS-IC-Chi) nanocomposite confirmed that the chitosan coating process did not interfere with the types of ions that were intercalated in the interlayer gallery of the nanocomposite. The release study performed in aqueous solutions of Na3PO4, Na2SO4and NaCl revealed that the slowest release was observed when using NaCl as the release media. The release of IC was governed by the pseudo second order kinetic model, which described the release mechanism of the IC as beingviadissolution and ion exchange. Even though the overall findings showed that the physicochemical properties of the ZHN-SDS-IC and ZHN-SDS-IC-Chi were not too different, the presence of chitosan was found to be beneficial for prolonging the release process. The synthesised ZHN-SDS-IC-Chi nanocomposite will hopefully be used as a safer insecticide in paddy cultivation and will fulfil both economic and ecological demands. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2020.
Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim, 35900, Perak, Malaysia; Nanotechnology Research Centre, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim, 35900, Perak, Malaysia; Department of Physics, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim, 35900, Perak, Malaysia; School of Fundamental Science, Universiti Malaysia Terengganu, Kuala Terengganu, 21030, Terengganu, Malaysia; Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, Serdang, 43400, Selangor, Malaysia; Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Padang, West Sumatera, 25171, Indonesia
