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Abstract
Zn/Al-layered double hydroxide-quinclorac (Zn/Al-LDH-QC) nanocomposite has been synthesised via co-precipitation method. The versatility of the Zn/Al-LDH enables this host material to be intercalated with quinclorac (QC), a type of auxin agonist herbicide that was widely used in paddy cultivation. The PXRD analysis shows that the basal spacing of the Zn/Al-LDH-QC nanocomposite expanded in the range of 15.8–16.7 Å (from 8.8 Å in Zn/Al-LDH), therefore indicating the successful intercalation of QC into the interlayer gallery of Zn/Al-LDH. The intercalation was also proven from the FTIR and elemental analysis. The thermogravimetric analysis conducted using TGA/DTG shows that the Zn/Al-LDH-QC exhibits better thermal stability compared to the pure QC herbicide. Based on the results collected from the ICP-OES, CHNS analyser, and TGA/DTG, the chemical formula of Zn/Al-LDH-QC was proposed as [Zn0.75Al0.25(OH)2][C9H4Cl2NCOO]− 0.250.90H2O. This study shows that the Zn/Al-LDH has potential to be used as a host material for herbicide in paddy cultivation sector.
Acknowledgement
The author wishes to thank UPSI and Ministry of Education Malaysia for supporting this research.
Notes
* This research showed that the quinclorac (QC) can be intercalated into the interlayer gallery of Zn/Al-layered double hydroxide via co-precipitation method. This method is the simplest and economical method which uses Zn(NO3)2, Al(NO3)3 and QC as a precursor. The resulting nanocomposite exhibit pure phase and high crystilinity with an improved thermal stability compared to the pure form of QC.