Title: Hybridisation of chlorophenoxyherbicides with layered double hydroxide for the formation of layered organic-inorganic encapsulated agrochemical nanocomposites

Authors: Siti Halimah Sarijo, Mohd Zobir Hussein, Zulkarnain Zainal

Addresses: Faculty of Applied Science, University Technology MARA, 40450 Shah Alam, Selangor, Malaysia. ' Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. ' Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia

Abstract: Agrochemicals of phenoxyherbicides-type, namely 2-chlorophenoxyacetate (2CPA) and 2,4,5-trichlorophenoxyacetate (TCPA) were encapsulated separately into zinc-aluminium-layered double hydroxide inorganic interlamellae for the formation of new organic-inorganic hybrid nanocomposites materials, N2CPA and NTCPA, respectively. Intercalation of the organic moieties was accomplished by self-assembly method. Well-ordered nanolayered structure of the nanocomposites were obtained at pH 7.5 with Zn to Al molar ratio, R_i = 2 using 0.2 M 2CPA and R_i = 4 with 0.4 M TCPA, respectively. The expansion of basal spacing from 8.9 Å in the layered double hydoxide with nitrate as the counter anion to 18.5 and 26.4 Å in the resulting nanocomposites, N2CPA and NTCPA respectively was observed. Molar ratios of Zn to Al, R for both the as-synthesised nanocomposites are close to their respective initial molar ratio of the mother liquor, R_i with loading percentage of 2CPA and TCPA is 34.8 and 53.3% respectively.

Keywords: agrochemical nanocomposites; phenoxyherbicides; 2-chlorophenoxyacetate; 2,4,5-trichlorophenoxy-acetate; layered double hydroxides; agrochemicals; nanotechnology; plant growth regulators.

DOI: 10.1504/IJNP.2010.035878

International Journal of Nanoparticles, 2010 Vol.3 No.3, pp.229 - 236

Published online: 07 Oct 2010 *

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