Release Properties of Glyphosate from a Supramolecular Glyphosate Intercalated MgAl-LDH

Abstract

Abstract: Glyphosate intercalated magnesium aluminum layered double hydroxides (MgAl-LDH-gly), a novel controlled-releasing herbicide formulation, was synthesized by using a new method involving separate nucleation and aging steps developed in our lab, and characterized by XRD and IR spectroscopy. First of all, the release property of MgAl-LDH-gly was studied in pure H₂O and Na₂CO₃ solution, respectively. Furthermore, its release behavior was studied in phosphate buffer solutions with different pH values and in mixed inorganic anions solution in order to investigate the influence of environmental factors. The results indicate that the release of MgAl-LDH-gly is actually an anions exchange process, and the primitive release process accords with the first-order kinetics equation. It is shown that MgAl-LDH-gly can be used more effectively in weak alkali or neutral environment than in weak acid environment. The quantity of released gly is decided by the whole concentration of inorganic anions in solution in our experimental range.

Key words: Layered double hydroxide, Glyphosate, Controlled-releasing herbicide, Release properties

CLC Number:

O646.2

TrendMD:

ZHANG Xian, ZHANG Hui, WEI Min, Evans D. G., DUAN Xue . Release Properties of Glyphosate from a Supramolecular Glyphosate Intercalated MgAl-LDH[J]. Chem. J. Chinese Universities, 2004, 25(10): 1869.

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