Herbicide/Zn-Al-layered double hydroxide hybrid composite: synthesis and slow/controlled release properties

Herbicide/Zn-Al-layered double hydroxide hybrid composite: synthesis and slow/controlled release... The herbicide glyphosate (GLY) or 2,4-dichlorophenoxyacetic acids (2,4D) was intercalated in the interlayer region of a Zn-Al-layered double hydroxide (LDH) to obtain LDH-GLY or the LDH-2,4D hybrid composite because of its controlled release. Compared to the physically mixed herbicides, the LDH-herbicide hybrid composite displayed slow-release properties in decarbonated distilled water. The release rate of herbicides was found to be dependent on the carbonate and chloride anion concentrations in solution. The time at which 50% of the herbicides were released from the hybrid composite into solution, t 50, ranged from 6.5 to 18.6 h for LDH-GLY and from 10 to 21.5 h for LDH-2,4D. Our results indicate that the application of LDH-GLY or LDH-2,4D hybrid composite to agricultural areas could reduce the maximum 2,4D or GLY contamination and result in the retardation of herbicides leaching through the soil. This study demonstrates the potential applicability of LDHs as supports for the slow release of acid herbicides. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Science and Pollution Research Springer Journals

Herbicide/Zn-Al-layered double hydroxide hybrid composite: synthesis and slow/controlled release properties

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany
Subject
Environment; Environment, general; Environmental Chemistry; Ecotoxicology; Environmental Health; Atmospheric Protection/Air Quality Control/Air Pollution; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution
ISSN
0944-1344
eISSN
1614-7499
D.O.I.
10.1007/s11356-017-9580-6
Publisher site
See Article on Publisher Site

Abstract

The herbicide glyphosate (GLY) or 2,4-dichlorophenoxyacetic acids (2,4D) was intercalated in the interlayer region of a Zn-Al-layered double hydroxide (LDH) to obtain LDH-GLY or the LDH-2,4D hybrid composite because of its controlled release. Compared to the physically mixed herbicides, the LDH-herbicide hybrid composite displayed slow-release properties in decarbonated distilled water. The release rate of herbicides was found to be dependent on the carbonate and chloride anion concentrations in solution. The time at which 50% of the herbicides were released from the hybrid composite into solution, t 50, ranged from 6.5 to 18.6 h for LDH-GLY and from 10 to 21.5 h for LDH-2,4D. Our results indicate that the application of LDH-GLY or LDH-2,4D hybrid composite to agricultural areas could reduce the maximum 2,4D or GLY contamination and result in the retardation of herbicides leaching through the soil. This study demonstrates the potential applicability of LDHs as supports for the slow release of acid herbicides.

Journal

Environmental Science and Pollution ResearchSpringer Journals

Published: Jul 4, 2017

References

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