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Methoxy-modified kaolinite as a novel carrier for high-capacity loading and controlled-release of the herbicide amitrole.

Tan D, Yuan P, Annabi-Bergaya F, Liu D, He H - Sci Rep (2015)

Bottom Line: Due to the diffusional restriction of the intercalated AMT by the lamellar structure of the kaolinite and the strong electrostatic attraction between the intercalated AMT and the kaolinite, a slow release of AMT from the methoxy-modified kaolinite was achieved.These results show that the methoxy-modification is a facile method to make the interlayer space of kaolinite available for hosting other guest molecules.The methoxy-modified kaolinite is a promising candidate for high-capacity loading and controlled-release of other molecules such as drugs, agrochemicals, and biochemicals.

View Article: PubMed Central - PubMed

Affiliation: 1] CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China [2] Key Laboratory of Solid Waste Treatment and the Resource Recycle (SWUST, Ministry of Education), Mianyang 621010, China.

ABSTRACT
Methoxy-modified kaolinite was used as a novel carrier for loading and release of the herbicide 3-amino-1,2,4-triazole, known as amitrole (abbreviated here as AMT). The methoxy modification made the interlayer space of the kaolinite available for AMT intercalation. The AMT loading content in methoxy-modified kaolinite reached up to 20.8 mass% (twice the loading content by unmodified kaolinite). About 48% of this amount is located in the interlayer space. The release profiles of the AMT fit with the modified Korsmeyer-Peppas model. Due to the diffusional restriction of the intercalated AMT by the lamellar structure of the kaolinite and the strong electrostatic attraction between the intercalated AMT and the kaolinite, a slow release of AMT from the methoxy-modified kaolinite was achieved. These results show that the methoxy-modification is a facile method to make the interlayer space of kaolinite available for hosting other guest molecules. The methoxy-modified kaolinite is a promising candidate for high-capacity loading and controlled-release of other molecules such as drugs, agrochemicals, and biochemicals.

No MeSH data available.


release profiles of AMT from clay minerals.
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f4: release profiles of AMT from clay minerals.

Mentions: The release profiles of AMT are presented in Fig. 4. Because of the high water solubility of AMT, pure AMT exhibited a rapid release with a burst effect, with a large amount of AMT (>50%) released over a very short period of time (< 30 min). Compared to the release of pure AMT, the release of AMT from AMT-Kaol was only slightly retarded. This slightly retarded release of AMT is ascribed to the hydrogen bonding between AMT and kaolinite. However, the release of AMT from AMT-KaolMeOH was intensively retarded, and the burst effect of AMT was significantly attenuated. These results suggest that the methoxy modification of kaolinite had a positive effect by slowing the release of AMT from the kaolinite.


Methoxy-modified kaolinite as a novel carrier for high-capacity loading and controlled-release of the herbicide amitrole.

Tan D, Yuan P, Annabi-Bergaya F, Liu D, He H - Sci Rep (2015)

release profiles of AMT from clay minerals.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4352846&req=5

f4: release profiles of AMT from clay minerals.
Mentions: The release profiles of AMT are presented in Fig. 4. Because of the high water solubility of AMT, pure AMT exhibited a rapid release with a burst effect, with a large amount of AMT (>50%) released over a very short period of time (< 30 min). Compared to the release of pure AMT, the release of AMT from AMT-Kaol was only slightly retarded. This slightly retarded release of AMT is ascribed to the hydrogen bonding between AMT and kaolinite. However, the release of AMT from AMT-KaolMeOH was intensively retarded, and the burst effect of AMT was significantly attenuated. These results suggest that the methoxy modification of kaolinite had a positive effect by slowing the release of AMT from the kaolinite.

Bottom Line: Due to the diffusional restriction of the intercalated AMT by the lamellar structure of the kaolinite and the strong electrostatic attraction between the intercalated AMT and the kaolinite, a slow release of AMT from the methoxy-modified kaolinite was achieved.These results show that the methoxy-modification is a facile method to make the interlayer space of kaolinite available for hosting other guest molecules.The methoxy-modified kaolinite is a promising candidate for high-capacity loading and controlled-release of other molecules such as drugs, agrochemicals, and biochemicals.

View Article: PubMed Central - PubMed

Affiliation: 1] CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China [2] Key Laboratory of Solid Waste Treatment and the Resource Recycle (SWUST, Ministry of Education), Mianyang 621010, China.

ABSTRACT
Methoxy-modified kaolinite was used as a novel carrier for loading and release of the herbicide 3-amino-1,2,4-triazole, known as amitrole (abbreviated here as AMT). The methoxy modification made the interlayer space of the kaolinite available for AMT intercalation. The AMT loading content in methoxy-modified kaolinite reached up to 20.8 mass% (twice the loading content by unmodified kaolinite). About 48% of this amount is located in the interlayer space. The release profiles of the AMT fit with the modified Korsmeyer-Peppas model. Due to the diffusional restriction of the intercalated AMT by the lamellar structure of the kaolinite and the strong electrostatic attraction between the intercalated AMT and the kaolinite, a slow release of AMT from the methoxy-modified kaolinite was achieved. These results show that the methoxy-modification is a facile method to make the interlayer space of kaolinite available for hosting other guest molecules. The methoxy-modified kaolinite is a promising candidate for high-capacity loading and controlled-release of other molecules such as drugs, agrochemicals, and biochemicals.

No MeSH data available.