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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.


TG, DTG, and DSC curves of (a) Kaol, (b) KaolMeOH, (c) AMT-Kaol, and (d) AMT-KaolMeOH.
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f3: TG, DTG, and DSC curves of (a) Kaol, (b) KaolMeOH, (c) AMT-Kaol, and (d) AMT-KaolMeOH.

Mentions: In the TG curve of Kaol (Fig. 3a), the major mass loss at approximately 400 to 600°C (endothermic peak at 507.8°C in the DSC curve) is attributed to dehydroxylation of the structural AlOH groups. Two mass losses are observed in the TG curve of KaolMeOH (Fig. 3b). Because the methoxy groups are stable up to 350°C, the first slow mass loss at approximately 100 to 300°C is attributed to the dehydration of the physically adsorbed water and the interlayer water generated by the condensation between methanol molecules and AlOH groups of kaolinite1217. The second substantial mass loss at approximately 300 to 600°C represents the decomposition of the grafted methoxy groups and the dehydroxylation of 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)

TG, DTG, and DSC curves of (a) Kaol, (b) KaolMeOH, (c) AMT-Kaol, and (d) AMT-KaolMeOH.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: TG, DTG, and DSC curves of (a) Kaol, (b) KaolMeOH, (c) AMT-Kaol, and (d) AMT-KaolMeOH.
Mentions: In the TG curve of Kaol (Fig. 3a), the major mass loss at approximately 400 to 600°C (endothermic peak at 507.8°C in the DSC curve) is attributed to dehydroxylation of the structural AlOH groups. Two mass losses are observed in the TG curve of KaolMeOH (Fig. 3b). Because the methoxy groups are stable up to 350°C, the first slow mass loss at approximately 100 to 300°C is attributed to the dehydration of the physically adsorbed water and the interlayer water generated by the condensation between methanol molecules and AlOH groups of kaolinite1217. The second substantial mass loss at approximately 300 to 600°C represents the decomposition of the grafted methoxy groups and the dehydroxylation of 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.