Document Detail


Nanosized silica modified with carboxylic acid as support for controlled release of herbicides.
MedLine Citation:
PMID:  21728319     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Hexagonal mesoporous sílica modified with carboxylic acid (SiAc) has been obtained by reaction between chloroacetic acid and 3-aminopropyltrimetoxysilane, which was immobilized on porous by sol-gel process in the presence of n-dodecylamine template. SiAc was characterized by TG, FT-IR, 29Si-NMR, 13C-NMR, SEM, surface charge density, surface area and porous diameter, which proved that the carboxylic group was chemically bonded to an inorganic structure, and the material presented a nanometric structure with spheres < 50 nm and porous with 10 nm. Herbicides 2,4-D and picloram were anchored on SiAc porous gel to produce the materials named SiD and SiPi, respectively. The controlled release of picloram from the SiAc was less than 2,4-D. After 26 days of releasing, 4.43•10-5 mol L-1 of picloram were delivered by SiPi and 5.0•10-5 L-1 was released from the SiD in 30 days.
Authors:
Alexandre Gustavo Soares Prado; Alecio R Nunes; Aline O Moura
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-5
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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