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Encapsulated Urea-Kaolinite Nanocomposite for Controlled Release Fertilizer Formulations

Title
Encapsulated Urea-Kaolinite Nanocomposite for Controlled Release Fertilizer Formulations
Author
김희택
Keywords
INFRARED ABSORPTION SPECTRA; CLAY NANOCOMPOSITES; SPECTROSCOPY; COMPLEXES; METHANOL; WATER; OILS
Issue Date
2015-07
Publisher
HINDAWI PUBLISHING CORPORATION
Citation
JOURNAL OF CHEMISTRY, V. 2015, Article ID 237397
Abstract
Urea controlled release fertilizer (CRF) was prepared via kaolinite intercalation followed by gum arabic encapsulation in an attempt to reduce its severe losses associated with dissolution, hydrolysis, and diffusion. Following the beneficiation, the nonkaolinite fraction decreased from 39.58% to 0.36% whereas the kaolinite fraction increased from 60.42% to 99.64%. The X-ray diffractions showed that kaolinite was a major phase with FCC Bravais crystal lattice with particle sizes ranging between 14.6 nm and 92.5 nm. The particle size varied with intercalation ratios with methanol intercalated kaolinite ˃ DMSO-kaolinite ˃ urea-kaolinite (KPDMU). Following intercalation, SEM analysis revealed a change of order from thick compact overlapping euhedral pseudohexagonal platelets to irregular booklets which later transformed to vermiform morphology and dispersed euhedral pseudohexagonal platelets. Besides, dispersed euhedral pseudohexagonal platelets were seen to coexist with blocky-vermicular booklets. In addition, a unique brain-form agglomeration which transformed into roundish particles mart was observed after encapsulation. The nanocomposites decomposed between 48 and 600 degrees C. Release profiles showed that 100% of urea was released in 97 hours from KPDMU while 87% was released in 150 hours from the encapsulated nanocomposite. The findings established that it is possible to use Pugu kaolinite and gum arabic biopolymer to prepare urea CRF formulations.
URI
https://www.hindawi.com/journals/jchem/2015/237397/abs/http://hdl.handle.net/20.500.11754/36943
ISSN
2090-9063; 2090-9071
DOI
10.1155/2015/237397
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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