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Encapsulated Urea-Kaolinite Nanocomposite for Controlled Release Fertilizer Formulations

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dc.contributor.author Sempeho, Siafu Ibahati
dc.contributor.author Kim, Hee Taik
dc.contributor.author Mubofu, Egid
dc.contributor.author Pogrebnoi, Alexander
dc.contributor.author Shao, Godlisten
dc.contributor.author Hilonga, Askwar
dc.date.accessioned 2019-05-22T07:21:23Z
dc.date.available 2019-05-22T07:21:23Z
dc.date.issued 2015
dc.identifier.uri http://dx.doi.org/10.1155/2015/237397
dc.identifier.uri http://dspace.nm-aist.ac.tz/handle/123456789/137
dc.description Research Article published by Hindawi Publishing Corporation Journal of Chemistry en_US
dc.description.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 14.6nm and 92.5 nm. Theparticle size varied with intercalation ratioswithmethanol 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∘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. en_US
dc.language.iso en_US en_US
dc.publisher Hindawi Publishing Corporation Journal of Chemistry en_US
dc.subject Research Subject Categories::FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING en_US
dc.title Encapsulated Urea-Kaolinite Nanocomposite for Controlled Release Fertilizer Formulations en_US
dc.type Article en_US


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