Nanocomposite PAAm/methyl cellulose/montmorillonite hydrogel: Evidence of synergistic effects for the slow release of fertilizers

dc.contributor.authorBortolin, Adriel
dc.contributor.authorAouada, Fauze A. [UNESP]
dc.contributor.authorMattoso, Luiz H. C.
dc.contributor.authorRibeiro, Caue
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:30:08Z
dc.date.available2014-05-27T11:30:08Z
dc.date.issued2013-08-07
dc.description.abstractIn this work, we synthesized a novel series of hydrogels composed of polyacrylamide (PAAm), methylcellulose (MC), and calcic montmorillonite (MMt) appropriate for the controlled release of fertilizers, where the components presented a synergistic effect, giving very high fertilizer loading in their structure. The synthesized hydrogel was characterized in relation to morphological, hydrophilic, spectroscopic, structural, thermal, and kinetic properties. After those characterizations, the application potential was verified through sorption and desorption studies of a nitrogenated fertilizer, urea (CO(NH2)2). The swelling degree results showed that the clay loading considerably reduces the water absorption capability; however, the hydrolysis process favored the urea adsorption in the hydrogel nanocomposites, increasing the load content according to the increase of the clay mass. The FTIR spectra indicated that there was incorporation of the clay with the polymeric matrix of the hydrogel and that incorporation increased the water absorption speed (indicated by the kinetic constant k). By an X-ray diffraction technique, good nanodispersion (intercalation) and exfoliation of the clay platelets in the hydrogel matrix were observed. Furthermore, the presence of the montmorillonite in the hydrogel caused the system to liberate the nutrient in a more controlled manner than that with the neat hydrogel in different pH ranges. In conclusion, excellent results were obtained for the controlled desorption of urea, highlighting the hydrolyzed hydrogels containing 50% calcic montmorillonite. This system presented the best desorption results, releasing larger amounts of nutrient and almost 200 times slower than pure urea, i.e., without hydrogel. The total values of nutrients present in the system show that this material is potentially viable for application in agriculture as a nutrient carrier vehicle. © 2013 American Chemical Society.en
dc.description.affiliationDepartamento de Química Universidade Federal de São Carlos, 13565-905, São Carlos, SP
dc.description.affiliationLaboratório Nacional de Nanotecnologia Aplicado Ao Agronegócio (LNNA) Embrapa Instrumentação (CNPDIA), Rua Quinze de Novembro, 1452-Sao Carlos, SP
dc.description.affiliationDepartamento de Física e Química Faculdade de Engenharia de Ilha Solteira Universidade Estadual Paulista-UNESP, 15385-000 Ilha Solteira, SP
dc.description.affiliationEmbrapa Instrumentação (CNPDIA), Rua Quinze de Novembro, 1452-Sao Carlos, SP
dc.description.affiliationUnespDepartamento de Física e Química Faculdade de Engenharia de Ilha Solteira Universidade Estadual Paulista-UNESP, 15385-000 Ilha Solteira, SP
dc.format.extent7431-7439
dc.identifierhttp://dx.doi.org/10.1021/jf401273n
dc.identifier.citationJournal of Agricultural and Food Chemistry, v. 61, n. 31, p. 7431-7439, 2013.
dc.identifier.doi10.1021/jf401273n
dc.identifier.issn0021-8561
dc.identifier.issn1520-5118
dc.identifier.lattes8251270609012225
dc.identifier.scopus2-s2.0-84881255942
dc.identifier.urihttp://hdl.handle.net/11449/76232
dc.identifier.wosWOS:000323020500002
dc.language.isoeng
dc.relation.ispartofJournal of Agricultural and Food Chemistry
dc.relation.ispartofjcr3.412
dc.relation.ispartofsjr1,269
dc.relation.ispartofsjr1,269
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectcontrolled release of fertilizer
dc.subjecthydrogel nanocomposites
dc.subjecthydrolysis process
dc.subjectmontmorillonite clay
dc.subjectpolyacrylamide
dc.subjectAbsorption capability
dc.subjectControlled release
dc.subjectHydrogel nanocomposites
dc.subjectHydrolysis process
dc.subjectMontmorillonite (MMT)
dc.subjectMontmorillonite clay
dc.subjectSorption and desorptions
dc.subjectX-ray diffraction techniques
dc.subjectClay minerals
dc.subjectDesorption
dc.subjectFertilizers
dc.subjectFourier transform infrared spectroscopy
dc.subjectHydrolysis
dc.subjectMetabolism
dc.subjectNanocomposites
dc.subjectNutrients
dc.subjectPolyacrylates
dc.subjectUrea
dc.subjectX ray diffraction
dc.subjectHydrogels
dc.titleNanocomposite PAAm/methyl cellulose/montmorillonite hydrogel: Evidence of synergistic effects for the slow release of fertilizersen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/page/copyright/index.html
unesp.author.lattes8251270609012225
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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