Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFS |
Texto Completo: | https://ri.ufs.br/jspui/handle/Ir01405a/15677 |
Resumo: | In this study, a new series of superabsorbent hydrogels composed of polyacrylamide (pAAm), cellulose acetate (CA), and montmorillonite (MMT) suitable for slow release of fertilizers were synthesized and their synergistic effects were evaluated through sorption and desorption studies of nitrogen fertilizer, urea (CO(NH2)2). The results for the degree of swelling show a 60% increase in weight at pH 6.0 when varying from 5 to 10% of MMT in the hydrogel composition. The presence of montmorillonite and cellulose acetate in the hydrogel caused the system to release the nutrient in a more controlled manner than with the pure hydrogel. Soil water retention showed that the synthesized hydrogels retain up to 39% more water when compared to soil without hydrogel and release in times of up to 30 days. The hydrogels showed a low percentage of applied nitrogen recovery (about 42% less than the treatment with urea), demonstrating the efficiency in reducing nitrogen leaching losses. The measures of urea release in the soil (25%, 75% and 89% in 5, 20 and 30 days), presented by the hydrogel "C" (pAAm/10% MMT/10% CA) were gradual and indicated a slow release behavior. When applied to the lettuce crop, it was found that it favored improvements in all variables studied when compared to the control. In conclusion, excellent results were obtained for the controlled desorption of urea, highlighting the hydrolyzed hydrogels containing 10% montmorillonite and 10% cellulose acetate. The total nutrient values show that this material is potentially viable for application in agriculture. |
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Macedo, Osmir Fabiano Lopes deRomão, Luciane Pimenta CruzCunha, Graziele Costa2022-05-10T00:02:59Z2022-05-10T00:02:59Z2022-01-20MACEDO, Osmir Fabiano Lopes de. Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes. 2022. 102 f. Tese (Doutorado em Química) - Universidade Federal de Sergipe, São Cristóvão, 2022.https://ri.ufs.br/jspui/handle/Ir01405a/15677In this study, a new series of superabsorbent hydrogels composed of polyacrylamide (pAAm), cellulose acetate (CA), and montmorillonite (MMT) suitable for slow release of fertilizers were synthesized and their synergistic effects were evaluated through sorption and desorption studies of nitrogen fertilizer, urea (CO(NH2)2). The results for the degree of swelling show a 60% increase in weight at pH 6.0 when varying from 5 to 10% of MMT in the hydrogel composition. The presence of montmorillonite and cellulose acetate in the hydrogel caused the system to release the nutrient in a more controlled manner than with the pure hydrogel. Soil water retention showed that the synthesized hydrogels retain up to 39% more water when compared to soil without hydrogel and release in times of up to 30 days. The hydrogels showed a low percentage of applied nitrogen recovery (about 42% less than the treatment with urea), demonstrating the efficiency in reducing nitrogen leaching losses. The measures of urea release in the soil (25%, 75% and 89% in 5, 20 and 30 days), presented by the hydrogel "C" (pAAm/10% MMT/10% CA) were gradual and indicated a slow release behavior. When applied to the lettuce crop, it was found that it favored improvements in all variables studied when compared to the control. In conclusion, excellent results were obtained for the controlled desorption of urea, highlighting the hydrolyzed hydrogels containing 10% montmorillonite and 10% cellulose acetate. The total nutrient values show that this material is potentially viable for application in agriculture.Neste estudo, uma nova série de hidrogéis superabsorventes compostos por poliacrilamida (pAAm), acetato de celulose (AC) e montmorilonita (MMT) adequados para liberação lenta de fertilizantes foi sintetizada e seus efeitos sinérgicos foram avaliados através de estudos de sorção e dessorção de um fertilizante nitrogenado, a ureia (CO(NH2)2). Os resultados para o grau de intumescimento mostram um aumento, em peso, de 60% em pH 6,0 quando variou-se de 5 para 10% de MMT na composição do hidrogel. A presença da montmorilonita e acetato de celulose no hidrogel fez com que o sistema liberasse o nutriente de forma mais controlada do que com o hidrogel puro. A retenção de água no solo mostrou que os hidrogéis sintetizados retêm até 39% a mais de água quando comparado ao solo sem hidrogel e liberam em tempos de até 30 dias. Os hidrogéis apresentaram baixo percentual de recuperação do nitrogênio aplicado (cerca de 42% menos que o tratamento com uréia), demonstrando a eficiência na redução das perdas por lixiviação de nitrogênio. As medidas de liberação de ureia no solo (25%, 75% e 89% em 5, 20 e 30 dias), pelo hidrogel “C” (pAAm / 10% de MMT / 10% de CA) foram graduais e indicaram um comportamento de liberação lenta. Quando aplicado à cultura da alface, verificou-se melhorias em todas as variáveis estudadas quando comparadas ao controle. Excelentes resultados foram obtidos para a dessorção controlada de uréia, com destaque para os hidrogéis hidrolisados contendo 10% de montmorilonita e 10% de acetato de celulose. Os valores totais de nutrientes mostram que este material é potencialmente viável para aplicação na agricultura.São CristóvãoporQuímicaPoliacrilámidaAcetato de celuloseFertilizantes nitrogenadosHidrogéis superabsorventesPoliacrilamidaMontmorilonitaAcetato de celuloseLiberação lenta de fertilizanteSuperabsorbent hydrogelsPolyacrylamideMontmorillonite clayCellulose acetateSlow fertilizer releaseCIENCIAS EXATAS E DA TERRA::QUIMICASíntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantesSynthesis, characterization and evaluation of copolymerized superabsorvent hydrogels employed in the slow release of fertilizersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisPós-Graduação em QuímicaUniversidade Federal de Sergipereponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessTEXTOSMIR_FABIANO_LOPES_MACEDO.pdf.txtOSMIR_FABIANO_LOPES_MACEDO.pdf.txtExtracted texttext/plain132240https://ri.ufs.br/jspui/bitstream/Ir01405a/15677/3/OSMIR_FABIANO_LOPES_MACEDO.pdf.txtab1b0498adbac34e71fc07fba5462501MD53THUMBNAILOSMIR_FABIANO_LOPES_MACEDO.pdf.jpgOSMIR_FABIANO_LOPES_MACEDO.pdf.jpgGenerated Thumbnailimage/jpeg1643https://ri.ufs.br/jspui/bitstream/Ir01405a/15677/4/OSMIR_FABIANO_LOPES_MACEDO.pdf.jpgc1c82bb759d2609c5b17ffd795c946b1MD54LICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/Ir01405a/15677/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALOSMIR_FABIANO_LOPES_MACEDO.pdfOSMIR_FABIANO_LOPES_MACEDO.pdfapplication/pdf1879247https://ri.ufs.br/jspui/bitstream/Ir01405a/15677/2/OSMIR_FABIANO_LOPES_MACEDO.pdfc6661a7171e103595dd20bfa63bc76caMD52Ir01405a/156772022-05-09 21:02:59.942oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2022-05-10T00:02:59Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes |
dc.title.alternative.eng.fl_str_mv |
Synthesis, characterization and evaluation of copolymerized superabsorvent hydrogels employed in the slow release of fertilizers |
title |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes |
spellingShingle |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes Macedo, Osmir Fabiano Lopes de Química Poliacrilámida Acetato de celulose Fertilizantes nitrogenados Hidrogéis superabsorventes Poliacrilamida Montmorilonita Acetato de celulose Liberação lenta de fertilizante Superabsorbent hydrogels Polyacrylamide Montmorillonite clay Cellulose acetate Slow fertilizer release CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes |
title_full |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes |
title_fullStr |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes |
title_full_unstemmed |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes |
title_sort |
Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes |
author |
Macedo, Osmir Fabiano Lopes de |
author_facet |
Macedo, Osmir Fabiano Lopes de |
author_role |
author |
dc.contributor.author.fl_str_mv |
Macedo, Osmir Fabiano Lopes de |
dc.contributor.advisor1.fl_str_mv |
Romão, Luciane Pimenta Cruz |
dc.contributor.advisor-co1.fl_str_mv |
Cunha, Graziele Costa |
contributor_str_mv |
Romão, Luciane Pimenta Cruz Cunha, Graziele Costa |
dc.subject.por.fl_str_mv |
Química Poliacrilámida Acetato de celulose Fertilizantes nitrogenados Hidrogéis superabsorventes Poliacrilamida Montmorilonita Acetato de celulose Liberação lenta de fertilizante |
topic |
Química Poliacrilámida Acetato de celulose Fertilizantes nitrogenados Hidrogéis superabsorventes Poliacrilamida Montmorilonita Acetato de celulose Liberação lenta de fertilizante Superabsorbent hydrogels Polyacrylamide Montmorillonite clay Cellulose acetate Slow fertilizer release CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Superabsorbent hydrogels Polyacrylamide Montmorillonite clay Cellulose acetate Slow fertilizer release |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
In this study, a new series of superabsorbent hydrogels composed of polyacrylamide (pAAm), cellulose acetate (CA), and montmorillonite (MMT) suitable for slow release of fertilizers were synthesized and their synergistic effects were evaluated through sorption and desorption studies of nitrogen fertilizer, urea (CO(NH2)2). The results for the degree of swelling show a 60% increase in weight at pH 6.0 when varying from 5 to 10% of MMT in the hydrogel composition. The presence of montmorillonite and cellulose acetate in the hydrogel caused the system to release the nutrient in a more controlled manner than with the pure hydrogel. Soil water retention showed that the synthesized hydrogels retain up to 39% more water when compared to soil without hydrogel and release in times of up to 30 days. The hydrogels showed a low percentage of applied nitrogen recovery (about 42% less than the treatment with urea), demonstrating the efficiency in reducing nitrogen leaching losses. The measures of urea release in the soil (25%, 75% and 89% in 5, 20 and 30 days), presented by the hydrogel "C" (pAAm/10% MMT/10% CA) were gradual and indicated a slow release behavior. When applied to the lettuce crop, it was found that it favored improvements in all variables studied when compared to the control. In conclusion, excellent results were obtained for the controlled desorption of urea, highlighting the hydrolyzed hydrogels containing 10% montmorillonite and 10% cellulose acetate. The total nutrient values show that this material is potentially viable for application in agriculture. |
publishDate |
2022 |
dc.date.accessioned.fl_str_mv |
2022-05-10T00:02:59Z |
dc.date.available.fl_str_mv |
2022-05-10T00:02:59Z |
dc.date.issued.fl_str_mv |
2022-01-20 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
MACEDO, Osmir Fabiano Lopes de. Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes. 2022. 102 f. Tese (Doutorado em Química) - Universidade Federal de Sergipe, São Cristóvão, 2022. |
dc.identifier.uri.fl_str_mv |
https://ri.ufs.br/jspui/handle/Ir01405a/15677 |
identifier_str_mv |
MACEDO, Osmir Fabiano Lopes de. Síntese, caracterização e avaliação de hidrogéis superabsorventes copolimerizados empregados na liberação lenta de fertilizantes. 2022. 102 f. Tese (Doutorado em Química) - Universidade Federal de Sergipe, São Cristóvão, 2022. |
url |
https://ri.ufs.br/jspui/handle/Ir01405a/15677 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
dc.publisher.program.fl_str_mv |
Pós-Graduação em Química |
dc.publisher.initials.fl_str_mv |
Universidade Federal de Sergipe |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFS instname:Universidade Federal de Sergipe (UFS) instacron:UFS |
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Universidade Federal de Sergipe (UFS) |
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UFS |
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UFS |
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