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Sugarcane Bagasse Fibers Derivatives and Their Application in Chitosan-Based Composite Films for NPK Fertilizer Release

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Autor(es):
Messa, Lucas Luiz ; Contieri, Gabriela Aparecida ; Faez, Roselena
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: Journal of the Brazilian Chemical Society; v. N/A, p. 11-pg., 2022-10-27.
Resumo

Encapsulation and release of NPK fertilizer by composite films were systematically demonstrated by casting dispersions of chitosan (CS) and sugarcane bagasse (SCB) derivatives (holocellulose (HC), cellulignin (CL), and cellulose (CEL)) fibers under varied CS-to-NPK and CS-to-SCB derivatives mass ratios. SCB derivatives were obtained from sugarcane bagasse as agricultural waste by following the alkali dissolution (4% NaOH, 70 degrees C for 5 min), sodium chlorite delignification (1.4% NaClO2, pH 3.5, 70 degrees C, 5 h), or from a combination of both. Nutrient adsorption capacity can be tunable by the chemical composition of SCB derivatives, i.e., fibers with noncellulosics exhibited higher adsorption capacities while the absence of noncellulosics lessened their adsorption capacity. Oven-drying (60 degrees C, 5 h) of optimal 1:0.5 CS/NPK film-forming solution produced highly uniform films with shape with 0.31 +/- 0.02 mm thickness while increasing fiber content in the solution to 25 or 50% prevents films retraction effect. The release of highly watersoluble NPK fertilizer from these composite films was lower with hemicelluloses (52-82%) or lignin (55-92%) contents in SCB fiber than in noncellulosics absence (71-100%), thus could be tuned by varying the chemical composition SCB derivative, followed by a quasi-Fickian diffusion mechanism in water. (AU)

Processo FAPESP: 19/02535-5 - Estruturas poliméricas como matrizes hospedeiras para nutrientes de liberação programada: fertilizantes ambientalmente amigáveis
Beneficiário:Roselena Faez
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 19/08057-8 - Biocompósitos ferti-liberadores à base de quitosana e celulose obtidos pela técnica spray drying
Beneficiário:Lucas Luiz Messa
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
Processo FAPESP: 17/03980-7 - Biocompósitos ferti-liberadores à base de quitosana e celulose obtidos pela técnica spray drying
Beneficiário:Lucas Luiz Messa
Modalidade de apoio: Bolsas no Brasil - Doutorado Direto