Torrefied banana tree fiber pellets having embedded urea for agricultural use
Nenhuma Miniatura disponível
Data
2018-01-01
Autores
Dias, Diogenes S. [UNESP]
Crespi, Marisa S. [UNESP]
Torquato, Lilian D. M. [UNESP]
Kobelnik, Marcelo
Ribeiro, Clovis A. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Banana tree fibers (BF) torrefied in the absence of air and residence time of 60 min at temperatures between 180 and 600 ∘C were evaluated for its agglutination power when converted to pellets. The agglutination power was estimated as aqueous media residence time, being the most resistant pellets the ones obtained from 180 to 300 ∘C. The agglutination power was also evaluated for pellets samples containing from 10 to 90% (w/w) urea. BF torrefied with or without urea have been assessed by thermogravimetry (TG) and differential thermogravimetry (DTG), indicating increased stability on torrefaction temperature and the growth of urea. TG/DTG curves were also used to assess the kinetics of release of urea with time in aqueous by analyzing the residue of biochar BF. Kinetics of release was investigated using a semi-empirical model, known as the power law or the Korsmeyer–Peppas model, Ct/ Cinf= ktn. The value found for n lies between 0.5 and 1.0 indicating that urea release mechanism tends to non-Fickian diffusion or anomalous transport. FTIR spectra showed the weak interaction between urea and biochar.
Descrição
Palavras-chave
Banana tree fibers, Biochar, TG/DTG curves, Torrefaction, Urea fertilizer release
Como citar
Journal of Thermal Analysis and Calorimetry, v. 131, n. 1, p. 705-712, 2018.