Sugarcane bagasse, vinasse and a mixture of sugarcane bagasse and vinasse were hydrothermally carbonized (HTC), with and without the addition of phosphoric acid, in order to propose new applications of sucroenergetic industry by-products on soil. Detailed information on the composition and properties of hydrochars has been obtained through elemental composition, thermogravimetric analysis, nuclear magnetic resonance and, ther- mochemolysis GC-MS. The soluble acidic fraction from the hydrochar samples were applied to maize seeds to evaluate the agronomic potential as biostimulants and relate the molecular features with maize seed germina- tion. The HTC treatment converted polysaccharide-based biomasses into hydrochars with hydrophobic charac- teristics (C-Aryl and C-Akyl). Furthermore, the addition of phosphoric acid further increased the overall hydrophobicity and shifted the thermal degradation of the hydrochars to higher temperatures. Biomass influ - enced the hydrochars that formed, in which the molecular features of sugarcane bagasse determined the for- mation of more polar hydrochar, due to the preservation of lignin and phenolic components. Meanwhile, the HTC of vinasse resulted in a more hydrophobic product with an enrichment of condensed and recalcitrant organic fractions. The germination assay showed that polar structures of bagasse may play a role in improving the maize seeds germination rate (increase of ~11%), while the hydrophobic domains showed negative effects. The re- sponses obtained in germination seems to be related to the molecular characteristics that organic extracts can present in solution.
|Titolo:||Hydrochar obtained with by-products from the sugarcane industry: Molecular features and effects of extracts on maize seed germination|
|Data di pubblicazione:||2021|
|Appare nelle tipologie:||1.1.1 Articolo su rivista con DOI|