Sugarcane bagasse derived phosphorylated cellulose as substrates for potassium release induced by phosphates surface and drying methods

• Published in: Industrial crops and products Vol. 187; p. 115350
• Main Authors: Messa, Lucas Luiz, Hsieh, You-Lo, Faez, Roselena
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2022
• Subjects: Agricultural residue; Controlled-release fertilizer; Phosphorylation; Agricultural residue; Controlled-release fertilizer; Phosphorylation
• ISSN: 0926-6690; 1872-633X
• DOI: 10.1016/j.indcrop.2022.115350

Encapsulation and controlled release of potassium by phosphorylated cellulose (P-cell) was systematically demonstrated by drying of aqueous P-cell suspensions with potassium chloride (KCl) in varied stoichiometric K+/Cell-O-HPO3- ratios of 1:1, 2:1, and 4:1, and dried into powder-like fibrous fluffs, paper-like films, and three-dimensional porous structures by spray-, oven-, and freeze-drying. Cellulose isolated from sugarcane bagasse as agricultural waste was optimally phosphorylated at 1:0.5:2 anhydroglucose (AHG)/(NH4)2HPO4/CO(NH2)2 as 14.6 µm wide, ca. 366 µm long, highly crystalline (72%) microfibers with 2.4 mmol g−1 charge. Oven drying led to more crystalline (73%) and thermally stable (252.1 °C) films than spray-dried powders (67%, 250.5 °C) and freeze-dried porous bulk (71%, 249.8 °C). The release of highly water-soluble KCl from these three P-cell substrates was highest from the fibrous (90.4–97.3%), three-dimensional porous structure solids (73.5–81.7%), then films (60.4–74.5%), thus could be tuned by varying the anionic/cationic loadings along with drying methods. [Display omitted] •Phosphorylated cellulose fibers were 14.6 µm wide, 366 µm long with 2.4 mmol g−1 charge.•Oven-drying led to more crystalline and thermally stable solids than spray and freeze-drying.•Potassium release was highest from the fibrous, three-dimensional structures, then films.•Release capability was tuned by varying anionic/cationic loadings along with drying methods.