Sugarcane bagasse derived phosphorylated cellulose as substrates for potassium release induced by phosphates surface and drying methods
Abstract
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.
Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.