Journal of the Brazilian Chemical Societyhttps://www.scielo.br/journal/jbchs/feed/2024-02-23T20:03:52.855000ZVol. 35 No. 11 - 2024WerkzeugA Potential Sustainable Urea-Releasing Device Produced by a Solid-State Reaction10.21577/0103-5053.202400182024-02-23T20:03:52.855000Z2020-08-09T06:48:42.529000ZPellá, Michelly Cristina G.Simão, Andressa RenattaLima, Antônia Millena O.Mauricio, Marcos RobertoPereira, Guilherme M.Silva, Rafael daRubira, Adley F.
<em>Pellá, Michelly Cristina G.</em>;
<em>Simão, Andressa Renatta</em>;
<em>Lima, Antônia Millena O.</em>;
<em>Mauricio, Marcos Roberto</em>;
<em>Pereira, Guilherme M.</em>;
<em>Silva, Rafael Da</em>;
<em>Rubira, Adley F.</em>;
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This work produced chemically activated sugarcane bagasse-based activated carbon (AC) for the controlled release of urea. Fourier transform infrared (FTIR) and Raman analysis confirmed the presence of graphitic structures and multiple oxygen-containing functional groups. After the solid-state reaction that formed the material, their surface area reached 1401 m2 g-1 for the sample prepared with a pyrolysis temperature of 400 °C, a concentration of sodium hydroxide equivalent to 11 mol L-1, and an activation temperature of 900 °C (AC 400-11-900). Zeta potential measures indicated negative charges at pH > 4, reaching almost (–50 mV) at pH 9. The adsorptive capacity of the AC with the highest surface area was equal to (758.7 ± 263.8) mg g-1. Nevertheless, the matrix did not release the urea molecules previously adsorbed into it, which is appealing for fertilizer-releasing purposes because the activated carbon would be able to re-adsorb the non-absorbed urea molecules, sustaining nutrient availability for longer periods.