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Nascimento, Victoria X.; Pinto, Diana; Lütke, Sabrina F.; da Silva, Maria C. F.; Machado, Fernando. M.; Lima, Éder. C.; Silva, Luis F. O.; Dotto, Guilherme L.
Environmental science and pollution research international, 04/2023, Volume: 30, Issue: 20Journal Article
Sapelli wood sawdust-derived magnetic activated carbon (SWSMAC) was produced by single-step pyrolysis using KOH and NiCl 2 as activating and magnetization agents. SWSMAC was characterized by several techniques (SEM/EDS, N 2 adsorption/desorption isotherms, FTIR, XRD, VSM, and pH PZC ) and applied in the brilliant blue FCF dye adsorption from an aqueous medium. The obtained SWSMAC was a mesoporous material and showed good textural properties. Metallic nanostructured Ni particles were observed. Also, SWSMAC exhibited ferromagnetic properties. In the adsorption experiments, adequate conditions were an adsorbent dosage of 0.75 g L −1 and a solution pH of 4. The adsorption was fast, and the pseudo-second-order demonstrated greater suitability to the kinetic data. The Sips model fitted the equilibrium data well, and the maximum adsorption capacity predicted by this model was 105.88 mg g −1 (at 55 °C). The thermodynamic study revealed that the adsorption was spontaneous, favorable, and endothermic. Besides, the mechanistic elucidation suggested that electrostatic interactions, hydrogen bonding, π–π interactions, and n–π interactions were involved in the brilliant blue FCF dye adsorption onto SWSMAC. In summary, an advanced adsorbent material was developed from waste by single-step pyrolysis, and this material effectively adsorbs brilliant blue FCF dye.
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