Activated Carbon from Residual Lignin Used for Color Removal
2022
e Silva, Cláudia Fernanda Lemons | Lemões, Juliana Silva | Romani, Rubia Flores | de Oliveira, William Gonçalves | Leite, Gabriel Feitosa
The objective of this paper was to use residual lignin from second-generation ethanol process in the preparation of activated carbons, which were characterized and evaluated for the discoloration capacity of different dyes. Phosphoric acid and potassium carbonate were used as activating agents. Lignin and the commercial activated carbon were used as a reference, under the experimental conditions studied. Solids were characterized through yield, pH, Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscope/energy dispersive spectroscopy (SEM/EDS). To evaluate the best adsorbent, batch adsorption tests were performed under the same experimental conditions for three different dyes. The activated carbon with H₃PO₄ obtained excellent removal results for methylene blue and methyl red dyes of 96.8 and 94.1%, respectively, besides being the only one to present bromocresol green removal. Lignin proved to be a viable alternative as a raw material for the production of carbonaceous adsorbent, presenting higher yields of activated carbon compared to other raw materials.
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