In this work, charcoal-type adsorbents were prepared from black liquor, a cellulose and paper industry residue rich in lignin and containing inorganic salts. During the preparation of adsorbent materials, black liquor was dried at 120 °C and then pyrolyzed at different temperatures (600 °C, 700 °C, and 800 °C) under a nitrogen atmosphere. The samples were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), measurement of specific surface area (BET), point of zero charges (PZC) determination, and evaluating of removal capacity of methylene blue dye. DRX results indicated the presence of crystalline phases of different salts, mainly sodium carbonate, on the surface of the produced carbonaceous materials from black liquor waste. Besides, a significant effect of the pyrolysis temperature on the charcoal crystallinity was observed. Materials presented low values of porosity and specific surface area, and similar morphologies. Solids' surface character was predominantly alkaline, according to PZC curves. All solids were efficient in removing 70 to 85% of the methylene blue's color.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.