Abstract
New insights on KOH-activated carbons prepared from a largely produced waste in Brazil, açaí berry seeds, are reported. Influence of time (120–360 min), temperature (180–540 °C), and dosage of activator (5–10 mols L−1) were analyzed by linear multiple regression and One-Way ANOVA. Seeds and derived AC were characterized by BET, XRD, TGA-DTG, FT-IR, SEM, pH and pHpzc. Possible reaction mechanisms and applicability of the AC are also presented. There was significant prediction of yield of AC (p < 0.0001) by time of carbonization, temperature, and dosage of activator, which together explained 89.1% of the variations in yield. The AC presented SBET of 116.1 m2 g−1, Vpore of 0.043 cm3 g−1, Dp of 3.1 nm, low crystallinity, high thermal resistance, and an amorphous surface rich in mesopores. The pHpzc (6.02) below its basic pH (7.03) shows affinity for anions in remediation or adsorption processes.
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