Comparative study on microstructure and surface properties of keratin- and lignocellulosic-based activated carbons

Publication Type:
Journal Article
Citation:
Fuel Processing Technology, 2015, 140 pp. 67 - 75
Issue Date:
2015-12-11
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© 2015 Elsevier B.V. All rights reserved. The paper probed the preparation of activated carbon by potassium silicate (K < inf > 2 < /inf > SiO < inf > 3 < /inf > ) activation from keratin waste (cowhair waste, CW) and lignocellulosic materials (Cyperus alternifolius, CA) and the comparisons of physicochemical properties of the resulting carbons. These impregnation conditions were as follows: one impregnated at room temperature for 12 h then dipped at high temperature for 30 min; the other was only impregnated at room temperature for 12 h, producing four activated carbons CWAC-1, CWAC-2, CAAC-1, and CAAC-2. The influence of activation time, K < inf > 2 < /inf > SiO < inf > 3 < /inf > /precursor weight ratio, and the pre-process on properties of activated carbons was discussed. The CWAC-1 produced at 700°C with the K < inf > 2 < /inf > SiO < inf > 3 < /inf > /precursor weight ratio of 2:1 possessed the Brunauer-Emmet-Teller (BET) surface area of 1965 m < sup > 2 < /sup > /g and total pore volume of 1.345 cm < sup > 3 < /sup > /g, while CAAC-1 prepared at the same conditions attained the BET surface area of 1710 m < sup > 2 < /sup > /g and total pore volume of 0.949 cm < sup > 3 < /sup > /g. The surface area and total pore volume of CAAC increased with the impregnation ratio. Moreover, CWAC-1, CWAC-2, CAAC-1, and CAAC-2 exhibited high portion of micropores, illustrating the role of K < inf > 2 < /inf > SiO < inf > 3 < /inf > . The analysis with a Fourier transform infrared spectrometer indicates that CWAC has more functional groups than CAAC, as well as CWAC-1 and CWAC-2 which possess similar functional groups.
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