TY - JOUR
T1 - Effects of potassium distributions in carbonizations of bituminous coal
AU - Jibril, Baba
AU - Al-Maamari, Rashid S.
AU - Al-Amri, Issa
PY - 2009/5
Y1 - 2009/5
N2 - The carbonization of coal/KOH mixtures were investigated to identify the influence of potassium distributions on characteristics of the final products. The products were characterized using TGA, BET, TEM and adsorption of lead from its aqueous solutions with initial concentrations of 10-100 ppm. For the activated carbon obtained at 600 °C, the potassium distribution affected both the BET surface areas (661-1994 m2/g) and the meso- and micro-pore volumes ratios (0.48-0.91). There were also evolutions of nanostructures of both straight and curved tubular morphologies as evidenced by TEM micrograph. The samples exhibited different adsorptive capacities when tested in adsorption of lead from aqueous solutions. The adsorption followed second order kinetics and the equilibrium data were better described by empirical Freudlich isotherm model. The amount of lead adsorbed ranges from 4.3 to 47.3 mg/g. Thus, different degrees of potassium effects led to activated carbons with different surface and adsorptive properties.
AB - The carbonization of coal/KOH mixtures were investigated to identify the influence of potassium distributions on characteristics of the final products. The products were characterized using TGA, BET, TEM and adsorption of lead from its aqueous solutions with initial concentrations of 10-100 ppm. For the activated carbon obtained at 600 °C, the potassium distribution affected both the BET surface areas (661-1994 m2/g) and the meso- and micro-pore volumes ratios (0.48-0.91). There were also evolutions of nanostructures of both straight and curved tubular morphologies as evidenced by TEM micrograph. The samples exhibited different adsorptive capacities when tested in adsorption of lead from aqueous solutions. The adsorption followed second order kinetics and the equilibrium data were better described by empirical Freudlich isotherm model. The amount of lead adsorbed ranges from 4.3 to 47.3 mg/g. Thus, different degrees of potassium effects led to activated carbons with different surface and adsorptive properties.
KW - Activated carbon
KW - BET surface area
KW - Chemical activation
KW - Porosity
KW - TEM
KW - TGA
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U2 - 10.1016/j.jaap.2008.10.019
DO - 10.1016/j.jaap.2008.10.019
M3 - Article
AN - SCOPUS:67349092215
SN - 0165-2370
VL - 85
SP - 529
EP - 533
JO - Journal of Analytical and Applied Pyrolysis
JF - Journal of Analytical and Applied Pyrolysis
IS - 1-2
ER -