标题：Lead removal in aqueous solution by activated carbons prepared from Cola edulis shell (Alocace), Pentaclethra macrophylla husk (Mimosaceae) and Aucoumea klaineana sawdust (Burseraceae)
期刊名称：African Journal of Environmental Science and Technology
电子版ISSN：1996-0786
出版年度：2011
卷号：5
期号：3
页码：197-204
DOI：10.5897/AJEST10.248
语种：English
出版社：Academic Journals
摘要：Three activated carbons prepared from vegetable matters of Gabonese biomass are being investigated as adsorbents for the removal of Pb (II) ions from aqueous solutions by means of batch technique. The equilibrium adsorption level was determined to be a function of pH, contact time, temperature and adsorbent dosage. The experimental adsorption data are well applicable to both Freundlich and Langmuir models with the correlation coefficients higher than 0.9. The adsorption process followed the pseudo second order kinetics (R2>0. 9). The enthalpy change [∆H = 41.237 kJ for activated carbon prepared fromCola edulisshell (CAo°), -3.963 kJ/mol for activated carbon prepared fromPentaclethra macrophyllahusk (GAo) and -1.6 kJ/mol for activated carbon prepared fromAucoumea klaineanasawdust (QAo)] implied that the adsorption was endothermic and exothermic for CAo and GAo or QAo, respectively.
