Sorption of chlorophenols from aqueous solution by granular activated carbon, filter coal, pine and hardwood

Publisher:
Taylor & Francis Ltd.
Publication Type:
Journal Article
Citation:
Environmental Technology, 2012, 33 (16), pp. 1839 - 1846
Issue Date:
2012-01
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Wood and coal, as low-cost sorbents, have been evaluated as an altemative to commercial granular activated carbon (GAC) for chlorophenol removal. Kinetic experiments indicated that :filter coal had a significantly lower rate of uptake ("" I 0% of final uptake was achieved after three hours) than the other sorbents, owing to intra-particle diffusion limitations. The data fitted a pseudo-second-order model. Sorption capacity data showed that GAC had a high sorption capacity (294--467 mg g-l) compared with other sorbents (3.2-7.5 mg g-I). However, wood and coal had a greater sorption capacity per unit sUlface area than GAC. Sorption equilibrium data was best predicted using a Freundlich adsorption model. The sorption capacity for all sorbents was 2-chlorophenol < 4-chlorophenol < 2, 4-dichlorophenol, which correlates well with solute hydrophobicity, although the relative dillerences werc much less for coal than the other sorbents. The results showed that pine, hardwood and filter coal can be used as sorbent materials for the removal of chlorophenol from water; however, kinetic considerations may limit the application of filter coal.
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