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Contrasting adsorption exhibited by lignite‐based activated carbons
Author(s) -
Allen Stephen J.,
Balasundaram Vikram,
Armenante Piero M.,
Thom Linda,
Kafkewitz David
Publication year - 1995
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280640308
Subject(s) - adsorption , activated carbon , charring , chemistry , freundlich equation , bet theory , langmuir , chemical engineering , carbon fibers , nuclear chemistry , organic chemistry , materials science , composite material , composite number , engineering
The adsorption of sodium benzoate, 2,4‐dichlorophenol and 2,4,6‐trichlorophenol onto five activated carbons made from Northern Ireland lignite is reported. A Two‐stage process consisting of chemical activation during the charring of the lignite, followed by steam activation was used to produce the activated carbons. The adsorption equilibrium isotherms obtained for the carbons have been plotted to obtain the Freundlich, Langmuir and Redlich Peterson constants. Chemical and steam activation methods both produced improvements to the carbon performance on their own, with the combination of the two treatments providing the best results. In the main the chemical treatment providing the best improvement on its own also gave the biggest improvement when combined with steam treatment. BET surface area measurements made using nitrogen adsorption correlate strongly with the capacity for benzoate adsorption.