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TCE adsorption by GAC preloaded with humic substances
Author(s) -
Kilduff James E.,
Karanfil Tanju,
Weber Walter J.
Publication year - 1998
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1998.tb08436.x
Subject(s) - adsorption , humic acid , chemistry , trichloroethylene , carbon fibers , polystyrene sulfonate , activated carbon , sulfonate , polystyrene , chemical engineering , organic chemistry , chromatography , sodium , materials science , polymer , fertilizer , pedot:pss , composite number , engineering , composite material
Molecular weight makes a difference—lower‐molecular‐weight substances reduce TCE adsorption. Adsorption of trichloroethylene (TCE) by activated carbon preloaded with humic and fulvic acids was studied under several conditions in completely mixed batch systems. The authors investigated how molecular weight and molecular‐weight distribution of preloaded humic substances affected subsequent adsorption of TCE. The capacity of carbon to adsorb TCE was most greatly reduced in carbon that was preloaded with humic acid components having molecular weights less than about 1,400 g/mol as polystyrene sulfonate. The adsorption capacity was greatly reduced in carbon that was preloaded with whole humic mixtures in which lower molecular weights predominated. The energy distributions of adsorbent indicate that preloaded compounds preferentially occupy high‐energy sites, making them inaccessible to subsequently encountered TCE.