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Adsorption of Humic Substances in the Presence of Sodium Salts
Author(s) -
Lafrance Pierre,
Mazet Michel
Publication year - 1989
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.1551-8833.1989.tb03194.x
Subject(s) - chemistry , zeta potential , adsorption , salt (chemistry) , inorganic chemistry , humic acid , sodium , carbon fibers , surface charge , ionic strength , sodium salt , organic chemistry , chemical engineering , aqueous solution , fertilizer , materials science , composite number , nanoparticle , engineering , composite material
Inorganic sodium salts were found to enhance the adsorptive capacity of activated carbon for humic substances. The interactions between the salts and the surface of the carbon were investigated as a function of salt type and concentration by zeta potential measurements. At a constant pH, increasing the concentration of humic substances markedly increased the magnitude of the negative value of the zeta potential, whereas increasing salt concentration neutralized the zeta potential. The anion of the salts had little effect on adsorptive capacity or on the change in the zeta potential. Sodium ion concentration is thus the primary factor responsible for the increased adsorption of humic substances, probably via the neutralization of negative charges on both humate molecules and carbon surface functional groups.