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Removal of Humic Substances from Water by Means of Calcium‐Ion‐Enriched Natural Zeolites
Author(s) -
Capasso S.,
Colella C.,
Coppola E.,
Iovino P.,
Salvestrini S.
Publication year - 2007
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143006x111772
Subject(s) - humic acid , chemistry , sorption , ionic strength , adsorption , partition coefficient , calcium , salt (chemistry) , sodium , chloride , inorganic chemistry , environmental chemistry , nuclear chemistry , aqueous solution , chromatography , organic chemistry , fertilizer
The ability of the natural zeolited Neapolitan Yellow Tuff (NYT) enriched with calcium ions to remove humic acids from water was evaluated by batch adsorption equilibrium tests and dynamic experiments carried out by percolating humic acid solutions through a small NYT column (breakthrough curves). Under the experimental condition explored, the sorption capacity increases with the ionic strength and has the highest value at pH 7.4. The partition coefficient for a low concentration of humic acid ([humic acid] → 0), at pH 7.4 in 0.01 M sodium chloride, was approximately 1000 L/kg, versus the value of approximately 100 L/kg in the absence of the alkaline metal salt. Therefore, after humic acids have been adsorbed in a column filled with the calcium‐ion‐enriched tuff, a reduction of the salt concentration in the ongoing solution enhances the release of the adsorbed material. These findings show that NYT can be used for the removal of humic acids from water.