Laboratory-scale studies were aimed at elucidating the physico-chemical aspects on the removal process of crystal violet (CV) from waters and solid substrates. The laponite clay (RD) and sand were chosen for the double aim at investigating them as CV adsorbents for water treatment and as substrates which mime the soil components. Sand is very effective in removing CV from waters. The cyclodextrins (CDs) were exploited as solubility-enhancement agents to remove CV from the solid substrates. They are powerful solvent media because they extract the CV from sand forming water-soluble CV/CD inclusion complexes and do not show affinity for sand. Optimum performance was shown by the modified CDs (i.e. hydroxypropyl-b-cyclodextrin and methyl-b-cyclodextrin). A linear correlation between the logarithm of the equilibrium constant for the CV/CD inclusion complexes formation (K cpx ) and the maximum amount of CV extracted from sand in the columns experiments at a flow rate of 1.5 ml min-1 was drawn. This relationship predicts that CDs with K cpx < 180 M-1 are not suitable for CV removal from sand. CDs failed to displace CV from RD because they generate the formation of RD clusters where CV remains entrapped.

DE LISI R, LAZZARA G, MILIOTO S, MURATORE N (2007). Adsorption of a dye on clay and sand. Use of cyclodextrins as solubility-enhancement agents. CHEMOSPHERE, 69, 1703-1712 [10.1016/j.chemosphere.2007.06.008].

Adsorption of a dye on clay and sand. Use of cyclodextrins as solubility-enhancement agents

DE LISI, Rosario
Membro del Collaboration Group
;
LAZZARA, Giuseppe
Membro del Collaboration Group
;
MILIOTO, Stefana
Membro del Collaboration Group
;
MURATORE, Nicola
Membro del Collaboration Group
2007-01-01

Abstract

Laboratory-scale studies were aimed at elucidating the physico-chemical aspects on the removal process of crystal violet (CV) from waters and solid substrates. The laponite clay (RD) and sand were chosen for the double aim at investigating them as CV adsorbents for water treatment and as substrates which mime the soil components. Sand is very effective in removing CV from waters. The cyclodextrins (CDs) were exploited as solubility-enhancement agents to remove CV from the solid substrates. They are powerful solvent media because they extract the CV from sand forming water-soluble CV/CD inclusion complexes and do not show affinity for sand. Optimum performance was shown by the modified CDs (i.e. hydroxypropyl-b-cyclodextrin and methyl-b-cyclodextrin). A linear correlation between the logarithm of the equilibrium constant for the CV/CD inclusion complexes formation (K cpx ) and the maximum amount of CV extracted from sand in the columns experiments at a flow rate of 1.5 ml min-1 was drawn. This relationship predicts that CDs with K cpx < 180 M-1 are not suitable for CV removal from sand. CDs failed to displace CV from RD because they generate the formation of RD clusters where CV remains entrapped.
2007
Settore CHIM/02 - Chimica Fisica
DE LISI R, LAZZARA G, MILIOTO S, MURATORE N (2007). Adsorption of a dye on clay and sand. Use of cyclodextrins as solubility-enhancement agents. CHEMOSPHERE, 69, 1703-1712 [10.1016/j.chemosphere.2007.06.008].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/18082
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