Sorption and desorption behavior of chloroanilines and chlorophenols on montmorillonite and kaolinite

Stefano Polati, Fabio Gosetti, Valentina Gianotti, Maria Carla Gennaro

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The bioavailability of pollutants, pesticides and/or their degradation products in soil depends on the strength of their sorption by the different soil components, particularly by the clay minerals. This study reports the sorption-desorption behavior of the environmentally hazardous industrial pollutants and certain pesticides degradation products, 3-chloroaniline, 3,4-dichloroaniline, 2,4,6-trichloroaniline, 4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol on the reference clays kaolinite KGa-1 and Na-montmorillonite SWy-l. In batch studies, 2.0 g of clay were equilibrated with 100.0 mL solutions of each chemical at concentrations ranging from 10.0 to 200.0 mg/L. The uptake of the compounds was deduced from the results of HPLC-UV-Vis analysis. The lipophilic species were best retained by both clay materials. The most lipophilic chemical used in the study, 2,4,6- trichloroaniline, was also the most strongly retained, with sorption of up to 8 mg/g. In desorption experiments, which also relied on HPLC-UV-Vis technique, 2,4,6-trichloroaniline was the least desorbed from montmorillonite. However, on kaolinite all of the compounds under study were irreversibly retained. The experimental data have been modelled according to the Langmuir and Freundlich isotherms. A hypothesis is proposed concerning the sorption mechanism and potential applications of the findings in remediation strategies have been suggested.

Lingua originaleInglese
pagine (da-a)765-779
Numero di pagine15
RivistaJournal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes
Volume41
Numero di pubblicazione6
DOI
Stato di pubblicazionePubblicato - 1 set 2006

Fingerprint

Entra nei temi di ricerca di 'Sorption and desorption behavior of chloroanilines and chlorophenols on montmorillonite and kaolinite'. Insieme formano una fingerprint unica.

Cita questo