Leaching of 2,4-D from a soil in the presence of β-cyclodextrin: laboratory columns experiments

Abstract

This study reports on the effect of the presence of beta-cyclodextrin (beta-CD) on the adsorption and mobility of the pesticide 2,4-dichlorophenoxyacetic acid (2,4-D) through soil columns. The previous application of beta-CD to the soil produced a retarded leaching of 2,4-D through the soil column, due probably to herbicide adsorption on the soil through beta-CD adsorbed. However, the application of beta-CD solution to the soil column where 2,4-D had been previously adsorbed, led to the complete desorption of the herbicide, due to the formation of water-soluble 1:1 inclusion complexes between 2,4-D and beta-CD. Beta-CD can be viewed as a microscopic organic-phase extractant. It can be an advantage to remove from soil pesticides which are able to form inclusion complexes with cyclodextrins, making them possible candidates for use in in situ remediation efforts.

Effects of cyclodextrins, humic substances, and rhamnolipids on the washing of a historically contaminated soil and on the aerobic bioremediation of the resulting effluents

“…1). Similar features were also observed by other authors, who used water solutions of cyclodextrins to recover various organic pollutants from contaminated soils (McCray and Brusseau, 1998;Boving et al, 1999;Sheremata and Hawari, 2000;Morillo et al, 2001;Ko and Yoo, 2003). On the basis of COD data (Table II), HS and RL markedly sorbed to the soil, and this was probably the cause for the nonhomogeneous ecotoxicity results collected by analyzing HS-and RL-washed soil with Collembola and Lepidium sativum test organisms (Fig.…”

“…Furthermore, few efforts have been made to improve its performances and to investigate the possibility of using environmental compatible pollutant-mobilizing agents instead of chemical surfactants. Some biogenic products, such as cyclodextrins (Fava et al, , 2003McCray and Brusseau, 1998;Boving et al, 1999;Reid et al, 2000;Sheremata and Hawari, 2000;Morillo et al, 2001;Ko and Yoo, 2003), dissolved humic substances (Iglesias-Jimenez et al, 1997;Conte et al, 2001;Fava and Piccolo, 2002), and microbial surfactants (Noordman et al, 1998;Rosenberg and Ron, 1999;Christofi and Ivshina, 2002), have been recently found to be promising mobilizing agents for hydrophobic aromatic pollutants in different soils, as they conjugated marked pollutantmobilizing effects to nontoxicity and biodegradability. Thus, the use of these agents in lieu of synthetic surfactants may contribute to improving the environmental compatibility of the washing technology, which combines good pollutant recovery yields with few or no negative impacts on the soil native structure and on the biotreatability of the resulting wastewaters.…”

Potential of activated carbon to recover randomly-methylated-β-cyclodextrin solution from washing water originating from in situ soil flushing

“…Research has been published regarding the enhancement of the water solubility and/or bioavailability of contaminants with CD for a wide range of contaminants such as PCB (Balogh et al, 2007), trichloroethene (Fenyvesi et al, 2010), polycyclic aromatic hydrocarbons (Viglianti et al, 2006;Wang et al, 2005) and pesticides (Morillo et al, 2001;Wong and Bidleman, 2010). In addition, some field trials to test the remediation of chlorinated solvent-contaminated aquifer with cyclodextrin obtained good results (Blanford et al, 2001;Boving et al, 1998;McCray and Brusseau, 1998;Tick et al, 2003).…”

Treatment of mixed contamination in water using cyclodextrin-based materials

“…There is growing interest in the use of cyclodextrins (CDs) for the cleanup of organic and inorganic pollutants in soils, sediment, and groundwater (Cathum et al, 2005;Chatain et al, 2004;Jozefaciuk et al, 2003;Morillo et al 2001;Tick et al, 2003;Villaverde et al, 2005aVillaverde et al, , 2005b. Cyclodextrins are polysaccharides produced from hydrolyzed starch that uses the external enzyme cyclodextrin glucanotransferase.…”