Water purification from organic pollutants by optimized micelle-clay systems.
Removal of anionic pollutants (imazaquin, sulfentrazone, sulfosulfuron) and neutral pollutants (alachlor, acetochlor, chlorotoluron, bromacil) from water by micelles preadsorbed on montmorillonite was studied. Micelles of octadecyltrimethylammonium and benzyldimethylhexadecylammonium (BDMHDA) were used. The micelle-clay systems (1% w/w) removed 87-99% of the pollutants from their water solutions containing 1-33 mg/L of herbicide. The nature of the headgroup of the organic cation, which forms the micelles, is critical. Desorption of imazaquin and acetochlor from 0.3% (w/w) suspension of BDMHDA-clay complex after 24 h was around 7% in the range of adsorbed amounts from 0.6 to 15.3 mg/g. These results indicate rather slow rates and small extents of release of pollutants from micelle-clay complexes. Column filters (25 cm) made of a mixture of quartz sand and BDMHDA micelle-clay complex at 100:1 w/w ratio removed at least 99% of above pollutants from initial solutions containing 10 mg/L; 99.5 and 97% of sulfosulfuron and alachlor were removed from their initial solutions containing 200 and 5 microg/L, respectively. These data indicate that micelle-clay complexes are very efficient for water purification from organic contaminants.
Polubesova
Tamara
T
Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel. polubeso@agri.huji.ac.il
Nir
Shlomo
S
Zadaka
Dikla
D
Rabinovitz
Onn
O
Serban
Carina
C
Groisman
Ludmila
L
Rubin
Baruch
B
D001546:Bentonite / Q000737:chemistry*; D001548:Benzalkonium Compounds; D001681:Biological Assay; D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000737:chemistry* / Q000633:toxicity; D007093:Imidazoles / Q000737:chemistry; D008823:Micelles; D011743:Pyrimidines / Q000737:chemistry / Q000633:toxicity; D011791:Quartz; D011804:Quinolines / Q000737:chemistry; D045868:Sorghum / Q000187:drug effects / Q000254:growth & development; D013449:Sulfonamides / Q000737:chemistry / Q000633:toxicity; D013501:Surface-Active Agents / Q000737:chemistry*; D014052:Toluidines / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000633:toxicity; D018508:Water Purification / Q000379:methods*
D001548:Benzalkonium Compounds; D006540:Herbicides; D007093:Imidazoles; D008823:Micelles; D011743:Pyrimidines; D011804:Quinolines; D013449:Sulfonamides; D013501:Surface-Active Agents; D014052:Toluidines; D014874:Water Pollutants, Chemical; D001546:Bentonite; D011791:Quartz; C043377:acetochlor; C057728:imazaquin; C015163:dimethyldodecylbenzylammonium; C439268:sulfosulfuron