A clay-vesicle system for water purification from organic pollutans
2008
Undabeytia López, Tomás | Nir, Shlomo | Sánchez Verdejo, Trinidad | Villaverde Capellán, J. | Maqueda Porras, Celia | Morillo González, Esmeralda | Ministerio de Educación y Ciencia (España)
9 pages, 7 tables, 3 figures, 31 references.
Show more [+] Less [-]Vesicle-clay complexes in which positively charged vesicles composed of didodecyldimethylammonium (DDAB) were adsorbed on montmorillonite removed efficiently anionic (sulfentrazone, imazaquin) and neutral (alachlor, atrazine) pollutants from water. These complexes (0.5% w:w) removed 92-100% of sulfentrazone,imazaquin and alachlor and 60% of atrazine from a solution containing 10 mg/L. A synergistic effect on the adsorption of atrazine was observed when all pollutants were present simultaneously (30 mg/L each), its percentage of removal being 85.5. Column filters (18 cm) filled with a mixture of quartz sand and vesicle-clay (100:1, w:w) were tested. For the passage of 1 L (25 pore volumes) of a solution including all the 11 pollutants at 10 mg/L each, removal was complete for sulfentrazone and imazaquin, 12 94% for alachlor and 53.1% for atrazine, whereas removal was significantly less efficient when using activated carbon. A similar advantage of the vesicle-clay filter was observed for the capacities of removal.
Show more [+] Less [-]The authors acknowledge financial support by the Spanish Ministry of Education and Science (Projects AGL2005-00164 and CTM2006-04626/TECNO).
Show more [+] Less [-]Peer reviewed
Show more [+] Less [-]AGROVOC Keywords
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