A clay–vesicle system for water purification from organic pollutants

Abstract

Vesicle-clay complexes in which positively charged vesicles composed of didodecyldimethylammonium bromide (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 10mg/L of it. 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 1L (25 pore volumes) of a solution including all the pollutants at 10mg/L each, removal was complete for sulfentrazone and imazaquin, 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.

What happens when pharmaceuticals meet colloids

“…Their results indicated that 87-99 % of the pollutants were removed from aqueous phase. Similar results were also obtained by Undabeytia et al (2008). Furthermore, Polubesova et al (2006) used micelles of BDMHDA preadsorbed on montmorillonite to remove TC and sulfonamide antibiotics from water and found that the micelle-clay complexes (1 % w/w) removed 96-99.9 % of antibiotics from their water solutions.…”

Removal and degradation of β-lactam antibiotics in water using didodecyldimethylammonium bromide-modified montmorillonite organoclay

“…This scale was selected for easy handling of the solution, rapid separation of organoclay, and rapid temperature setting which were essential to obtain informative results with minimizing experimental errors. formation and structures of organoclays [18,19,22]. The modification with DDAB was also confirmed based on a broad absorbance (νN-H: ~3400 cm -1 ) and sharp peaks (νC-H:…”

“…The organoclay can be readily prepared by mixing appropriate surfactants and clay minerals in the aqueous media [17][18][19]. Hydrophobic organic pollutants in water are incorporated into surfactant aggregates formed between the layers of clay minerals [17][18][19][20][21][22].…”

“…The organoclay can be readily prepared by mixing appropriate surfactants and clay minerals in the aqueous media [17][18][19]. Hydrophobic organic pollutants in water are incorporated into surfactant aggregates formed between the layers of clay minerals [17][18][19][20][21][22]. Rather polar and ionizable compounds such as phenols, pesticides, and pharmaceuticals can also sorb on the organoclay [23][24][25][26][27][28][29][30][31][32][33][34].…”

The Modified Bentonite Performance in Adsorption Process of Organic and Inorganic Contaminants from Aqueous Phase

“…The Surface Science Society of Japan (http://www.sssj.org/ejssnt)chains without specific functional groups [17][18][19][20][21][22].…”