Melamine-based organoclay to sequester atrazine.
Sequestration of aqueous atrazine by organoclays prepared from the surfactant 6-piperazin-1-yl-N,N'-bis-(1,1,3,3-tetramethyl-butyl)-(1,3,5)triazine-2,4-diamine and Gonzales bentonite was assessed using 14C-labeled atrazine. Organoclays with varying ratios of surfactant to clay were evaluated with respect to their ability to sequester atrazine from an aqueous solution. Organoclays containing 100-200 g kg-1 surfactant on a total weight basis provided the most efficient adsorption of atrazine, with apparent KOC values exceeding 5000 l kg-1 at these loading fractions. Less than 12% of sequestered atrazine was released during four sequential day long washings, supporting our expectation that the majority of the reaction of atrazine with the surfactant lead to irreversible chemical bond formation through nucleophilic aromatic substitution.
Neitsch
Susan L
SL
Department of Soil and Crop Sciences, Heep Center, 370 Olsen Boulevard, Texas A&M University, College Station, TX 77843, United States.
McInnes
Kevin J
KJ
Senseman
Scott A
SA
White
G Norman
GN
Simanek
Eric E
EE
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D001280:Atrazine / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry*; D001673:Biodegradation, Environmental; D000077215:Clay; D006841:Hydrocarbons, Aromatic / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*; D013997:Time Factors; D014227:Triazines / Q000737:chemistry*
D000538:Aluminum Silicates; D006841:Hydrocarbons, Aromatic; D013501:Surface-Active Agents; D014227:Triazines; D001546:Bentonite; C011907:melamine; D001280:Atrazine; D000077215:Clay