PMID: 16519299Mar 8, 2006Paper

Triazine adsorption by saponite and beidellite clay minerals

Environmental Toxicology and Chemistry
Vaneet AggarwalBrian J Teppen

Abstract

We investigated the sorption of three triazine herbicides (atrazine, simazine, and metribuzin) by saponite and beidellite clay minerals saturated with K+, Cs+, Na+, and Ca2+. Saponite clay sorbed a larger fraction of each pesticide from aqueous solution than did beidellite clay. The lower cation-exchange capacity in saponite compared to that in beidellite presumably results in a less crowded interlayer, with more siloxane surface being available for adsorption. Generally, Cs-saturated clays sorbed more triazines than did clays saturated by K+, Na+, or Ca2+. We attribute this to the smaller hydrated radius of Cs+, which again increases the siloxane surface that is available for sorption. Furthermore, the relatively weak hydration of Cs+ reduces the swelling of clay interlayers, thus making sorption domains less hydrated and more receptive to hydrophobic molecules. The Cs-saponite manifested a sorption of more than 1% atrazine by weight above equilibrium concentrations of 6 mg/L, which to our knowledge is the largest sorption of neutral atrazine from water yet reported for an inorganic sorbent. Molecular dynamics simulations indicate that atrazine interacts both with clay basal planes and with multiple cations in the clay interla...Continue Reading

Citations

Apr 12, 2012·Environmental Science & Technology·Erdan HuYuanan Hu
Oct 26, 2011·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·K MüllerJ Etchevers
Feb 9, 2016·Environmental Technology·Serena EspositoFilomena Sannino
Feb 11, 2011·Pest Management Science·Tomás UndabeytiaTrinidad Sánchez-Verdejo
Sep 12, 2015·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Filomena SanninoMichele Pansini
Nov 20, 2016·Journal of Computational Chemistry·Bastien BelzuncesFabienne Bessac
Dec 14, 2016·Environmental Science and Pollution Research International·Matthew EssandohTodd Mlsna
Jun 9, 2021·Journal of Hazardous Materials·Jun WuErdan Hu
Sep 7, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Kyosuke ArakawaShinsuke Takagi
Dec 13, 2006·Environmental Science & Technology·Yu-Hong SuCary T Chiou

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