Nonionic organoclay: A ‘Swiss Army knife’ for the adsorption of organic micro-pollutants?

Régis Guégan (1) , Marcelo Giovanela (2) , Fabienne Warmont (3) , Mikael Motelica-Heino (1)

1 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
2 Centro de Ciências Exatas e Tecnologia
3 CRMD - Centre de Recherche sur la Matière Divisée

A Na exchanged montmorillonite (Mt) was used as a starting layered material for the preparation of two organoclays synthesized with benzyl decyltrimethyl ammonium (BDTA) cationic surfactant and the tri-ethylene glycol mono n-decyl ether(C 10 E 3), a nonconventional nonionic surfactant. The adsorption of the surfactants was performed at an amount of 0.7 times the cation exchange capacity (CEC) for BDTA and below the critical micelle concentration (cmc) where C 10 E 3 is in a monomer state, leading to the intercalation of a lateral monolayer surfactant arrangement within the interlayer space and about 5-7% organic carbon content in organoclays. The environmental properties of both nonionic (C 10 E 3 -Mt) and cationic (BDTA-Mt) organoclays were compared to those of the starting Mt clay with the sorption of three micro-pollutants: benzene, dimethyl-phthalate and paraquat. The adsorption isotherms and the derivative data determined through the fitting procedure by using Langmuir, Freundlich and Dubinin-Radushkevitch equation models explicitly highlighted the importance of the chemical nature of the

Domains: Continental interfaces, environment

Régis Guégan, Marcelo Giovanela, Fabienne Warmont, Mikael Motelica-Heino. Nonionic organoclay: A ‘Swiss Army knife’ for the adsorption of organic micro-pollutants?. Journal of Colloid and Interface Science, 2015, 437, pp.71 - 79. ⟨10.1016/j.jcis.2014.09.043⟩. ⟨insu-01088187⟩