Coupled Organoclay/Micelle Action for the Adsorption of Diclofenac

Tiago De Oliveira, Regis Guegan

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A Na-smectite clay mineral (Na-Mt) was exchanged with various amounts of benzyldimethyltetradecyl ammonium chloride cationic surfactant (BDTAC) up to four times the cation exchange capacity (CEC). The adsorption properties of these organoclays as well as a coupled micelle/organoclay process were evaluated to remove an anionic pharmaceutical product, the diclofenac (DCF), recognized as a recalcitrant compound for conventional water treatments and to be poorly adsorbed onto untreated clay mineral. The DCF affinity appears to depend on the lipophilic character of organoclays in correlation to the density of intercalated BDTA and is particularly enhanced for sorbent systems with free surfactant or micelle in solution. The combination of both organclay and BDTA in excess or micelle as a one pot adsorption system appears to be the most efficient material for the sequestration of DCF and other pharmaceutical products (PPs) with a KF Freundlich constant of 1.7 L g-1 and no restriction of the adsorbed DCF amount as the linear adsorption isotherm shows. A BDTA hydrophobic core micelle coupled with a positive electric charge forms an organic complex with DCF that is properly intercalated within the interlayer space of BDTA-Mt organoclays as both Fourier transform infrared (FTIR) and X-ray diffraction (XRD) data supported.

Original languageEnglish
Pages (from-to)10209-10215
Number of pages7
JournalEnvironmental Science and Technology
Volume50
Issue number18
DOIs
Publication statusPublished - 2016 Sep 20
Externally publishedYes

Fingerprint

organoclay
Organoclay
Diclofenac
Micelles
adsorption
Adsorption
surfactant
clay mineral
Clay minerals
drug
Ammonium Chloride
cation exchange capacity
Electric charge
smectite
Fourier transform
Cationic surfactants
water treatment
Sorbents
isotherm
Water treatment

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Coupled Organoclay/Micelle Action for the Adsorption of Diclofenac. / De Oliveira, Tiago; Guegan, Regis.

In: Environmental Science and Technology, Vol. 50, No. 18, 20.09.2016, p. 10209-10215.

Research output: Contribution to journalArticle

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