Coupled Organoclay/Micelle Action for the Adsorption of Diclofenac

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.

Tuning down the environmental interests of organoclays for emerging pollutants: Pharmaceuticals in presence of electrolytes

“…With the observation of additional bands related to those of the pharmaceuticals, FTIR technique confirms proper the adsorption of NFX onto layered materials onto layered materials (Figure 4). Additionally, this technique can give new insights in the moieties of the molecules in interaction with the layered materials as it could be discussed in previous research works (Guégan et al 2015, De Oliveira and Guégan 2016, De Oliveira et al 2017).…”

“…As expected, the proper intercalation of the surfactants within the interlayer space of the starting Na Since the adsorption properties of the organoclays mainly depend on the kind of surfactants used, two different surfactants of different nature (nonionic and cationic) and saturated and unsaturated were used. Thus, the prepared materials display complementary properties: from cation exchange capacity, and hydrophilicity for untreated Na-Mt, dual hydrophilicity/phobicity for Brij 0.4 -Mt; to hydrophobicity or organophilicity and even possible anion adsorption ability for BDTA-Mt (Guégan et al 2015, De Oliveira and Guégan 2016, De Oliveira et al 2017, De Oliveira et al 2018. In addition, the difference…”

“…The chemical modification of swelling-type clay minerals, by using surfactants of different nature: cationic, nonionic, zwitterionic to get organoclays, enhances the adsorption efficiency but also extents the range of adsorbed organic molecules (Stockmeyer 1991, Stapleton et al 1994, Liu and Gonzalez 1999, El-Nahhal and Safi 2004, Groisman et al 2004, Shen 2004, Gao and Pedersen 2005, Polubesova et al 2005, Bekçi et al 2006, Deng et al 2006, Polubesova et al 2006, Guégan et al 2009, Guégan 2010, Sarkar et al 2010, Zhang et al 2010, Guégan 2011, Lee et al 2011, Guegan 2013, Zha et al 2013, Thiebault et al 2015, De Oliveira and Guégan 2016, De Oliveira et al 2017, De Oliveira et al 2018. Thus, numerous studies pointed out the interests of organoclays as adsorbents, going as far as to suggest these materials as perennial and realistic solutions for the remediation of wastewater or as tertiary treatment for drinking water (Stockmeyer 1991, Polubesova et al 2005, Polubesova et al 2006, Undabeytia et al 2008).…”

“…Their presence in the natural environment at concentrations reaching several nanograms is recognized to cause adverse effects on many ecosystems and represents a public health matter involving the interests of numerous scientists focusing on the development of novel adsorbents (Adriano et al 2005, Bekçi et al 2006, Kim et al 2010, Liu et al 2011, Moussavi et al 2013, Kodešová et al 2015, De Oliveira and Guégan 2016, Nielsen and Bandosz 2016, De Oliveira et al 2017, Limousy et al 2017.…”

Removal of Zinc Ions Using Hydroxyapatite and Study of Ultrasound Behavior of Aqueous Media

“…Materials such as zeolite [10], clay minerals [11,12] and other organo-derived clay materials [13,14,15] have been reported to be promising candidates in the treatment of wastewater due to their excellent surface characteristics. Recent studies have reported that phosphate minerals represent promising materials in the treatment of wastewaters for the removal of fluoride and heavy metals [16,17].…”