New insights into surface-functionalized swelling high charged micas: Their adsorption performance for non-ionic organic pollutants

Abstract

The major components of the wastewater from the petroleum refineries are benzene, toluene and phenol and one of the techniques applied to the treatment of effluents is sorption using organo-functionalized clay. The materials exploited in the present study are a family of surface-functionalized synthetic micas and their sorption capacities for non-ionic organic pollutants are analyzed. The organo-functionalization of their surface provides them the capacity to sorb effectively non-ionic pollutants in the interface. Their adsorption performance is a function of the alkylamonium properties such as the chain * Corresponding author E-mail: alba@icmse.csic.es 2 length, the mass fraction and the organization of the organic cation in the interlayer space of the micas.

Influence of framework and interlayer on the colloidal stability of design swelling high-charged micas

“…These swelling high charged micas, in which the layer charge can be adjusted, could be highly valuable for the decontamination of harmful metal cations via ion-exchange reactions [5] and for the selective removal of highly radioactive ions [6,7] and hydrocarbon molecules [8,9]. In fact, those synthetic micas overcome some limitations of the natural clay minerals to be used as host materials.…”

“…Organoclays have important applications as adsorbents of organic pollutants [13] and as components for the formation of clay polymer nanocomposites [10,14]. In concrete, the organo-functionalized synthetic swelling micas with long chain alkylammonium cations have shown a good adsorption capacity of nonionic hydrocarbons [9]. Stability on solution of clay minerals and the transition between stable colloidal dispersions and coagulated or flocculated systems are decisive processes for their applications in several industrial processes as well as in soil chemistry and environmental science.…”

“…In spite of the applicability of Na-Mica-n on environmental decontamination [5][6][7][8][9], up to our knowledge, their colloidal stability has not been explored yet. Thus, the goal of this research was to determine the colloidal stability of the Na-Mica-n and to modify it as a function of their tuneable structural and compositional parameters such as total layer charge or interlayer space composition.…”

Bionanocomposites based on chitosan intercalation in designed swelling high-charged micas

“…Moreover, their physical and chemical properties can be easily tuneable by an appropriate synthesis method 40–43 . These synthetic clay minerals have been successfully applied for the selective removal of heavy metals 40 , highly radioactive ions 44,45 and hydrocarbon molecules after an appropriate surface modification 46,47 . In fact, they overcome the limited CEC and adsorption capacity of natural nanoclays, and, in particular, organo-functionalized swelling high charged micas have already shown their excellent sorption capacity for the non-ionic organic pollutants benzene, toluene and phenol 47 .…”

Effect of the crystal chemistry on the hydration mechanism of swelling micas

“…Unlike phlogopite, these materials have significant swelling capabilities and applications as decontaminants and storage media (Alba et al, 2006;Gregorkiewitz and Rausell-Colom, 1987;Park et al, 2002). These swelling high-charged micas, in which the layer charge can be adjusted, may be valuable for the decontamination of harmful heavy metal cations (Ravella et al, 2008) via ion-exchange reactions and for the selective removal of radioactive ions (Alba et al, 2006) and hydrocarbon molecules (Alba et al, 2011) (Pazos et al, 2017). Recently, it has been observed that the formation of Inner Sphere Complexes (ISC) by the cations in the interlayer space of swelling high charge mica was favored when the aluminum content in the tetrahedral layer increased (Pavón et al, 2014).…”