Multi‐Component Adsorption of Benzene, Toluene, Ethylbenzene, and Xylene from Aqueous Solutions by Montmorillonite Modified with Tetradecyl Trimethyl Ammonium Bromide

Abstract

Multicomponent adsorption of benzene, toluene, ethylbenzene, and xylene (BTEX) was assessed in aqueous solutions by montmorillonite modified with tetradecyl trimethyl ammonium bromide (TTAB-Mt). Batch experiments were conducted to determine the influences of parameters including loading rates of surfactant, contact time, pH, adsorbate concentration, and temperature on the adsorption efficiency. Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to determine the adsorbent properties. Results showed that the modification of the adsorbent via the surfactant causes structural changes of the adsorbent. It was found that the optimum adsorption condition achieves with the surfactant loading rate of 200% of the cation exchange capacity (CEC) of the adsorbent for a period of 24 h. The sorption of BTEX by TTAB-Mt was in the order ofB<T<E<X. The experimental data were fitted by many kinetic and isotherm models. The results also showed that the pseudo-second-order kinetic model and Freundlich isotherm model could, respectively, be fitted to the experimental data better than other available kinetic and isotherm models. The thermodynamic study indicated that the sorption of BTEX with TTAB-Mt was achieved spontaneously and the adsorption process was endothermic as well as physical in nature. The regeneration results of the adsorbent also showed that the adsorption capacity of adsorbent after one use was 51% to 70% of original TTAB-Mt.

Sedimentation of pollutant­containing aggregates during purification of wastewater from coking plants

“…World experience [6][7][8][9][10][11] in the development of new technologies for water purification contaminated with organic substances, which are capable of forming stable emulsions, proves the expediency of the use of various types of natural disperse minerals (bentonite, glauconite or paligrosite clays). Clays can be used both in natural form and after special activation (modification of clay surface with surfactants or special inorganic substances).…”

“…Under conditions of a purification process at coke enterprises, such a low pH value is irrational (the reaction of the medium lies within the range of 7.3−8.3). The adsorption capacity of TTAB-Mt in relation to PAH decreases in the range of xylene>ethylbenzene>toluene>benzene [7]. It is naphthalene that defines physical and chemical properties of resins as the main component of an identified part of a chemical composition [8].…”

“…Numerous scientific papers [1][2][3][4][5][6][7][8][9][10][11][12] describe it. There are many coke enterprises in Dnipropetrovsk and especially Donetsk regions.…”

Tin(IV) oxide nanoparticles grafted with N,N-dimethylacrylamide–allyl butyl ether for xylene adsorption

“…There was agreement between the q e calculated by the pseudo-second-order Modeling of adsorption of xylene onto AD-GNS a pseudo-second-order model; b intra-particle diffusion model kinetic model and the experimental q e , indicating that the pseudo-second-order model better represented the adsorption kinetics. Researchers have reported that the sorption of xylene with raw and thermally modified diatomite and TTAB-MT is well described by the pseudo-second-order model (Nourmoradi 2012). …”

“…Many absorbents can be used for adsorption of xylene from aqueous solutions, including carbon nanotubes, organoclay, activated carbon, diatomites, and nano-sorbents (Aivalioti et al 2012b;Lin and Huang 1999;Nourmoradi 2012). Nano-materials have interesting properties that differ from those of their corresponding bulk states which make them promising sorbents in aqueous solutions (Paraguay-Delgado et al 2005;cheng et al 2004).…”