Adsorption of Methyl tert‐butyl Ether on Perfluorooctyl Alumina Adsorbents – High Concentration Range

Abstract

The performance of two types of perfluorooctyl alumina (PFOAL) adsorbents prepared using c-alumina (PFOAL A ) and alumina-active-basic® (PFOAL B ) is reported. The equilibrium adsorption behavior of the adsorbents was studied for adsorption of methyl tert-butyl ether (MTBE) in a wide range (5-1000 mg/L) of aqueous phase MTBE concentrations. The monolayer adsorption capacities were 3.3 and 3.5 mg MTBE/g adsorbent, and the maximum adsorption capacities were 7.1 and 6.3 mg MTBE/g adsorbent for PFOAL A and PFOAL B, respectively. The application of Freundlich, Langmuir, BET and BDDT (the general form of BET) isotherms were compared for the modeling of aqueous adsorption of MTBE on the surface of PFOAL adsorbents. It was shown that adsorption of MTBE on the surface of PFOAL is a type IV van der Waals adsorption, which is best modeled by the general form of the BET (BDDT) multilayer adsorption isotherm.

Adsorption Characteristics of Atrazine on Granulated Activated Carbon and Carbon Nanotubes

“…In Eq. (11), K S is the equilibrium constant of adsorption of the first layer and K L is the equilibrium constant of adsorption for the upper layers of ATZ on GAC [29]. It should be noted that in the kinetic experiments (Fig.…”

“…Langmuir and Freundlich isotherms have been employed previously to describe the adsorption of ATZ on GAC [7] and CNT [9]. BET (modified BET) and PMM adsorption models were successfully used to describe the adsorption of MTBE on perfluorooctyl alumina (PFOAL) [29] and ATZ on CNT [9], respectively.…”

“…Based on the potential theory of adsorption for liquids, Ebadi et al [30] modified the general BET gas phase adsorption model for application in liquid phase adsorption. They applied the modified BET isotherm model to express the adsorption of MTBE [29] on a PFOAL catalyst. The PMM is widely used for adsorption surfaces with heterogeneous energy distribution.…”

Kinetics of Catalytic Ozonation of Methyl tert‐Butyl Ether in the Presence of Perfluorooctyl Alumina

“…The surface coverage of the prepared PFOAL catalyst by perfluorooctyl groups is 3.6 lmol/m 2 . The details of the evaluation tests of the alumina support and the prepared PFOAL catalysts were published before [27].…”

“…Specific surface area and pore size of the base alumina support and prepared PFOAL catalysts were determined by physisorption of N 2 at its atmospheric boiling point. Details of the synthesis of PFOAL and its characterization are given elsewhere [27]. MTBE solutions used in ozonation experiments were prepared by dissolving appropriate amounts of MTBE in distilled water.…”