Removal of Benzene Using the Characteristics of Block Copolymers for Encapsulation

Abstract

This study assessed the aqueous benzene removal capacity of a polymeric adsorbent, based on an amphiphilic material, in a batch experiment. Two types of polystyrene-block-poly(N-isopropylacrylamide) have structures containing a hydrophobic core and hydrophilic shell. The encapsulation mechanism of benzene by a polymeric adsorbent was investigated, and found to be attributable to the Van der Waals interactions between the benzene aromatic ring and the hydrophobic core of the adsorbent. The equilibrium data were analyzed using the Langmuir and Freundlich adsorption isotherms, and found to be a good fit to both. The maximum adsorption capacity for benzene by the polymeric adsorbent was found to be 194.53 mg/g. The kinetic data followed a pseudo-first-order kinetic model. Polystyreneblock-poly(N-isopropylacrylamide) showed the potential to be an effective adsorbent for application to wastewater treatment.

β-cyclodextrin-MCM-41 silica as promising adsorbent for the trace amounts removal of aromatics from water

“…However, adsorption has been shown to be one of the most effective procedures in the elimination of benzene and its derivatives from aqueous solutions. A number of adsorbents were used for benzene and phenol adsorption from water mixtures, such as activated carbons [4][5][6], zeolites [7,8], ceramic and polymeric materials [9][10][11][12][13], and bioadsorbents [14,15]. Even taking into account the advantages of these adsorbents, their potential application is often limited by the cost of material, the low efficiency at trace concentration of analytes, and the necessity of sorbent regeneration at high temperatures.…”