Synthesis and application of diethanolamine-functionalized polystyrene as a new sorbent for the removal of p-toluenesulfonic acid from aqueous solution

Abstract

Polystyrene resin was functionalized by diethanolamine for the efficient removal of p-toluenesulfonic<br><br>acid (p-TSA) from aqueous solution. Functionalized adsorbent (DEA-PS) was characterized by elemental<br><br>analysis, Fourier transform infrared spectroscopy, point of zero charge measurement and field-emission<br><br>scanning electron microscopy. According to the results, maximum removal of p-TSA was observed at the<br><br>pH range of 2.5–5. The adsorption kinetics of p-TSA onto DEA-PS was represented by pseudo-first-order<br><br>model and the equilibrium data followed Langmuir model well. The adsorption process was<br><br>endothermic and spontaneous, along with the positive change of entropy. The regeneration of DEAPS<br><br>was also conducted by 1 M NaOH solution.