Adsorption of bisphenol A onto cationic-modified zeolite

Abstract

This paper concerns with the adsorption of bisphenol-A (BPA) by modified zeolites which were prepared using an orthogonal experimental design. The preparation process was optimized by the defined conditions, i.e. that 10% of cetyltrimethyl ammonium bromide was used as the optimal modifier and processing time and temperature were 36 h and 25°C, respectively. The adsorption equilibrium of BPA onto the modified zeolite fits the Freundlich isotherm with a high correlation coefficient 0.996 and was defined by a second-order rate constant (K_v) of 1.07 g (mg h)⁻¹. Furthermore, the effects of solution chemical properties on the adsorption of BPA by modified zeolites were examined. The result reveals that the best adsorption temperature was 25°C, and the optimal pH ranged from 5.0 to 10.0. In addition, the adsorption capacity of BPA increased with concentrations of and decreased with increasing in concentrations of , OH⁻, and Al³⁺ in the test solution.

Keywords:

• Adsorption
• Bisphenol A
• Cationic-modified zeolite
• Orthogonal experimental design
• Water treatment

Notes

Presented at CEST2015—14th International Conference on Environmental Science and Technology, Rhodes, Greece, 3–5 September 2015