Catalytic polymerization of bisphenol A using a horseradish peroxidase immobilized microporous membrane reactor

Abstract

Bisphenol A (BPA) is one of the most widely used chemical products, which is discharged into rivers and oceans, posing great hazards to organisms such as reproductive toxicity, hormone imbalance and cardiopathy induction. With the expansion harm of BPA, people have paid more attention to the environmental effects. In this paper, the degradation of BPA from the synthetic wastewater using the immobilization of horseradish peroxidase membrane reactor (HPR) was investigated. The immobilized HRP microporous membrane was prepared by the porous calcium alginate method. In addition, the reuse of the immobilized HPR membrane and the measurement of membrane flux showed that the membrane has good activity and stability. Finally, the experimental parameters including reaction time, pH, the concentration of BPA and the dosage of H2O2 were optimized to remove the BPA, and about 78% degradation efficiency of BPA was achieved at the optimal condition as follows: H2O2 to BPA molar ratio of 1.50 with an initial BPA concentration of 0.1 mol/L, the HPR dosage of 3.84 u/mL, the initial solution pH of 7.0, a temperature of 20 °C and a contact time of 10 min. HIGHLIGHTS Horseradish peroxidase (HRP) can be effectively immobilized on the membrane.; The immobilized HRP can maintain high activity and be circulation utilization.; The optimum conditions for the mole rate of H2O2/BPA dosage and the pH value are 1.5 and 7, respectively.;

Keywords

• bisphenol a
• enzymatic catalysis
• horseradish peroxidase
• microporous ultrafiltration membrane
• water pollution remediation