Catalysis of rGO-WO nanocomposite for aqueous bisphenol A degradation in dielectric barrier discharge plasma oxidation process.

Due to the multi-catalysis of the WO and excellent properties of the graphene (GO), a series of rGO-WO nanocomposites were prepared through the hydrothermal synthesis procedure by changing the material ratio, the reaction temperature and the reaction time in this paper, and then added it into a dielectric barrier discharge plasma (DBDP) system for investigating the bisphenol A (BPA)'s degradation and corresponding catalytic mechanism of the rGO-WO in the DBDP system. The obtained results show that there was an optimum dosage of the rGO-WO (40 mg/L) as well as the preparation conditions (5:1000 mass ratio of the GO and the WO, 18 h reaction time and 120 °C reaction temperature) for achieving the highest catalytic effect, and the highest degradation rate constant of the BPA was 0.03129 min. The determined higher TOC removal, higher COD removal as well as UV-Vis analysis also demonstrated the catalysis of the rGO-WO. The measurement of the change of the O and the HO concentrations in the reaction system with or without the rGO-WO and with or without the BPA proved the catalysis of the rGO-WO on the ·OH formation, while the combination of the GO had the positive effect for enhancing the catalytic effect. A figure on the catalysis and degradation procedure of the BPA in the DBDP/rGO-WO system was provided in the paper.