RESUMEN
In this study, dielectric barrier discharge (DBD) plasma combined with titanium dioxide/reduced graphene oxide/copper oxide (TiO2/rGO/Cu2O) composites for simultaneous removal of hexavalent chromium (Cr(â ¥)) and tetracycline (TC) from wastewater were explored systematically. The TiO2/rGO/Cu2O composites were successfully prepared to improve the specific surface area and charge carrier separation rate. When Cr(â ¥) and TC coexist, the two pollutants have better removal efficiency without changing the initial pH. Moreover, the removal efficiency of Cr(â ¥) and TC could be further improved in the DBD-TiO2/rGO/Cu2O system, indicating that the TiO2/rGO/Cu2O composites also exhibited good synergistic effects with the DBD plasma. The mechanism exploration showed that the TiO2/rGO/Cu2O composite catalyst could be activated in DBD system to produce various active species by photocatalytic reaction, among which photo-generated electrons and â¢O2- could significantly enhance Cr(â ¥) reduction, while photo-generated holes and â¢OH could improve TC degradation. More importantly, the intermediate products obtained from TC degradation can be oxidized to â¢CO2- by photo-generated holes, which can also facilitate the reduction of Cr(â ¥). This study shows that DBD combined with TiO2/rGO/Cu2O composites are capable of simultaneous Cr(â ¥) reduction and TC degradation, which would provide novel ideas for practical wastewater remediation.