Synergistic degradation of acid orange 7 dye by using non-thermal plasma and g-C3N4/TiO2: Performance, degradation pathways and catalytic mechanism

摘要: Abstract In order to harness the full capability of ultraviolet and visible light in dielectric barrier discharge induced non-thermal plasma (DBD-NTP) process, g-C3N4/TiO2 catalysts were prepared utilized this process. Synergistic degradation acid orange 7 (AO7) dye by DBD-NTP was conducted, performance, pathways synergistic catalytic mechanism investigated. The results showed that rate AO7 g–C3N4–15/TiO2 process increased 39.1% compared with single at 12 min time. At 20 W input power, initial concentration 5 mg/L, dosage 0.5 g/L, pH value 10.0 air flow 52 L/h, reached 100.0% after Higher power inhibited degradation, whereas increasing solution promoted degradation. consisted azo structure destruction, ring opening reaction, hydroxylation, carboxylation mineralization reaction. radical trapping experiment O2 −, h+, OH, O3 H2O2 main reactive species for Z-scheme photocatalytic catalyst proposed.