Reactive Blue Degradation in Aqueous Medium by Fe-Doping TiO2 Catalytic Nonthermal Plasma

In this paper, Fe-doping TiO₂ was introduced into a dielectric barrier discharge (DBD) process for catalytic nonthermal plasma (NTP) degradation of a mode organic pollutant reactive blue (KN-R). Plasma was generated in a DBD reactor; Fe-doping TiO₂ was prepared by the sol-gel process. The catalytic-NTP oxidation reactions were studied under various conditions including the examination of the effects of initial pH, KN-R concentrations, and catalyst dose. Typical results indicated the synergy between plasma excitation of KN-R followed by the catalytic action of Fe-doping TiO₂, which not only improved the conversion but also increased the mineralization efficiency. The determination of hydrogen peroxide and nitrate ions, and ultraviolet–visible absorption and Fourier transform infrared spectra analyses revealed that catalysts in a plasma system strengthen the mineralization of KN-R.