Pulsed discharge plasma (PDP) combined with TiO/WO composites for chloramphenicol (CAP) degradation was investigated. The prepared TiO/WO composites were characterized by scanning electron microscope, transmission electron microscope, nitrogen adsorption apparatus, zeta sizer, X-ray diffraction, Raman spectra, UV-Vis absorption spectroscopy, X-ray photoelectron spectroscopy, photocurrent and electrochemical impedance spectroscopy. The degradation performance showed that the addition of TiO/WO composites significantly enhanced the removal efficiency of CAP in PDP system. At a peak voltage of 18 kV, the highest removal efficiency of CAP could reach 88.1% in PDP system with 4 wt% TiO/WO, which was 36.8% and 26.0% higher than that in sole PDP system and PDP/TiO system, respectively. The TiO/WO composites significantly accelerated interfacial charge transfer process compared to the pure TiO. Besides, the effect of catalyst dosage and peak voltage on CAP removal was evaluated. OH, OO, h and high-energy electrons contributed to CAP degradation in PDP-TiO/WO system. Addition of TiO/WO composites can decompose O and produce more OH and HO. The degradation intermediates were measured by liquid chromatography-mass spectrometry (LC-MS) and ion chromatography (IC). The cycling degradation experiment showed that the TiO/WO composites have good reusability as well as stability.
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