Hierarchical Bi0.5Fe0.5VO4/honeycomb ceramic plate synergize plasma induce multi-catalysis by constructing a plasma-catalyst system for organic pollutant degradation

Highly efficient Bi0.5Fe0.5VO4/honeycomb ceramic plate (Bi0.5Fe0.5VO4/HCP) was successfully prepared and placed in the discharge zone of the dielectric barrier discharge (DBD) to construct a DBD plasma-catalyst system. Doxycycline Hyclate (DH), an antibiotic widely used in aquaculture was selected to estimate the catalytic activity. The synergistic effect makes the system exhibit excellent catalytic activity and mineralization ability. A series of characterization technologies were employed to systematically investigate the as-prepared photo catalysts. Additionally, the effect of different initial conditions (pH, power, water matrices, etc.) on DH removal was evaluated. The 3D EEMs results distinctly present the process of DH being mineralized, and the significantly enhanced TOC removal rate indicates that Bi0.5Fe0.5VO4 can promote the increase of mineralization rate. The formation and role of active specials ((OH)-O-center dot, O-3, and H2O2, etc.) were also deeply investigated. Furthermore, possible DH degradation pathways were proposed based on LC-MS analysis and theoretical calculations. Comprehensive toxicity analysis revealed that a decreasing trend in the toxicity of the intermediates. Eventually, the DBD plasma-catalyst reaction mechanism was investigated in detail. This study provides an effective and simple technical route to combine different advanced oxidation processes in a synergistic way to treat wastewater.

Automated summary

Highly efficient Bi0.5Fe0.5VO4/honeycomb ceramic plate (Bi0.5Fe0.5VO4/HCP) was successfully prepared and used in a DBD plasma-catalyst system. The system exhibited excellent catalytic activity and mineralization ability. Through characterization technologies and variation of experimental conditions, the performance and mechanism of the prepared catalyst were investigated, and possible pathways for wastewater treatment were proposed.