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This study delves into the intricate deposition dynamics of submicron particles within electric-flow coupled fields, underscoring the unique challenges posed by their minuscule size, aggregation tendencies, and biological reactivity. Employing an operando investigation system that synergizes microfluidic technology with advanced micro-visualization techniques within a lab-on-a-chip framework enables a meticulous examination of the dynamic deposition phenomena. The incorporation of object detection and deep learning methodologies in image processing streamlines the automatic identification and swift extraction of crucial data, effectively tackling the complexities associated with capturing and mitigating these hazardous particles. Combined with the analysis of the growth behavior of particle chain under different applied voltages, it established that a linear relationship exists between the applied voltage and θ. And there is a negative correlation between the average particle chain length and electric field strength at the collection electrode surface (4.2×105to 1.6×106V·m–1). The morphology of the deposited particle agglomerate at different electric field strengths is proposed: dendritic agglomerate, long chain agglomerate, and short chain agglomerate.

Plasma-coupled catalysis is a promising volatile organic compounds (VOCs) removal technology because of its interactional principles of plasma decomposition and catalytic oxidation. However, the problem of harmful by-products is still in trouble. A series of rare earth doped RE-NiOx(RE = Ce, Y, La) composite oxides were synthesized by metal organic frameworks (MOFs)-derived method for coupled plasma oxidation of benzene and by-product ozone removal. Compared with plasma alone, the 1%La-NiOxcatalyst shows the best enhancement of 50% for benzene conversion with complete removal of a maximum of 800 ppm ozone. The energy consumption for 90% benzene removal efficiency (η90%) is also reduced from 3600 to 1200 J/L. Characterization results of RE-NiOxcatalysts indicate that the doping of La causes interaction and synergistic effect between La and Ni, and the surface oxygen and lattice oxygen with defects play crucial roles in benzene oxidation and ozone decomposition, respectively. In addition, the decomposition mechanism of benzene and ozone under plasma is proposed. Plasma is responsible for the indiscriminate bond breaking in benzene and oxygen to form a variety of organic intermediates and ozone, while the La-NiOxcatalyst selectively oxidizes the intermediates to COx/H2O and decomposes the ozone into oxygen.