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Ozone is widely used in industrial production, disinfection, and pollution control. To improve the ozone generation ability of dielectric barrier discharge (DBD), micro-holes with a diameter of about 50 µm in dielectric were introduced to optimize the discharge process. Experimental results indicate that the micro-holes in dielectric can increase the ozone concentration by lowering the inception voltage and boosting the intensity of electric discharge of the DBD device. A voltage of 16.7 kV and flow rate of 3 L/min, the DBD device with 40 micro-holes has an ozone concentration of 680 mg / L and provides an ozone yield of 320 g / kWh, while the device without micro-holes has an ozone concentration of only 150 mg/L and provides an ozone yield of only 180 g/kWh. The micro-hole in the dielectric plays the effect similar to that of micro hollow cathode, which can not only directly affect the ozone generation ability, but also affect the effect of other factors on ozone generation, such as discharge voltage, air flow rate, and gap space between dielectrics. The promotion of ozone generation by micro-hole can be used to design high-performance ozone generators and provide ideas for reusing ozone generators damaged by dielectric breakdown. [ABSTRACT FROM AUTHOR]

In this study, a novel nano-La(OH) 3 /porous carbon composites derived from La alginate xerogel with egg-box structure had been successfully synthesized by a gradient heat treatment in nitrogen atmosphere. This facile fabrication strategy can be easily employed to considerably encapsulate La(OH) 3 nanoparticles uniformly into the porous carbon matrix derived from the alginate macromolecule framework. The optimized sample, labeled as LS-550(N), exhibited extremely high phosphate uptake and great selectivity. The adsorption kinetic process dramatically followed pseudo-second-order model. The Langmuir model fitted maximum equilibrium adsorption capacity is 133.58 mg·g -1 . The phosphate adsorption mechanisms could be consist of electrostatic interaction, complexation and ligand exchange interaction on the surface of LS-550(N). The prominent practical applicability of LS-550(N) in the regeneration test suggests that the LS-550(N) could be a potential adsorption candidate for the decontamination of phosphate-containing natural water bodies., (Copyright © 2022 Elsevier B.V. All rights reserved.)