Considering a double JC model, this paper investigates the quantum discord dynamics of two isolated moving two-level atoms each interacting with a single-mode thermal cavity field, and studies the effect of the atomic motion and the field-mode structure on quantumdiscord. The results show that, on the one hand the quantum discord evolves periodically with time and the periods are affected by the atomic motion and the field-mode structure; on the other hand, the quantum discord still can capture the quantum correlation between the two atoms when the entanglement is zero. It is interesting to note that the quantum discord can be effectively preserved by controlling the field-mode structure parameter

The BiFeO₃ nanopowders were applied in the degradation of highly concentrated methyl orange dye through friction catalysis. The mechanism involves electron transitions, with the holes in the valence band participating in the degradation process.

Dye wastewaters are produced in huge amounts every year world-widely and they pose serious threats to ecosystems and human health if not treated properly. High-concentration organic dye wastewaters are usually treated through multiple steps including pretreatment and advanced treatment. In this work, TiO₂ nanoparticles suspended in high-concentration rhodamine B (Rh B) solutions up to 500 mg/L have been subjected to magnetic stirring to initiate tribocatalytic degradation of Rh B. While 100 and 200 mg/L Rh B solutions can be rather thoroughly degraded in beakers with four kinds of bottom/coatings (glass, Al₂O₃, Ti, and PTFE), 300 mg/L Rh B solutions can only be degraded effectively in a beaker with PTFE coating. Even 400 and 500 mg/L Rh B solutions can also be degraded rather thoroughly by TiO₂ nanoparticles in a PTFE-coated beaker. EPR analyses revealed that PTFE coating enhanced the formation of both hydroxyl radicals and superoxide radicals by magnetic stirring-stimulated TiO₂ nanoparticles. These findings highlight the importance of the synergism between materials in friction pairs for tribocatalysis and demonstrate a one-step tribocatalytic degradation of Rh B solutions with concentrations of real Rh B wastewaters.