Coating disk-shaped materials on the bottoms of containers has become a highly effective method for tribocatalysis enhancement. Here, the effects of Ti coatings on the tribocatalytic degradation of organic dyes by CdS nanoparticles were systematically studied. For both 50 mg/L rhodamine B (RhB) and 20 mg/L methyl orange (MO) solutions, the tribocatalytic degradation by CdS nanoparticles was dramatically enhanced in Ti-coated beakers compared to as-received glass-bottomed beakers, with the degradation rate constant increased by 4.77 and 5.21 times, respectively. Moreover, for tribocatalytic degradation of MO using CdS, two quite different MO degradation modes were identified between Ti and Al₂O₃ coatings. Electron paramagnetic resonance (EPR) spectroscopy analyses showed that more radicals were generated when CdS nanoparticles rubbed against the Ti coating than against the glass bottom, and boron nitride nanoparticles were employed to verify that the enhancement associated with the Ti coating resulted from the interactions between Ti and CdS. These findings underscore the importance of catalyst and coating material selection in tribocatalytic systems, offering valuable insights for the development of efficient environmental purification technologies.

Coating disk-shaped materials on the bottoms of containers has become a highly effective method for tribocatalysis enhancement. Presently, the effects of Ti coatings on the tribocatalytic degradation of organic dyes by CdS nanoparticles have been systematically studied. For both 50 mg/L rhodamine B (RhB) and 20 mg/L methyl orange (MO) solutions, the tribocatalytic degradation by CdS nanoparticles was dramatically enhanced in Ti-coated beakers than in as-received glass-bottomed beakers, with the degradation rate constant increased by 4.77 and 5.21 times, respectively. Moreover, for tribocatalytic degradation of MO using CdS, two quite different MO degradation modes have been identified between Ti and Al2O3 coatings. Electron paramagnetic resonance (EPR) spectroscopy analyses showed that more radicals were generated when CdS nanoparticles rubbed against Ti coating than glass bottom, and boron nitride nanoparticles had been employed to verify that the enhancement associated with Ti coatings resulted from the interactions between Ti and CdS. These findings underscore the importance of catalysts and coating materials selection in tribocatalytic systems, offering valuable insights for the development of efficient environmental purification technologies.

A small-percentage mixture of CuO-BaTiO₃ heterojunction was prepared by Rapid Thermal Processing (RTP), significantly improving its visible light photocatalytic rate. By mixing a small amount of CuO with BaTiO₃ and subjecting it to RTP at a temperature rise rate of 200 °C/s, we obtained samples with a tetragonal perovskite structure characteristic of BaTiO₃. SEM images revealed a multitude of small particles and sharply defined shapes within the sample. The CuO-BaTiO₃ heterojunction showed no significant improvement in UV photocatalytic rate but a marked enhancement under visible light. The 5% mol CuO doping increased the degradation rate constant by 2.78 times under visible light irradiation. The enhanced photocatalytic efficiency is generally attributed to an optimal band gap and a large effective contact area. This study found that the enhanced visible light response of the RTP-made heterojunction was key to boosting its photocatalytic efficiency. RTP improved this by refining the junction structure, removing grain boundary defects, and reinforcing the boundaries, optimizing the interaction area between materials for the best electric field, thus enhancing light absorption and photocatalysis. The study shows RTP’s ability to enhance and optimize semiconductor performance, offering insights for future semiconductor research and applications.

This study utilized natural seashells as raw materials to fabricate BaTiO ₃ ceramics doped with varying amounts of calcined natural shell powder via solid-state sintering. The effects on the dielectric properties and microstructure were investigated. Results indicated that doping led to changes in the lattice constants and caused a leftward shift in XRD peaks, while preserving the tetragonal phase. SEM analysis revealed that doping restrained grain growth. Regarding dielectric properties, doping reduced the dielectric loss of BaTiO ₃ to below 0.025 and enhanced its stability. However, the dielectric constant decreased with increasing doping content. Among the samples, the one doped with 0.25 wt% calcined natural shell powder exhibited the optimal performance. This study offers new perspectives and methods for the preparation and application of BaTiO ₃ -based ceramic materials, while providing theoretical support for the reutilization of waste seashells.