The influence of pressure on the acoustic cavitation in saturated CO2-expanded N, N-dimethylformamide

Gao, Hanyang; Pei, Kunkun; Hu, Guoxin; Liu, Wenxing; Meng, Aihua; Wang, Hongcheng; Shao, Huifeng; Li, Wenxin

doi:10.1016/j.ultsonch.2022.105934

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Figure 1 scehematically depicts the phenomenon of ultrasonic cavitation. It promotes the production of light with a range of wavelengths, called "sonoluminescence," and a large number of localized "hot spots" with very high temperatures (up to ~5000 K) and pressures (up to ~1000 atm) [59,60]. These localized "hot spots" can cause pyrolysis of H 2 O molecules, producing hydroxyl radicals (•OH) [61], which can effectively oxidize organic pollutants and even mineralize them into CO 2 and H 2 O [62][63][64][65][66].…”

Section: Sonocatalytic Mechanismmentioning

confidence: 99%

“…Furthermore, the rate of bubble nucleation at the solid surface can be significantly influenced by many factors. Sonication parameters, such as ultrasonic power, frequency, as well as changes in surface energy, aqueous temperature, and type of absorbed gas, can greatly affect this process [59]. In addition, physicochemical properties of the solid particles, such as roughness, particle size, pore size, and wettability, can play a crucial role in influencing the nucleation rate.…”

Section: Heterogeneous Nucleation Mechanismmentioning

confidence: 99%

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Application of Photocatalysis and Sonocatalysis for Treatment of Organic Dye Wastewater and the Synergistic Effect of Ultrasound and Light

Wang

Cheng

2023

Molecules

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Organic dyes play vital roles in the textile industry, while the discharge of organic dye wastewater in the production and utilization of dyes has caused significant damage to the aquatic ecosystem. This review aims to summarize the mechanisms of photocatalysis, sonocatalysis, and sonophotocatalysis in the treatment of organic dye wastewater and the recent advances in catalyst development, with a focus on the synergistic effect of ultrasound and light in the catalytic degradation of organic dyes. The performance of TiO2-based catalysts for organic dye degradation in photocatalytic, sonocatalytic, and sonophotocatalytic systems is compared. With significant synergistic effect of ultrasound and light, sonophotocatalysis generally performs much better than sonocatalysis or photocatalysis alone in pollutant degradation, yet it has a much higher energy requirement. Future research directions are proposed to expand the fundamental knowledge on the sonophotocatalysis process and to enhance its practical application in degrading organic dyes in wastewater.

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