Influence of particles on sonochemical reactions in aqueous solutions

Ultrasonic Enhanced Desorption of DDT from Contaminated Soils

“…Under ultrasonication, the soil particle surfaces act as nuclei and cavitation occurs at the soil surface (Keck et al 2002). The asymmetric cavities formed, during collapse, yield about 5,000°C and 500 atmospheres pressure (Ashokkumar and Grieser 2005).…”

Sono-oxidation of soils: degradation of naphthalene by sono-Fenton-like process

“…This is in a good agreement with the work performed by Thangavadivel and coworkers (2009) who researched the ultrasound-assisted removal of DDT from artificially contaminated sand (Thangavadivel et al 2009). According to Keck and coauthors (2002), the applied ultrasound irradiation will induce cavitation on the soil particles surface as well as in the liquid (Keck et al 2002). These cavities provide a sink of low concentration or partial pressure of the contaminant into which adsorbed material will desorb (Meegoda and Perera 2001).…”

Sonocatalytic degradation of C.I. Reactive Red 198 in H2O2-based Systems

“…The following explanations are proposed for the US/H 2 O 2 /ZnO system; (i) the presence of additional liquidsolid interface in the liquid bulk promoted the cavitation and (ii) US accelerated mass transfer between the solution phase and the ZnO surface, so that the decolorization rate of the US/H 2 O 2 /ZnO system exceeded those of the US and US/H 2 O 2 systems. Keck et al [17] reported that particle addition can double the reaction rate of that without particles. Wang et al [7] suggested that US irradiation can lead to the formation of US-induced luminescence with a wavelength of less than 375 nm; excite ZnO particles that act as a photocatalyst, and cause numerous hydroxyl radicals with high oxidative activity to form on the surface of the ZnO particles.…”