Mechanistic features of the sonochemical degradation of organic pollutants

Sivasankar, Thirugnanasambandam; Moholkar, Vijayanand S.

doi:10.1002/aic.11550

Cited by 23 publications

(14 citation statements)

References 79 publications

(102 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of this work confirm this aspect and agree well with similar observations in the literature [21,22]. However, it should be noted that no such systematic studies have been reported in the literature on the degradation of different solvents using hydrodynamic cavitation though some single component studies were reported using conventional cavitating devices such as an orifice.…”

Section: Effect Of Nature Of Solventsupporting

confidence: 92%

“…This indicates that no side products were formed during the cavitation process. All the FTIR spectra display a very broad absorption in the range 3000-2800 cm 21 with the maximum at 3468, 3450, , which are associated to OAH groups interacting with hydrogen bonds, i.e., molecular water. For toluene, absorbance peaks at 685 and 665 cm 21 corresponds to aromatic CAH out-of-plane bending [36].…”

Section: Mechanism Of Solvent Degradationmentioning

confidence: 99%

“…For toluene, absorbance peaks at 685 and 665 cm 21 corresponds to aromatic CAH out-of-plane bending [36]. The peak at 1637 cm 21 correspond to C@C stretches in the aromatic ring. For MEK and toluene (Figures 13b and 13c) peaks at 1640 and 1637 cm 21 corresponds to C@O group in alkenes.…”

Section: Mechanism Of Solvent Degradationmentioning

confidence: 99%

“…The peak at 1637 cm 21 correspond to C@C stretches in the aromatic ring. For MEK and toluene (Figures 13b and 13c) peaks at 1640 and 1637 cm 21 corresponds to C@O group in alkenes. It is clear from Figures 13a-13c that the FT-IR spectra of the degradation products were similar to that of initial solvents.…”

Section: Mechanism Of Solvent Degradationmentioning

confidence: 99%

See 3 more Smart Citations

Solvent degradation studies using hydrodynamic cavitation

Suryawanshi

Bhandari

Sorokhaibam

et al. 2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Hydrodynamic cavitation for the degradation of organic solvents was investigated in detail using a newer form of cavitating device-vortex diode. The results were also compared with that using conventional cavitating device orifice. Removal of three different organic solvents-acetone, methyl ethyl ketone (MEK), and toluene were studied on a pilot plant with capacity of 1 m 3 /h. The effect of different operating parameters such as inlet pressure, initial concentration, and reactor type on the degradation rate of solvent was investigated in detail. The results revealed that efficiency of solvent removal varies substantially with the change in physical operating conditions and nature of the solvent. It was found that up to 80% degradation could be achieved for toluene (cavitational yield 32.2 3 10 23 mg/J), substantially higher than that for acetone and MEK indicating the effect of molecular weight/structure in the degradation process. Further, the results clearly indicated chemical oxidation as a predominant mechanism for degradation and not physical destruction. Vortex diode that works on the principle of vortex generation for cavitation, was found to be far superior over conventional cavitating device-orifice-up to eight times higher cavitational yield could be obtained for toluene as compared to orifice. The results of this study provide newer insight into solvent removal using hydrodynamic cavitation and would have bearing on the treatment of solvent containing wastewaters.

show abstract

Section: Effect Of Nature Of Solventsupporting

confidence: 92%

Section: Mechanism Of Solvent Degradationmentioning

confidence: 99%

Section: Mechanism Of Solvent Degradationmentioning

confidence: 99%

Section: Mechanism Of Solvent Degradationmentioning

confidence: 99%

See 2 more Smart Citations

Solvent degradation studies using hydrodynamic cavitation

Suryawanshi

Bhandari

Sorokhaibam

et al. 2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…This model has been extensively described in our previous articles. 33,34 For the convenience of the reader, we reproduce here only the main components of the model and relevant data/boundary conditions. For greater details on this model, we refer the reader to our earlier articles 33,34 as well as the original article of Toegel et al, 32 and Storey and Szeri.…”

Section: Bubble Dynamics Modelmentioning

confidence: 99%

Physical mechanism of sono‐Fenton process

2013

Self Cite

View full text Add to dashboard Cite

Hybrid advanced oxidation processes (AOPs), where two or more AOPs are applied simultaneously, are known to give effective degradation of recalcitrant organic pollutants. This article attempts to discern the physical mechanism of the hybrid sono-Fenton process with identification of links between individual mechanism of the sonolysis and Fenton process. An approach of coupling experimental results with simulations of cavitation bubble dynamics has been adopted for two textile dyes as model pollutants. Fenton process is revealed to have greater contribution than sonolysis in the overall decolorization of both dyes. H 2 O 2 added to the liquid medium as a Fenton reagent scavenges• OH radicals produced by cavitation bubbles. Addition of only H 2 O 2 to the medium during sonolysis does not yield marked difference in decolorization. Elimination of transient cavitation with application of elevated static pressure to the medium does not alter the extent of decolorization. The synergy between sonolysis and Fenton process is, thus, revealed to be negative. The dissolved oxygen in the medium is found to play an important role in decolorization through conservation of oxidizing radicals.

show abstract

Modeling the ultrasonic cavitation‐enhanced removal of nitrogen oxide in a bubble column reactor

Adewuyi

Khan

2011

AIChE Journal

View full text Add to dashboard Cite

A model study of the sonochemical removal of nitric oxide (NO) in a bubble column reactor is presented. The detailed model is developed to investigate the actual cavitation phenomena taking place during the absorption of NO. The expansion and subsequent collapse of cavitation bubble according to the theory of cavity collapse—initially developed by Lord Rayleigh and then improved on by coupling the energy balance equation of the bubble and the chemical reactions taking place inside the cavity to calculate the composition of different species formed during the collapse—are modeled. The model takes into consideration (1) cavitation bubble dynamics, (2) generation and transfer of oxidizing species from bubble collapse through reaction kinetics, (3) transfer of NO from gas to liquid, and (4) chemical reactions of oxidizing species with dissolved NO. The results of the simulations surprisingly indicate that the chemistry induced by ultrasonic cavitation cannot explain the absorption of NO beyond about 30% of the inlet concentration if the mass transfer is assumed to be the same as that in the bubble column without ultrasound. When experimental values of mass‐transfer coefficients, calculated in the studies by other researchers (which are in the range of about five times the physical mass‐transfer coefficient in a bubble column), are used, absorption up to 80% are calculated in the simulations consistent with experimental results obtained from the sonochemical bubble column reactor. The present model provides a framework on which more robust and rigorous models can be developed for the complex gas‐liquid sonochemical systems and reactors. © 2011 American Institute of Chemical Engineers AIChE J, 58: 2397–2411, 2012

show abstract

Mechanistic features of the sonochemical degradation of organic pollutants

Cited by 23 publications

References 79 publications

Solvent degradation studies using hydrodynamic cavitation

Solvent degradation studies using hydrodynamic cavitation

Physical mechanism of sono‐Fenton process

Modeling the ultrasonic cavitation‐enhanced removal of nitrogen oxide in a bubble column reactor

Contact Info

Product

Resources

About