Sonochemical degradation for toxic halogenated organic compounds

Teo, Khay Chuan; Xu, Yangguang; Yang, Chun

doi:10.1016/s1350-4177(01)00083-9

Cited by 89 publications

(24 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the last decade there has been an increased interest in ultrasound to degrade chlorinated phenolic contaminants present in water and/or wastewater (Bapat et al 2008;Chowdhury and Viraraghavan 2009;Isariebel et al 2009;Katsumata et al 2007;Nakui et al 2009;Rehorek et al 2007;Svitelska et al 2004;Vassilakis et al 2004). Compared with other treatment technologies such as UV light, high voltage corona, incineration, and solvent extraction, it is known that sonochemical degradation has significant advantages such as safety, cleanliness, and energy conservation without causing secondary pollution (Hao et al 2003;Teo et al 2001). In general, the sonochemical degradation of pollutants in an aqueous phase occurs as a result of imploding cavitation bubbles and involves representatively two reaction pathways such as pyrolysis inside the bubble and/or at the bubble-liquid interface and hydroxyl radical induced reactions at the bubble-liquid interface and/or in the liquid bulk (Adewuyi 2001).…”

Section: Introductionmentioning

confidence: 99%

Sonochemical Degradation of Chlorinated Phenolic Compounds in Water: Effects of Physicochemical Properties of the Compounds on Degradation

Park

Her

Yoon

2010

Water Air Soil Pollut

View full text Add to dashboard Cite

This study examined a comparative degradation of various chlorinated phenolic compounds including phenol, 4-chlorophenol (4-CP), 2,6-dichlorophenol (2,6-DCP), 2,4,6-trichlorophenol (2,4,6-TCP), 2,3,4,6-tetrachlorophenol (2,3,4,6-TeCP), and pentachlorophenol (PCP) using 28, 580, and 1,000 kHz ultrasonic reactors. The concentration of hydrogen peroxide was also determined in order to investigate the efficacy of different sonochemical reactors for hydroxyl radical production. Clearly, it was observed that the 580 kHz sonochemical reactor had maximum efficacy for hydroxyl radical production. The degradation of all the compounds followed the order; 580 kHz (91-93%) > 1,000 kHz (84-86%) > 28 kHz (17-34%) with an initial concentration of 2.5 mg L −1 at a reaction time of 40 min with ultrasonic power of 200 ± 3 W and aqueous temperature of 20 ± 1°C in each experiment. Overall, the degradation of those phenolic compounds followed the order, PCP > 2,3,4,6-TeCP > 2,4,6-TCP > 2,6-DCP > 4-CP > phenol at various frequencies in the presence/absence of a radical scavenger (tert-butyl alcohol). It was revealed that the correlations between the compound degradation rates and the physicochemical parameters, R 2 = 0.99 for octanol-water partition coefficient, R 2 = 0.95 for water solubility, R 2 = 0.94 for vapor pressure, and R 2 = 0.88 for Henry's law constant, excluding PCP, were very good in the entire range of each parameter.

show abstract

Section: Introductionmentioning

confidence: 99%

Sonochemical Degradation of Chlorinated Phenolic Compounds in Water: Effects of Physicochemical Properties of the Compounds on Degradation

Park

Her

Yoon

2010

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…Teo et al [40] reported that the increase in concentration of H 2 O 2 increased the initial rate of degradation of 0.4 mM of p-chlorophenol with an increase in H 2 O 2 concentration from 0 to 20 mM but further increase in H 2 O 2 concentration to 40 mM showed a marginal effect on degradation. Furthermore, the increase in concentration beyond 40 mM decreased the rate of degradation.…”

Section: Effect H 2 O 2 Dosagementioning

confidence: 99%

Intensification of textile effluent chemical oxygen demand reduction by innovative hybrid methods

Nachiappan

Muthukumar

2010

Chemical Engineering Journal

View full text Add to dashboard Cite

“…Teo et al 25 studied the effect of hydrogen peroxide on the degradation of 4-CP. It was observed that initially the decomposition rate of 4-CP increased with the concentration of hydrogen peroxide, reaching a maximum at C H 2 O 2 = 30 mM, approximately.…”

Section: Cah Degradation Promoted By Ultrasonic Irradiation Alonementioning

confidence: 99%

Recent trends in the decomposition of chlorinated aromatic hydrocarbons by ultrasound irradiation and Fenton's reagent

Liang

Komarov

Hayashi

et al. 2007

J Mater Cycles Waste Manag

View full text Add to dashboard Cite

Over the past few years, a large number of studies have been conducted on the use of ultrasound for decomposition of harmful organic pollutants, particularly chlorinated aromatic hydrocarbons (CAH) in wastewater. The published reports cover a variety of applications, including both ultrasonic treatment alone and in combination with other methods, e.g., advanced chemical oxidation processes. This article presents a review of recent work on ultrasonicbased methods of CAH decomposition, with emphasis on the applications of ultrasound alone and in combination with Fenton's reagent, as attractive advanced oxidation systems. In the fi rst part of this review, the basic principles of sonochemical treatment are presented, followed by a review of the applications of ultrasound alone for CAH degradation. In the second part, the mechanisms of CAH degradation with Fenton's reagent and its application for CAH degradation are summarized. In the fi nal part, studies on the applications of ultrasound together with Fenton's reagent are reviewed. The reported results suggest that a combination of ultrasound and Fenton's reagent is more attractive for practical application than the use of either method separately. Further studies, however, are required in this area because the reaction mechanism and the relationship between the reaction rates and process parameters for such a combined process are not yet well established.

show abstract

Sonochemical degradation for toxic halogenated organic compounds

Cited by 89 publications

References 5 publications

Sonochemical Degradation of Chlorinated Phenolic Compounds in Water: Effects of Physicochemical Properties of the Compounds on Degradation

Sonochemical Degradation of Chlorinated Phenolic Compounds in Water: Effects of Physicochemical Properties of the Compounds on Degradation

Intensification of textile effluent chemical oxygen demand reduction by innovative hybrid methods

Recent trends in the decomposition of chlorinated aromatic hydrocarbons by ultrasound irradiation and Fenton's reagent

Contact Info

Product

Resources

About