Effects of dissolved gases and pH on sonolysis of 2,4-dichlorophenol

Uddin, Helal; Hayashi, Shigeo

doi:10.1016/j.jhazmat.2009.05.130

Cited by 13 publications

(9 citation statements)

References 26 publications

(25 reference statements)

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“…The benefit of using ultrasound, along with copper catalysed Fenton reactions, has also been described for degradation of 4-CP [55]. Degradation of 2,4-dichlorophenol using 489 kHz ultrasound was studied in the presence of oxygen, air, argon and nitrogen [58]. The rate of substrate removal increases markedly when argon or oxygen is present but is low with nitrogen saturation.…”

Section: Degradation Of Substituted Phenolsmentioning

confidence: 99%

The Chemistry of Ultrasonic Degradation of Organic Compounds

Bremner

Burgess²,

Chand

2011

COC

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The destruction of toxic organic molecules using advanced oxidation processes (AOPs) is a potent tool for pollution control and environmental protection. Ultrasound is a convenient and effective method of generating hydroxyl radicals which is the key oxidant in AOPs. This review describes the use of ultrasound and associated chemical reactions, with and without additives, as a powerful means of remediating water contaminated with organic pollutants. After a brief introduction to ultrasound and sonochemistry, their application for the oxidation of polycyclic aromatic hydrocarbons, phenol and substituted phenols is considered. Next is the decomposition of chlorinated phenols, and other chlorinated organics, then removal of recalcitrant smaller organic molecules. A discussion follows of recent work that has investigated the effects of initial concentration of substrates; the use of different ultrasonic frequencies; the inclusion of oxidising species, inorganic particles, or salts and their contribution to enhanced degradation. Finally, brief comments are made on the status of ultrasound as an AOP treatment.

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Section: Degradation Of Substituted Phenolsmentioning

confidence: 99%

The Chemistry of Ultrasonic Degradation of Organic Compounds

Bremner

Burgess²,

Chand

2011

COC

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“…The generation of ˙H atoms and ˙OH radicals from sonolysis of water (eqn(1)) is the primary step for the formation of hydrogen peroxide as well as nitrate and nitrite which are the most stable ROS and RNS in UAW, respectively. 28,29 It has been widely demonstrated that the nature of dissolved gases, including abundant gases 30–32 and rare gases, 33–35 significantly influences the sonochemical activity; however, their effect remains somewhat controversial. 36,37 Many researchers have reported that argon is more favourable than oxygen for the generation of free radicals due to its higher polytropic ratio, lower thermal conductivities, and higher solubility, resulting in a higher collapse temperature and generating more nucleation sites, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…30,42,43 Besides, this simulation work also demonstrated an unreasonably higher sonochemical activity in the presence of nitrogen compared to those of argon which is inconsistent with all experimental findings. 25,31,41…”

Section: Introductionmentioning

confidence: 99%

Optimizing dissolved gas composition in a double-bath-type sonoreactor for efficient production of ultrasonic-activated water with stable oxygen and nitrogen reactive species

Le,

Nguyen,

Duong

et al. 2023

React. Chem. Eng.

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“…Uddin et al . compared various dissolved gases in sonolysis of 2,4‐dichlorophenol, and they found that the degradation rate increased significantly in the presence of O 2 and argon, whereas it remained its lowest value under nitrogen condition .…”

Section: Introductionmentioning

confidence: 99%

“…Yanagida et al studied ultrasound degassing and found dissolved gas concentration as an important parameter in the initial growth stage [24]. Uddin et al compared various dissolved gases in sonolysis of 2,4dichlorophenol, and they found that the degradation rate increased significantly in the presence of O 2 and argon, whereas it remained its lowest value under nitrogen condition [25].…”

Section: Introductionmentioning

confidence: 99%

Direct conversion of syngas to DME over CuO-ZnO-Al₂O₃/HZSM-5 nanocatalyst synthesized via ultrasound-assisted co-precipitation method: New insights into the role of gas injection

Allahyari

Haghighi

Ebadi

et al. 2014

Int. J. Energy Res.

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SUMMARYIn this study, direct synthesis of dimethyl ether (DME) is conducted over a bifunctional CuO-ZnO-Al 2 O 3 /H Zeolite Socony Mobil-5 (HZSM-5) nanocatalyst. A hybrid method of ultrasound-assisted co-precipitation is used for the synthesis of catalysts, and the effect of gas injection during sonication is investigated. The physicochemical characteristics of the catalysts are analysed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), particle size distribution (PSD), energy dispersive X-ray (EDX), Brunauer-Emmett-Teller (BET) and Fourier-transformed infrared (FTIR) methods. In the absence of gas injection, the acetate-based catalysts have a better morphology and higher surface area than the nitrate-based catalyst. Gas injection significantly changes the morphology and structural properties of the acetate-based catalyst. High surface area, narrow PSD and better dispersion of small CuO crystals are obtained in a gas-injected synthesized sample. DME synthesis experiments showed that the CO conversion and DME selectivity are correlated with surface area, nanocatalyst particle size and its dispersion. The gas-injected CuO-ZnO-Al 2 O 3 /HZSM-5 nanocatalyst that has the highest surface area and the smallest dispersed particles showed more than 70% DME selectivity. The gas-injected CuO-ZnO-Al 2 O 3 /HZSM-5 nanocatalyst exhibited high stability in terms of CO conversion and DME yield over 1440-min time on a stream test at 275°C, 40 bar and 18 000 cm 3 g.h À1 .

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Effects of dissolved gases and pH on sonolysis of 2,4-dichlorophenol

Cited by 13 publications

References 26 publications

The Chemistry of Ultrasonic Degradation of Organic Compounds

The Chemistry of Ultrasonic Degradation of Organic Compounds

Optimizing dissolved gas composition in a double-bath-type sonoreactor for efficient production of ultrasonic-activated water with stable oxygen and nitrogen reactive species

Direct conversion of syngas to DME over CuO-ZnO-Al₂O₃/HZSM-5 nanocatalyst synthesized via ultrasound-assisted co-precipitation method: New insights into the role of gas injection

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Effects of dissolved gases and pH on sonolysis of 2,4-dichlorophenol

Cited by 13 publications

References 26 publications

The Chemistry of Ultrasonic Degradation of Organic Compounds

The Chemistry of Ultrasonic Degradation of Organic Compounds

Optimizing dissolved gas composition in a double-bath-type sonoreactor for efficient production of ultrasonic-activated water with stable oxygen and nitrogen reactive species

Direct conversion of syngas to DME over CuO-ZnO-Al2O3/HZSM-5 nanocatalyst synthesized via ultrasound-assisted co-precipitation method: New insights into the role of gas injection

Contact Info

Product

Resources

About

Direct conversion of syngas to DME over CuO-ZnO-Al₂O₃/HZSM-5 nanocatalyst synthesized via ultrasound-assisted co-precipitation method: New insights into the role of gas injection