Sonochemical destruction of nonylphenol: Effects of pH and hydroxyl radical scavengers

Ince, Nilsun H.; Gültekin, Isil; Tezcanli‐Güyer, Gökce

doi:10.1016/j.jhazmat.2009.07.058

Cited by 48 publications

(14 citation statements)

References 31 publications

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“…Effects of water characteristics 3.1.1. Effect of the initial pH Solution pH can entail into structural modifications of organic compounds, the catalyst properties and the oxidative species formed leading to important changes during organic pollutant degradation (Hazime et al, 2012;Ince et al, 2009;Lopez-Alvarez et al, 2011). Consequently, toward a better selection of the AOP, it is crucial to evaluate the influence of initial pH.…”

Section: Resultsmentioning

confidence: 99%

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Villegas-Guzmán

Silva-Agredo

Flórez

et al. 2017

Journal of Environmental Management

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a b s t r a c tTo provide new insights toward the selection of the most suitable AOP for isoxazolyl penicillins elimination, the degradation of dicloxacillin, a isoxazolyl penicillin model, was studied using different advanced oxidation processes (AOPs): ultrasound (US), photo-Fenton (UV/H 2 O 2 /Fe 2þ ) and TiO 2 photocatalysis (UV/TiO 2 ). Although all processes achieved total removal of the antibiotic and antimicrobial activity, and increased the biodegradability level of the solutions, significant differences concerning the mineralization extend, the pH of the solution, the pollutant concentration and the chemical nature of additives were found. UV/TiO 2 reached almost complete mineralization; while~10% mineralization was obtained for UV/H 2 O 2 /Fe 2þ and practically zero for US. Effect of initial pH, mineral natural water and the presence of organic (glucose, 2-propanol and oxalic acid) were then investigated. UV/H 2 O 2 /Fe 2þ and US processes were improved in acidic media, while natural pH favored UV/TiO 2 system. According to both the nature of the added organic compound and the process, inhibition, no effect or enhancement of the degradation rate was observed. The degradation in natural mineral water showed contrasting results according to the antibiotic concentration: US process was enhanced at low concentration of dicloxacillin followed by detrimental effects at high substrate concentrations. A contrary effect was observed during photo-Fenton, while UV/TiO 2 was inhibited in all of cases. Finally, a schema illustrating the enhancement or inhibiting effects of water matrix is proposed as a tool for selecting the best process for isoxazolyl penicillins degradation.

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Section: Resultsmentioning

confidence: 99%

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Villegas-Guzmán

Silva-Agredo

Flórez

et al. 2017

Journal of Environmental Management

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“…In the case of carbonate ions, their addition to the solution resulted in a little increase in the color removal, increasing to 80.8%. The enhanced sonocatalysis of organic compounds in the presence of carbonate ions has been reported in the literature [36]. In addition to the above-mentioned reasons, the presence of ionic species such as carbonate and chloride could be led to increasing the ionic strength of the bulk solution, which pushes the dye molecules from the bulk solution toward the bulk-bubble interface [37].…”

Section: àmentioning

confidence: 97%

Ultrasonically induced ZnO–biosilica nanocomposite for degradation of a textile dye in aqueous phase

Soltani

Jorfi

Ramezani

et al. 2016

Ultrasonics Sonochemistry

123

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In the present study, a porous clay-like support with unique characteristics was used for the synthesis and immobilization of ZnO nanostructures to be used as sonocatalyst for the sonocatalytic decolorization of methylene blue (MB) dye in the aqueous phase. As a result, the sonocatalytic activity of ZnO-biosilica nanocomposite (77.8%) was higher than that of pure ZnO nanostructures (53.6%). Increasing the initial pH from 3 to 10 led to increasing the color removal from 41.8% to 88.2%, respectively. Increasing the sonocatalyst dosage from 0.5 to 2.5 g/L resulted in increasing the color removal, while further increase up to 3g/L caused an obvious drop in the color removal. The sonocatalysis of MB dye over ZnO-biosilica nanocomposite was temperature-dependent. The presence of methanol produced the most adverse effect on the sonocatalysis of MB dye. The addition of chloride and carbonate ions had a negligible effect on the sonocatalysis, while the addition of persulfate ion led to increasing the color removal from 77.8% to 99.4% during 90 min. The reusability test exhibited a 15% drop in the color removal (%) within three consecutive experimental runs. A mineralization efficiency of 63.2% was obtained within 4h.

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“…Over the past two decades, sonochemical degradation of organic pollutants in water has been extensively investigated as an advanced oxidation technology [1][2][3][4][5]. The chemical effects of sonication (namely sonochemistry) arise from acoustic cavitation, that is, the formation, growth and implosive collapse of tiny bubbles in a liquid irradiated by ultrasonic waves [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the effect of liquid temperature on the sonolytic degradation of some organic dyes in water

Merouani

Hamdaoui

Boutamine

et al. 2016

Ultrasonics Sonochemistry

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This paper presents a comprehensive experimental and numerical investigation of the effects of liquid temperature on the sonochemical degradation of three organic dyes, Rhodamine B (RhB), Acid orange 7 (AO7) and Malachite green (MG), largely used in the textile industry. The experiments have been carried out for an ultrasonic frequency of 300 kHz. The obtained experimental results were discussed using a new approach combining the results of single-bubble event and the number of active bubbles. The single-bubble event was predicted using a model that combines the bubble dynamics with chemical kinetics occurring inside a bubble during the strong collapse. The number of active bubbles was predicted using a method developed in our previous work. The experiments showed that the degradation rate of the three dyes increased significantly with increasing liquid temperature in the range 25-55°C. It was predicted that the main pathway of pollutants degradation is the attack by OH radicals. The simulations showed that there exists an optimum liquid temperature of about 35°C for the production of OH inside a bubble whereas the number of active bubbles increased sharply with the rise of the liquid temperature. It was predicted that the overall production rate of OH increased with increasing liquid temperature in the range 25-55°C. Finally, it was concluded that the effect of liquid temperature on the sonochemical degradation of the three dyes in aqueous phase was controlled by the number of active bubbles in the range 35-55°C and by both the number of bubbles and the single bubble yield in the range 25-35°C.

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Sonochemical destruction of nonylphenol: Effects of pH and hydroxyl radical scavengers

Cited by 48 publications

References 31 publications

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Ultrasonically induced ZnO–biosilica nanocomposite for degradation of a textile dye in aqueous phase

Experimental and numerical investigation of the effect of liquid temperature on the sonolytic degradation of some organic dyes in water

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