Enhanced sonolytic mineralization of basic red 29 in water by integrated ultrasound/Fe2+/TiO2 treatment

Boutamine, Zineb; Hamdaoui, Oualid; Merouani, Slimane

doi:10.1007/s11164-016-2724-3

Cited by 20 publications

(8 citation statements)

References 47 publications

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“…As shown in figure 13, with the increase of treatment time, TOC decreased gradually, and the removal rate of TOC was 47.4% at 24 min. Boutamine et al [51] only used photocatalyst to degrade Basic Red 29, and the results showed that the mineralization of the dye is about 10.0%. In order to make sure the by-products were produced by the gas-liquid plasma, the possible degradation pathway of CIP in plasma was elucidated from the ESI (+)-MS.…”

Section: Spectrophotometry and Toc Analysis Of Cip Degradationmentioning

confidence: 99%

Degradation and mineralization of ciprofloxacin by gas–liquid discharge non-thermal plasma

Liu

2018

Plasma Sci. Technol.

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A typical quinolones antibiotic ciprofloxacin (CIP) in aqueous solution was degraded by a gasliquid discharge non-thermal plasma system. The discharge plasma power and the emission intensity of the excited reactive species (RS) generated in the gas phase were detected by the oscilloscope and the optical emission spectroscopy. The effects of various parameters on CIP degradation, i.e. input powers, initial concentrations addition of radical scavengers and pH values were investigated. With the increase of discharge power, the degradation efficiency increased but the energy efficiency significantly reduced. The degradation efficiency also reduced under high concentration of initial CIP conditions due to the competitive reactions between the plasma-induced RS with the degradation intermediates of CIP. Different radical scavengers (isopropanol and CCl 4 ) on •OH and H• were added into the reaction system and the oxidation effects of •OH radicals have been proved with high degradation capacity on CIP. Moreover, the long-term degradation effect on CIP in the plasma-treated aqueous solution proved that the long-lived RS (H 2 O 2 and O 3 , etc) might play key roles on the stay effect through multiple aqueous reactions leading to production of •OH. The degradation intermediates were determined by the method of electrospray ionization (+)-mass spectroscopy, and the possible degradation mechanism were presented.

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Section: Spectrophotometry and Toc Analysis Of Cip Degradationmentioning

confidence: 99%

Degradation and mineralization of ciprofloxacin by gas–liquid discharge non-thermal plasma

Liu

2018

Plasma Sci. Technol.

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“…Most works described the pollutant concentration decay as exponential and automatically used the pseudo-first order rate law. However, there was no linear relation between the initial contaminant concentration and the initial sonolytic degradation rate, in contrast to what a pseudo-first order kinetics law would predict [18] , [19] , [20] , [21] , [22] , [23] , [24] , [17] , [25] , [26] , [27] . Additionally, the determined rate constant varies with the initial contaminant concentration, demonstrating that sono-oxidation does not conform a pseudo-first order kinetics law.…”

Section: Introductionmentioning

confidence: 72%

Application of the general rate law model to the sonolytic degradation of nonvolatile organic pollutants in aqueous media

Hamdaoui,

Alghyamah

2023

Ultrasonics Sonochemistry

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“…These h + could oxidize water to generate ∙ OH directly and react with AO7. At the same time, cavitations may be formed, leading to the collapse of microbubbles under ultrasound irradiation; 32 extreme temperatures and pressures have been shown to exist in the cavitations (several thousands of Kelvin and several hundreds of atmospheres) 33 . Under these conditions, reactive substances such as ∙ OH, HO 2 ∙ and H 2 O 2 can be created from H 2 O and O 2 34 .…”

Section: Resultsmentioning

confidence: 99%

Hydrogen peroxide enhanced sonophotocatalytic degradation of acid orange 7 in aqueous solution: optimization by Box–Behnken design

Wei

Rahaman²,

Zhao

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Sonophotocatalysis has gained great attention for research into practical applications to treat refractory organic dye from wastewater. However, its degradation efficiency needs to be improved further. To further enhance the sonophotocatalytic performance, here we report a novel hydrogen peroxide (H2O2)‐assisted titania (TiO2)‐based sonophotocatalyic system (H2O2‐US‐UV/TiO2) for degradation of acid orange 7 (AO7). RESULTS Effects of operating parameters including catalyst dosage, concentration of the oxidative agents and initial pH were analyzed through a response surface method coupled with Box–Behnken experimental design (RSM‐BBD) and experiments. Introducing H2O2 into the US‐UV/TiO2 system can significantly enhance AO7 removal. A quadratic model was proposed for predicting AO7 degradation using the RSM‐BBD method, and the statistical significance of the model was confirmed by ANOVA. The real AO7 removal efficiency (95.8%) under experimental conditions of 0.5 g L−1 TiO2, 4 mmol L–1 H2O2, and initial pH 3 was comparable with the predicated value (98.6%) obtained from this model. Quenching tests revealed that the hydroxyl radical (˙OH) was the key reactive species in the sonophotocatalytic system. Degradation products including 2‐naphthol, 4‐carboxylphenylglycine, cinnamic acid and 1,10‐Decanediol were identified. CONCLUSION Adding H2O2 improved the degradation performance of AO7 in the US‐UV/TiO2 system; H2O2 concentration was a more significant experimental factor than initial pH and TiO2 dosage. A degradation pathway of AO7 removal was suggested according to results of liquid chromatography‐mass spectrometry. The novel hybrid H2O2‐US‐UV/TiO2 system can be utilized as an efficient process for recalcitrant dye wastewater treatment. © 2021 Society of Chemical Industry (SCI).

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Enhanced sonolytic mineralization of basic red 29 in water by integrated ultrasound/Fe2+/TiO2 treatment

Cited by 20 publications

References 47 publications

Degradation and mineralization of ciprofloxacin by gas–liquid discharge non-thermal plasma

Degradation and mineralization of ciprofloxacin by gas–liquid discharge non-thermal plasma

Application of the general rate law model to the sonolytic degradation of nonvolatile organic pollutants in aqueous media

Hydrogen peroxide enhanced sonophotocatalytic degradation of acid orange 7 in aqueous solution: optimization by Box–Behnken design

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