Sonocatalytic-TiO2 nanotube, Fenton, and CCl4 reactions for enhanced oxidation, and their applications to acetaminophen and naproxen degradation

Im, Jae Hyeng; Yoon, Jaekyung; Her, Namguk; Han, Jung-Geun; Zoh, Kyung-Duk; Yoon, Yeomin

doi:10.1016/j.seppur.2014.11.021

Cited by 64 publications

(16 citation statements)

References 48 publications

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“…The molecular forms mainly directed to the liquid bubble transfer region, where there is a high OH concentration. According to the studies, the accumulation of catalyst particles in the acidic solution decreases, resulting in an increase in the effective surface of the catalyst, which leads to an increase in the sonocatalytic degradation in acidic conditions (15,(23)(24)(25). Villaroel et al reported that in the degradation of acetaminophen by ultrasonic method, acidic medium (pH = 3-5.6) is more suitable, thus acetaminophen (PKa 9.5) in acidic solutions in molecular form could has a higher degradation (17).…”

Section: Discussionmentioning

confidence: 99%

Sonochemical degradation of azithromycin in aqueous solution

Yazdani

Sayadi

2018

Environ Health Eng Manag

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Background: The presence of pharmaceutical substances and their residual in water resources is an important environmental concern. Azithromycin, an antibiotic that is used for the treatment of infectious diseases, is a pollutant agent in the wastewater. The aim of this study was to investigate azithromycin degradation in aqueous solution through ultrasonic process in the presence of zinc oxide nanoparticles as catalysts. Methods: Sonocatalytic experiments were performed at variable conditions including pH (3-8), temperature (20-60°C), time (3-21 minutes), catalyst dosage (0.25-2 g/L), hydrogen peroxide concentration (15-100 mg/L) and initial azithromycin concentration (10-100 mg/L). Results: The optimum values for pH (3), temperature (40°C), time (15 minutes), catalyst dosage (1 g/L), H 2 O 2 concentration (50 mg/L) and initial azithromycin concentration (20 mg/L) were determined. The highest degradation efficiency of 98.4% was achieved after 15 minutes of ultrasonic irradiation under optimum condition. Conclusion: According to the results, ultrasonic irradiation is able to degrade azithromycin. In addition, ZnO and hydroxyl radical can successfully accelerate the reaction process in the shortest possible time.

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Section: Discussionmentioning

confidence: 99%

Sonochemical degradation of azithromycin in aqueous solution

Yazdani

Sayadi

2018

Environ Health Eng Manag

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“…It produces the reactive chlorine species in the liquid to cause faster degradation of the compound. The degradation efficiency of the technique is reduced by the addition of t-butanol, an efficient hydroxyl radical scavenger, and the maximum degradation was observed under acidic pH (Im et al 2015).…”

Section: Sonocatalysis and Sonophotocatalysismentioning

confidence: 99%

Degradation of pharmaceuticals by ultrasound-based advanced oxidation process

2016

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Water pollution by pharmaceutically active compounds is an emerging issue. Toxicological studies reveal that pharmaceuticals are indeed toxic for living organisms. The lack of suitable treatment technology for the complete removal of pharmaceuticals is therefore a major challenge. Advanced oxidation processes are emerging removal techniques that have many advantages versus conventional technologies. Many studies indicate that advanced oxidation processes, either in single or in combination with other degradation techniques, can enhance the degradation of pharmaceuticals in aqueous solutions. Here, we review the degradation of pharmaceuticals by sonolysis, an oxidation processes using ultrasound. In this technique, hydroxyl radicals are generated by pyrolytic cleavage of water molecules. We review the influence of operational parameters, additives and hybrid techniques on the degradation of pharmaceuticals. The maximum degradation of organic compounds was observed in the frequency range of 100-1000 kHz, which is in the high-frequency medium-power ultrasound. Even though almost all the experiments presented more than 90 % removal and good biodegradability of the target compound, good mineralization and the toxicity removal were hardly achieved. The efficiency of the degradation varies with water matrixes and varying pH. Major pathways of degradation are hydroxylation, dehalogenation, demethylation, decarboxylation, deamination, etc. More hybrid techniques have to be developed to scale up the application of ultrasound.

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“…The ''hot spot'' and ''sonoluminescence'' mechanisms can explain the enhanced decolorization of MB over ZnO nanostructures in comparison with the ultrasound alone. The ''hot spot'' phenomenon as a result of ultrasonic irradiation in water enhances the formation of OH Å in the solution due to the pyrolysis of water molecules as follows [5,9,24,26]:…”

Section: The Contribution Of Each Process Involved In the Sonocatalysismentioning

confidence: 99%

“…Among different physicochemical techniques, the application of advanced oxidation processes (AOPs) has gained much more attention due to the generation of one of the most powerful oxidants (OH Å , E°= 2.73 V) in adequate quantities to achieve the efficient degradation of the target pollutant [5,6]. In recent decade, the application of ultrasonic irradiation as an AOP has attracted much attention because of the generation of high amounts of OH Å radicals due to the ultrasonic cavitation [5][6][7][8]. The ultrasonic waves result in the rapid growth and subsequently, collapse of the cavitation bubbles, which produces extremely high pressure (up to 1800 atm) and temperature (as high as 5000 K) in the bubbles.…”

Section: Introductionmentioning

confidence: 99%

“…The ultrasonic waves result in the rapid growth and subsequently, collapse of the cavitation bubbles, which produces extremely high pressure (up to 1800 atm) and temperature (as high as 5000 K) in the bubbles. The high temperature, together with the high pressure, named ''hot spots'', leads to the generation of OH Å within the gas-liquid transition zone near the bubbles and bulk solution as a result of the water dissociation [5,8,9]. It has been demonstrated that the catalytically enhanced ultrasonic irradiation based on the application of semiconductors, known as sonocatalysis, has higher degradation efficiency and lower processing time than that of sonication alone [4,6,9,10].…”

Section: Introductionmentioning

confidence: 99%

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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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Sonocatalytic-TiO2 nanotube, Fenton, and CCl4 reactions for enhanced oxidation, and their applications to acetaminophen and naproxen degradation

Cited by 64 publications

References 48 publications

Sonochemical degradation of azithromycin in aqueous solution

Sonochemical degradation of azithromycin in aqueous solution

Degradation of pharmaceuticals by ultrasound-based advanced oxidation process

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

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