Ozonation combined with ultrasound for the degradation of tetracycline in a rectangular air-lift reactor

Wang, Yan; Zhang, Hui; Lu, Chunmei; Wang, Sheng; Zhang, Daobin

doi:10.1016/j.seppur.2011.06.035

Cited by 95 publications

(33 citation statements)

References 50 publications

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“…The curve trend in Fig. 8b was almost the same as the trend discussed in the reference [24]. It can be observed from these spectra that before the photocatalytic oxidation, the absorption spectrum of Tc in water was characterized by one main band with the maximum absorption at 359 nm and the other band in the ultraviolet region located at 275 nm.…”

Section: Photocatalytic Activitysupporting

confidence: 75%

P-doped TiO2 with superior visible-light activity prepared by rapid microwave hydrothermal method

Niu

Pan

Kang

et al. 2014

Applied Surface Science

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Section: Photocatalytic Activitysupporting

confidence: 75%

P-doped TiO2 with superior visible-light activity prepared by rapid microwave hydrothermal method

Niu

Pan

Kang

et al. 2014

Applied Surface Science

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“…The hydrogen peroxide addition could enhance the rate of degradation. But it is found to be decreased with increase in the initial concentration of tetracycline and the presence of hydroxyl radical scavenger as in the previous cases (Wang et al 2012). The difference in the degradation was investigated with ozone, sonoozonolysis and sonocatalysis/ozonolysis.…”

Section: Sono-ozonolysismentioning

confidence: 77%

“…Similar mechanistic approach was adopted in the case of sulfadiazine during the sonocatalytic degradation and also in the presence of chloride ion (Zou et al 2014(Zou et al , 2016. In the case of degradation of tetracycline from the catalytic ozonation in the presence of ultrasound, it is proposed that the compound can be degraded both by ozone and by free radicals (Wang et al 2011(Wang et al , 2012.…”

Section: Sonoelectrochemical Methodsmentioning

confidence: 99%

“…In order to make it energetically more efficient and more applicable, hybrid techniques between sonolysis and other advanced oxidation processes were developed. The major oxidation processes in combination with this category are ozonolysis and photocatalysis (Wang et al 2012). Recently, the electrochemical treatment technologies are also reported in combination with ultrasound (Adewuyi 2005a;Thokchom et al 2015b).…”

Section: Combination Of Sonolysis With Other Advanced Oxidation Procementioning

confidence: 99%

“…The fast degradation of tetracycline was observed in the case of ozonolysis and with the addition of catalyst in addition to the ozone (Wang et al 2011(Wang et al , 2012. The catalyst employed was goethite.…”

Section: Sono-ozonolysismentioning

confidence: 99%

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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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Investigations on the degradation of an antibiotic Cephalexin using suspended and supported TiO₂: Mineralization and durability studies

et al. 2016

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Rising levels of antibiotics in treated wastewater pose a great threat to human health worldwide. The present study shows degradation studies of antibiotic Cephalexin using slurry and innovative fixed‐bed photocatalysis under UVA (365 nm) irradiations. A UV‐spectrophotometer/HPLC was used for analyzing the decay of Cephalexin. Studies showed that variation in UV intensity, dose variation of TiO2 and H2O2, area by volume (A/V), and pH affect the degradation to a great extent. The degradation rate followed pseudo‐first order kinetics with optimized conditions for degrading the antibiotic being TiO2 1.0 g · L−1, H2O2 0.15 mL, with UV intensity of 25 W · m−2. The COD decrease (80 %) with the generation of nitrite, nitrate, and sulphate ions confirmed the mineralization of the selected compound. TiO2‐coated spherical cement beads were used for fixed‐bed studies, which eliminates the implications of slurry mode photocatalysis. The beads were recycled for at least 50 cycles, which confirmed the durability of the catalyst, and characterized by SEM‐EDAX. Attempts were made to study the pilot‐scale fixed‐bed baffled solar reactor for degrading Cephalexin, which confirmed 70 % degradation after 10 h.

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Ozonation combined with ultrasound for the degradation of tetracycline in a rectangular air-lift reactor

Cited by 95 publications

References 50 publications

P-doped TiO2 with superior visible-light activity prepared by rapid microwave hydrothermal method

P-doped TiO2 with superior visible-light activity prepared by rapid microwave hydrothermal method

Degradation of pharmaceuticals by ultrasound-based advanced oxidation process

Investigations on the degradation of an antibiotic Cephalexin using suspended and supported TiO₂: Mineralization and durability studies

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Ozonation combined with ultrasound for the degradation of tetracycline in a rectangular air-lift reactor

Cited by 95 publications

References 50 publications

P-doped TiO2 with superior visible-light activity prepared by rapid microwave hydrothermal method

P-doped TiO2 with superior visible-light activity prepared by rapid microwave hydrothermal method

Degradation of pharmaceuticals by ultrasound-based advanced oxidation process

Investigations on the degradation of an antibiotic Cephalexin using suspended and supported TiO2: Mineralization and durability studies

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Product

Resources

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Investigations on the degradation of an antibiotic Cephalexin using suspended and supported TiO₂: Mineralization and durability studies