Degradation of trace concentrations of alachlor by medium frequency ultrasound

Kıdak, Rana; Doğan, Şifa

doi:10.1016/j.cep.2014.12.010

Cited by 16 publications

(9 citation statements)

References 12 publications

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“…In a study carried out by Kidak and Dogan [52], where the degradation of alachlor through the US process was evaluated, it was concluded that due to the physical properties of the compound, such as the water solubility limit (140 mg L −1 at 20 • C), vapor pressure (negligible), Henry's constant (3.2 × 10 −8 to 1.2 × 10 −10 atm-m 3 mol −1 ), octanol-water partition coefficient (Log K ow = 2.63-3.53) and its positive ionization, the compound was housed in the bubble-liquid interface, indicating that the degradation was due to the HO• recently formed from the implosion of the cavitation bubbles. The degradation obtained of the target compound was near 100% with a frequency of 575 kHz and an electrical power of 90 W.…”

Section: Reaction Zones-the Nature Of the Emerging Pollutantmentioning

confidence: 99%

“…In this sense, the optimal frequency is determined by the integral efficiency of the energy discharge, which depends on the quantity, size and lifetime of the bubbles. It is noteworthy to mention that the optimal frequency varies according to the different compound to be treated [52,59].…”

Section: Namementioning

confidence: 99%

“…Meanwhile, Kidak and Dogan [52] stated that increasing electrical power also increased the number of the bubbles formed, and that better results were expected in the degradation of the pollutants of interest. This assertion was supported by the results obtained in the experimentation with alachlor, where near 100% degradation was obtained through the US process (initial concentration of alachlor 100 µg L −1 , frequency of 575 kHz and powers of 45, 60 and 90 W).…”

Section: Electrical Powermentioning

confidence: 99%

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Use of Ultrasound as an Advanced Oxidation Process for the Degradation of Emerging Pollutants in Water

Camargo-Perea

Rubio-Clemente

Peñuela

2020

Water

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Emerging pollutants are compounds of increased environmental importance and, as such there is interest among researchers in the evaluation of their presence, continuity and elimination in different environmental matrices. The present work reviews the available scientific data on the degradation of emerging pollutants, mainly pharmaceuticals, through ultrasound, as an advanced oxidation process (AOP). This study analyzes the influence of several parameters, such as the nature of the pollutant, the ultrasonic frequency, the electrical power, the pH, the constituents of the matrix and the temperature of the solution on the efficiency of this AOP through researches previously reported in the literature. Additionally, it informs on the application of the referred process alone and/or in combination with other AOPs focusing on the treatment of domestic and industrial wastewaters containing emerging pollutants, mainly pharmaceuticals, as well as on the economic costs associated with and the future perspectives that make ultrasound a possible candidate to solve the problem of water pollution by these emerging pollutants.

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Section: Reaction Zones-the Nature Of the Emerging Pollutantmentioning

confidence: 99%

Section: Namementioning

confidence: 99%

Section: Electrical Powermentioning

confidence: 99%

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Use of Ultrasound as an Advanced Oxidation Process for the Degradation of Emerging Pollutants in Water

Camargo-Perea

Rubio-Clemente

Peñuela

2020

Water

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“…Hydroxyl radicals can also convert lipophilic into hydrophilic compounds. That is, from the structural point of view, the DP with m/z = 284 is more soluble in water than its parent compound due to an increased number of polar groups in its structure 6 . The subsequent demethylation followed by the addition of H + leads to the formation of another DP with m/z = 270 8, 51 .…”

Section: Electrochemical Degradation Of Atrazine and Alachlor-atrazinmentioning

confidence: 99%

“…Therefore, both alachlor and its main metabolite, 2,6diethylaniline, are ubiquitous in the environment and cause serious ecological and physiological problems 2,3 . Alachlor is a toxic, carcinogenic, persistent organic compound (with a half-life of 70 days in soil and 30 days in water), and an endocrine disruptor [4][5][6][7] . The contamination of water resources by alachlor occurs due to runoff and infiltration, causing it to be frequently detected in surface and groundwater samples 8- 10 .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical degradation of aqueous alachlor and atrazine: products identification, lipophilicity, and ecotoxicity

2019

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This work studied the electrochemical degradation of alachlor and atrazine (alone and mixed with each other) using a filter-press cell, a dimensionally stable anode (DSA Ti/Ru0.3Ti0.7O2), initial pH 3.0, and temperature at 25 °C. The best operational conditions for alachlor (0.33 mmol L-1) degradation were obtained by a 32 factorial design, in which the factors/levels were: NaCl concentration (0.05, 0.1, and 0.15 mol L-1) and current density (10, 30, and 50 mA cm-2). Thus, 93.1% alachlor removal and 71.2% mineralization were achieved using 0.15 mol L-1 NaCl and 30 mA cm-2. In addition, the initial degradation products (DPs) of alachlor and atrazine were identified by liquid chromatography coupled to mass spectrometry (LC-MS). Acute and chronic ecotoxicities for three trophic levels (fishes, daphnids and green algae) and lipophilicity (log D, pH 7.4) of the DPs were also estimated using the ECOSAR 1.11 and ChemAxon Calculator software, respectively. The present study showed that the electrochemical degradation is an efficient method for removing the herbicides alachlor and atrazine from water and that the DPs formed have lower pollution potential than their original compounds.

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Ultrasound as an Advanced Oxidative Process: A Review on Treating Pharmaceutical Compounds

2021

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Ultrasound treatment, among the various existing water and effluent treatment techniques, is considered an emerging method in recent years due to the degradation of complex organic and inorganic contaminants. It offers substantial advantages, such as cleanliness, safety, and minor or non‐existent secondary pollution products, when compared to other advanced oxidation processes (AOPs). A systematic review of the published peer‐reviewed literature relating the use of ultrasound as an AOP is provided based on theoretical concepts and factors that influence sonochemical reactions. The synergistic effects of ultrasound with other degradation technologies for the oxidation of medications are investigated and the importance of assessing toxicity and biodegradability for the treatment of water and effluents with emerging pollutants is evaluated. The mechanistic understanding of the sonochemical effects in drugs, classification of intermediates, and the development of new treatment technologies are still the subject of future research, however, the synergy of treatments and cavitation studies must be considered.

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Degradation of trace concentrations of alachlor by medium frequency ultrasound

Cited by 16 publications

References 12 publications

Use of Ultrasound as an Advanced Oxidation Process for the Degradation of Emerging Pollutants in Water

Use of Ultrasound as an Advanced Oxidation Process for the Degradation of Emerging Pollutants in Water

Electrochemical degradation of aqueous alachlor and atrazine: products identification, lipophilicity, and ecotoxicity

Ultrasound as an Advanced Oxidative Process: A Review on Treating Pharmaceutical Compounds

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