Ultrasound enhanced electrochemical oxidation of phenol and phthalic acid on boron-doped diamond electrode

Zhao, Guohua; Gao, Junxia; Shen, Shihao; Liu, Meichuan; Li, Dongming; Wu, Meifen; Lei, Yanzhu

doi:10.1016/j.jhazmat.2009.07.113

Cited by 43 publications

(12 citation statements)

References 26 publications

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“…It should be emphasized at this point that ultrasonic irradiation does not always enhance the electrochemical oxidation of pollutants at the anode. For example, Zhao et al recently observed that the electrochemical oxidation of phthalic acid on sonicated BDD electrodes led to poor efficiencies compared to silent conditions due to enhanced adsorption of materials at the electrode surface under insonation [40]. Electrochemical oxidation processes at the electrode surface are complex, and may undoubtedly involve the following steps: (i) mass transport -the diffusion of pollutants from the bulk solution to the electrode surface; (ii) adsorption or/and desorption -the adsorption of pollutants near the electrode to the electrode surface and desorption of intermediates from the electrode surface; and (iii) electrochemical reaction, that is, electron transfer.…”

Section: Sonoelectrochemical Degradation Of Aromatic and Phenolic Dermentioning

confidence: 99%

Sonoelectrochemistry in Environmental Applications

Ferrández

Esclapez

Bernal

et al. 2012

Power Ultrasound in Electrochemistry

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Section: Sonoelectrochemical Degradation Of Aromatic and Phenolic Dermentioning

confidence: 99%

Sonoelectrochemistry in Environmental Applications

Ferrández

Esclapez

Bernal

et al. 2012

Power Ultrasound in Electrochemistry

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“…Domestic and foreign scholars mainly applied ultrasonic electrochemical oxidation to wastewater treatment. For example, Zhao Guohua [13] from Tongji University combined boron doped electrode with ultrasound to treat phenol and phthalic acid. The results showed that hydroxyl radical produced during electrolytic process under ultrasonic environment.…”

Section: Introductionmentioning

confidence: 99%

Studies on the preparation of Caro’s acid by ultrasonic enhanced electrochemistry

Hong

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Ultrasonic cavitation effects can generate hydroxyl radicals and high energy, which is widely applied in the field of oxidation currently. Ultrasound-enhanced electrochemical is used to prepare Caro's acid, which improves the generate rate of Caro's acid. In this article, the influences of ultrasonic frequency and ultrasonic power on the electrolysis voltage, electrolyte temperature, electrolyte concentration and the concentration of additive in the process of electrochemical preparation of Caro's acid was studied. And the optimal production conditions were determined. The research results showed that ultrasonic can significantly improve the production of Caro's acid and the product can increase by about 20 g/L under the best condition. IntroductionThe study on ultrasonic-induced electrochemical reactions has developed rapidly, which was widely used in water treatment [1-2], ore decomposition [3], electroplating [4] and preparation of nanomaterials [5][6][7][8] and other fields currently. Zhuping [9] and her co-workers had studied treatment of nonleaching refractory gold ores with electrochemical antioxidant under two conditions including ultrasonic and ultrasonic condition. The results showed that ultrasound can reduce the reaction time and increase leaching rate by 35.84%.Electrolytic oxidation technology [10][11], which is a green and efficient chemical process, is widely used in wastewater treatment [12].with the aid of ultrasonic; the electrochemical process can enhance the mass transfer process, reduce the electrolytic voltage and reduce the energy consumption in ultrasonic environment. Moreover, ultrasonic cavitation can produce a micro environment of high temperature and high pressure, which can produce a lot of hydroxyl radicals with high oxidizing ability and improve oxidation efficiency. Domestic and foreign scholars mainly applied ultrasonic electrochemical oxidation to wastewater treatment. For example, Zhao Guohua [13] from Tongji University combined boron doped electrode with ultrasound to treat phenol and phthalic acid. The results showed that hydroxyl radical produced during electrolytic process under ultrasonic environment. Furthermore, the oxidation capacity increased and the oxidation peak increased by 32%, the degradation efficiency was significantly improved. Meanwhile the energy consumption was greatly reduced.In this study, ultrasonic chemical and electrochemical were combined together for the preparation of Caro's acid in a low concentration of sulfuric acid. The results indicated that the anode oxidation rate, current efficiency and mass transfer rate were improved greatly with a reduced energy consumption.

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“…The conventional disposal methods applied for the removal of phenolic compounds are generally not satisfactory due to the higher stability of phenolic compounds. In recent years, many advanced treatment schemes such as cavitation (ultrasonic cavitation and hydrodynamic cavitation) [3][4][5], photocatalysis [6], Fenton [7], photo-Fenton [8], wetair oxidation [9], electrochemical oxidation [10], and ozonation [11] as well as the combined treatments based on different oxidation schemes [12][13][14][15][16][17][18] have been applied for the degradation of phenolic pollutants in waste water. Besides these methods, microwave (MW) irradiation can also be effective giving localized higher energy densities and uniform intense heating [19].…”

Section: Introductionmentioning

confidence: 99%