| Summary: | 博士 === 國立雲林科技大學 === 化學工程與材料工程系 === 104 === Mineralization of aniline in wastewater was performed using electro-activated persulfate/peroxymonosulfate oxidation assisted with ultrasonic irradiation.
Experiments were carried out under batch-wise mode to investigate the influence of various operation variables on the sonoelectrolytic behavior, such as ultrasonic power intensity, electrode potential employed, sonoelectrolytic temperature, persulfate anion concentration, acidity of wastewater and nitrogen/oxygen gas dosage.
Discussion on the organic pollutants of degradation efficiency, hydrogen peroxide (H2O2) generation amount and the plausible degradation pathway.
Moreover, it is remarkable that aniline pollutants into the reaction time of 12 hours could be nearly thoroughly 96% removed under the optimal conditions of ultrasonic power = 7U, E.P. = 6 V, T = 318 K, persulfate/peroxymonosulfate anion concentration = 2.5 wt%, pH = 3.0 and N2/O2 = 150 mL min-1.
It is notable that the aniline contaminants could be almost entirely eliminated by means of sonoelectro-activated persulfate/peroxymonosulfate oxidation, in which sulfate radicals served as principal oxidizing agents, of which amounts were significantly elevated with assistance of acoustic streams. Ethanol and tert-butyl alcohol were used as scavengers to clarify the reactive radicals.
Based on the results given by gas chromatograph–mass spectrometer (GC–MS), it was postulated that aniline preliminarily underwent oxidation to form iminobenzene radicals, followed to convert into azobenzene, nitrobenzene and nitrosobenzene respectively. Hydroquinone and p-benzoquinone were also detected as reaction intermediates.
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