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Degradation of endocrine disruptor bisphenol A by ultrasound-assisted electrochemical oxidation in water

 
: Dietrich, Matz; Franke, Marcus; Stelter, Michael; Bräutigam, Patrick

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Ultrasonics sonochemistry 39 (2017), pp.741-749
ISSN: 1350-4177
ISSN: 1873-2828
English
Journal Article
Fraunhofer IKTS ()
Sonoelectrochemistry; Bisphenol A; advanced oxidation process; synergistic effect; Sonochemiluminescence

Abstract
Micropollutants are becoming an increasing problem for the environment and wastewater treatment. One example is Bisphenol A (BPA), an endocrinic disruptor, which is widely used in plastic production. Due to its endocrine disrupting effects on aquatic (micro-)organisms and it subiquity, in surface- and wastewater alike, adequate treatment techniques are necessary. In this study, the degradation of BPA by a sonoelectrochemical hybrid system was investigated, using a low frequency (24 kHz) ultrasound horn and two boron doped diamond electrodes. It was found that by the combination of the individual processes, i.e. ultrasound and electrochemical oxidation, more than 90% of BPA could be removed within 30 min at an initial concentration of 1 mg L−1. Moreover, synergistic effects were discovered and a considerable improvement compared to the individual processes could be achieved by using a potential of 5 V, whereas synergistic effects were absent at a potential of 10 V. This study provides investigation of ultrasound amplitude, potential and electrode positioning on BPA degradation. The reaction was found to follow pseudo first order kinetics with a rate constant of 0.089 min−1. Samples were analysed by high pressure liquid chromatography (HPLC) using a diode array detector. Moreover, the presence and distribution of hydroxyl radicals within the reactor was visualized by using sonochemiluminescence.

: http://publica.fraunhofer.de/documents/N-452676.html