Degradation of organic pollutants by heterogeneous electro-Fenton process using Mn-alginate composite

作者：Angeles Fernandez de Dios Maria; Rosales Emilio; Fernandez Fernandez Maria; Pazos Marta; Angeles Sanroman Maria

来源：Journal of Chemical Technology and Biotechnology, 2015, 90(8): 1439-1447.

DOI：10.1002/jctb.4446

• heterogeneous electro-Fenton
• di-2-ethylhexyl phthalate
• imidacloprid
• 4-nitrophenol
• Reactive Black 5

BACKGROUNDThe exploration of new technology based on electro-Fenton-like process has advantageous and unique environmental implications, however, scaling up to permit operation in continuous mode is a decisive stage to be researched.
RESULTSA new metal-organic composite, manganese-alginate (Mn-AB) was synthesized. It was characterized by scanning electron microscopy and the results showed that manganese was uniformly distributed on the surface of alginate beads. A comparative study of the decolorization of Reactive Black 5 demonstrated that the best performance was obtained by heterogeneous electro-Fenton using Mn-AB as catalyst. In addition, operation over four successive batches and continuous mode, showed high activity and stability of the catalyst Mn-AB without operational problems, and maintained particle shape throughout the oxidation process. The ability of Mn-AB catalyst for the degradation of other pollutants (imidacloprid, di-2-ethylhexyl phthalate, 4-nitrophenol) was confirmed by identification of several reaction intermediates using liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS).
CONCLUSIONThe efficiency of the new Fenton-like catalyst developed in this study was successfully demonstrated. Results validate an adequate heterogeneous electro-Fenton-like process to continuously remediate organic pollutants in aqueous medium.

• 出版日期2015-8