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AbstractAbstract
[en] Materials based on pure iron oxide and impregnated with niobia (Nb2O5) were prepared. Their catalytic activities were tested on the oxidation of compounds present in the wastewater from the processing of coffee berries. Particularly caffeine and catechol were tested. The oxidation reactions were carried out with the following systems: UV/H2O2; photo-Fenton and heterogeneous Fenton. All materials were characterized with X-ray diffraction, Moessbauer and infrared spectroscopy. Iron was mainly in the forms of goethite and maghemite. The oxidation kinetics were monitored by UV-vis and the oxidation products were monitored by mass spectrometry. The photo-Fenton reaction presented highest oxidation efficiency, removing 98% of all caffeine and catechol contents. (author)
Original Title
Materiais a base de oxido de ferro para oxidacao de compostos presentes no efluente da despolpa do cafe
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Also available from http://www.scielo.br/pdf/qn/v31n7/v31n7a07.pdf; 17 refs., 8 figs., 1 tab.
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Journal Article
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AROMATICS, BETA DECAY RADIOISOTOPES, CHALCOGENIDES, CHEMICAL REACTIONS, COBALT ISOTOPES, COHERENT SCATTERING, DAYS LIVING RADIOISOTOPES, DEVELOPERS, DIFFRACTION, ELECTRON CAPTURE RADIOISOTOPES, HYDROGEN COMPOUNDS, HYDROXY COMPOUNDS, INTERMEDIATE MASS NUCLEI, IRON COMPOUNDS, ISOTOPES, MAGNOLIOPHYTA, MAGNOLIOPSIDA, MINERALS, NIOBIUM COMPOUNDS, NUCLEI, ODD-EVEN NUCLEI, ORGANIC COMPOUNDS, OXIDE MINERALS, OXIDES, OXYGEN COMPOUNDS, PEROXIDES, PHENOLS, PLANTS, POLYPHENOLS, RADIOISOTOPES, REFRACTORY METAL COMPOUNDS, SCATTERING, SPECTRA, TRANSITION ELEMENT COMPOUNDS
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