Tannic acid- and natural organic matter-coated magnetite as green Fenton-like catalysts for the removal of water pollutants
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The use of magnetic materials as heterogeneous catalysts has attracted increasing attention in the last years since they proved to be promising candidates for water treatment. In the present study, two types of surface-modified magnetite (Fe3O4) nanoparticles, coated with non-hazardous naturally occurring agents—either tannic acid (TA) or dissolved natural organic matter—were evaluated as magnetic heterogeneous catalysts. Chemical synthesis (co-precipitation) was chosen to yield the nanocatalysts due to its well-established simplicity and efficiency. Subsequently, the properties of the final products were fully assessed by various characterization techniques. The catalytic activity in heterogeneous oxidation of aqueous solutions containing a model pollutant, Bisphenol A (BPA), was comparatively studied. The effect of operational parameters (catalyst loading, H2O2 dosage, and UV light irradiation) on the degradation performance of the oxidation process was investigated. The optimum experimental parameters were found to be 1.0 g/L of catalysts and 10 mM H2O2, under UV irradiation. The highest mineralization rates were observed for Fe3O4-TA catalyst. More than 80 % of BPA was removed after 30 min of reaction time under the specified experimental conditions. The obtained results showed that the two catalysts studied here are suitable candidates for the removal of pollutants in wastewaters by means of heterogeneous reaction using a green sustainable treatment method.
KeywordsNanocatalysts Characterization Photo-Fenton oxidation Wastewater Bisphenol A degradation Environment Mitigation
The authors acknowledge the financial support of the Romanian Ministry of National Education CNCS–UEFISCDI through the national grant PN-II-ID-PCE-2012-4-0477 and BAM Institute (Berlin, Germany). The authors also thank Dr. V. Nica for XRD analysis, Dr. P. Postolache for VSM measurements (Faculty of Physics, ‘Alexandru Ioan Cuza’ University in Iasi, Romania), and Prof. Dr. A. Pui (Faculty of Chemistry, ‘Alexandru Ioan Cuza’ University in Iasi, Romania) for the FTIR recordings.
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Conflict of Interest
The authors declare that they have no conflict of interest.
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