| Abstract | A new supported catalyst composed of a nanostructured TiO2 film deposited on a stainless steel mesh (nanoTiO2-SS) using the Metal Organic Chemical Vapour Deposition (MOCVD) technique was evaluated for the photocatalytic degradation of a mixture of contaminants of emerging concern. Results showed that under the tested oxidative conditions tested, the nanoTiO2-SS catalyst demonstrated an efficiency in degrading the target contaminants higher than that observed under direct photolysis and photocatalysis using the conventional TiO2 Degussa P25 catalyst at the same amount of TiO2 participating to the photocatalysis. Specifically, the rate of removal of warfarin and trimethoprim obtained with the new catalyst was found twice the one observed by using TiO2 Degussa P25 and approximately 1.6 times faster for metoprolol, carbamazepine and gemfibrozil. An evaluation of the electrical energy per order magnitude of removal (EE/O) confirmed the enhanced performance of the new catalyst (24.3-31.8 kWh m-3 rather than 32.8-39.3 kWh m-3 for conventional TiO2) and that the performance is compound-dependent. Toxicity testing revealed that some assays are suitable for the investigation of bioactivity of treated waters containing contaminants of emerging concern at µg L-1 level. Specifically, the AMES Fluctuation Test, Fish Embryo Acute Toxicity Test and Green alga Selenastrum capricornutum test provided valuable results for an environmental impact assessment. On the other hand, the Daphnia magna and Vibrio fischeri acute toxicity tests were not sensitive enough to detect bioactivity in the samples analysed without prior pre-concentration. |
| Text | 359858 2017 10.1016/j.cej.2016.05.125 Scopus 2 s2.0 84973571940 ISI Web of Science WOS 000399851600013 TiO2 based nanostructured catalyst Contaminants of Emerging Concern Electrical Energy per Order Photocatalysis Toxicity Transformation Products. A new supported TiO2 film deposited on stainless steel for the photocatalytic degradation of contaminants of emerging concern Murgolo S.; Yargeau V.; Gerbasi R.; Visentin F.; El Habra N.; Ricco G.; Lacchetti I.; Carere M.; Curri M.L.; Mascolo G. 1,10 CNR, Water Research Institute, Via F. De Blasio 5, Bari, Italy 2 McGill University, Department of Chemical Engineering, University Street, Montreal, Quebec, Canada 3 5 CNR, Institute of Condensed Matter Chemistry and Energy Technologies, Corso Stati Uniti 4, Padova, Italy 6 Regional Environmental Protection Agency, Via Oberdan 16, Bari, Italy 7,8 National Institute of Health, Department of Environment and Primary Prevent Unit Soil and Waste, Viale Regina Elena 299, Rome, Italy 7 CNR, Water Research Institute, Area della Ricerca RM1, Monterotondo Rome , Italy 9 CNR, Institute for Physical and Chemical Processes, Via Orabona 4, Bari, Italy A new supported catalyst composed of a nanostructured TiO2 film deposited on a stainless steel mesh nanoTiO2 SS using the Metal Organic Chemical Vapour Deposition MOCVD technique was evaluated for the photocatalytic degradation of a mixture of contaminants of emerging concern. Results showed that under the tested oxidative conditions tested, the nanoTiO2 SS catalyst demonstrated an efficiency in degrading the target contaminants higher than that observed under direct photolysis and photocatalysis using the conventional TiO2 Degussa P25 catalyst at the same amount of TiO2 participating to the photocatalysis. Specifically, the rate of removal of warfarin and trimethoprim obtained with the new catalyst was found twice the one observed by using TiO2 Degussa P25 and approximately 1.6 times faster for metoprolol, carbamazepine and gemfibrozil. An evaluation of the electrical energy per order magnitude of removal EE/O confirmed the enhanced performance of the new catalyst 24.3 31.8 kWh m 3 rather than 32.8 39.3 kWh m 3 for conventional TiO2 and that the performance is compound dependent. Toxicity testing revealed that some assays are suitable for the investigation of bioactivity of treated waters containing contaminants of emerging concern at µg L 1 level. Specifically, the AMES Fluctuation Test, Fish Embryo Acute Toxicity Test and Green alga Selenastrum capricornutum test provided valuable results for an environmental impact assessment. On the other hand, the Daphnia magna and Vibrio fischeri acute toxicity tests were not sensitive enough to detect bioactivity in the samples analysed without prior pre concentration. 318 Preprint http //www.sciencedirect.com/science/article/pii/S1385894716307744 Highlights o A new nanostructured TiO2 film deposited on a stainless steel mesh was prepared. o The new supported photocatalyst was successfully reused several times. o Identified by products revealed minor differences between photocatalytic processes. o Toxicity tests showed that few of them are useful for investigating CECs degradation. A new supported TiO2 film deposited on stainless steel for the photocatalytic degradation of contaminants of emerging concern versione pubblicata Editore Elsevier Sequoia Lausanne ChemEngJ_318_103_2017.pdf A new supported TiO2 film deposited on stainless steel for the photocatalytic degradation of contaminants of emerging concern preprint 359858_Peolple_preprint.pdf Articolo in rivista Elsevier Sequoia 1385 8947 Chemical engineering journal Print Chemical engineering journal Print Chem. eng. j. Print Chemical engineering journal. Print francesca.visentin VISENTIN FRANCESCA sapia.murgolo MURGOLO SAPIA LACCHETTI INES marialucia.curri CURRI MARIA LUCIA rosalba.gerbasi GERBASI ROSALBA naida.elhabra EL HABRA NAIDA giuseppe.mascolo MASCOLO GIUSEPPE |
