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Photocatalytic degradation of carbamazepine in wastewater by using a new class of whey-stabilized nanocrystalline TiO₂ and ZnO.

Mohapatra, Debabandya P.; Brar, Satinder Kaur; Daghrir, Rimeh; Tyagi, Rajeshwar Dayal; Picard, Pierre; Surampalli, Rao Y.; Drogui, Patrick (2014). Photocatalytic degradation of carbamazepine in wastewater by using a new class of whey-stabilized nanocrystalline TiO₂ and ZnO. Science of The Total Environment , vol. 485–48 . p. 263-269. DOI: 10.1016/j.scitotenv.2014.03.089.

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Résumé

Nanoscale photocatalysts have attracted much attention due to their high surface area to volume ratios. However, due to extremely high reactivity, TiO₂ and ZnO nanoparticles prepared using different methods tend to either react with surrounding media or agglomerate, resulting in the formation of much larger flocs and significant loss in reactivity. This work investigates the photocatalytic degradation of carbamazepine (CBZ), a persistent pharmaceutical compound from wastewater (WW) using TiO₂ and ZnO nanoparticles prepared in the presence of a water-soluble whey powder as stabilizer. The TiO₂ and ZnO nanoparticles prepared in the presence of whey stabilizer displayed much less agglomeration and greater degradation power than those prepared without a stabilizer. Higher photocatalytic degradation of carbamazepine was observed (100%) by using whey stabilized TiO₂ nanoparticles with 55 min irradiation time as compared to ZnO nanoparticles (92%). The higher degradation of CBZ in wastewater by using TiO₂ nanoparticles as compared to ZnO nanoparticles was due to formation of higher photo-generated holes with high oxidizing power of TiO₂. The photocatalytic capacity of ZnO anticipated as similar to that of TiO₂ as it has the same band gap energy (3.2 eV) as TiO₂. However, in the case of ZnO, photocorrosion frequently occurs with the illumination of UV light and this phenomenon is considered as one of the main reasons for the decrease of ZnO photocatalytic activity in aqueous solutions. Further, the estrogenic activity of photocatalyzed WW sample with CBZ and its by-products was carried out by yeast estrogen screen (YES) assay method. Based upon the YES test results, none of the samples showed estrogenic activity.

Type de document: Article
Mots-clés libres: carbamazepine; photocatalysis; yeast estrogen screen assay; whey stabilizer; wastewater
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 avr. 2018 13:25
Dernière modification: 12 avr. 2018 19:00
URI: http://espace.inrs.ca/id/eprint/3636

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