Natural dye-sensitized ZnO nano-particles as photo-catalysts in complete degradation of E. coli bacteria and their organic content

Autor: Maher Kharoof, Amani Zu’bi, DaeHoon Park, Samar Al-Shakhshir, Guy Campet, Jumana Shteiwi, Hansang Kwon, Majdi Dwikat, Ramzi Shawahna, Sondos Ateeq, Ahed Zyoud, Muath Helal, Tae Woo Kim, Hikmat S. Hilal
Přispěvatelé: Department of Chemistry, An-Najah National University, Clinical Biology Laboratory, College of Pharmacy and Nutrition, University of Saskatchewan [Saskatoon] (U of S), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Dansuk Industrial Co., Department of Materials System Engineering, Pukyong National University, Energy Materials Laboratory, Korea Institute of Energy Research, Jerusalem Pharmaceutical Co., Department of Physiology, Pharmacology and Toxicology, the Research and Development Program of the Korea Institute of Energy Research (B6-2523)
Rok vydání: 2016
Předmět:
Zdroj: Journal of Photochemistry and Photobiology A: Chemistry
Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2016, 328, pp.207-216. ⟨10.1016/j.jphotochem.2016.05.020⟩
ISSN: 1010-6030
Popis: International audience; This communication describes for the first time how nano-size particles, sensitized with natural dye molecules of anthocyanin, can be used as catalysts in photo-degradation of gram negative Escherichia coli bacteria in water. The naked ZnO nano-particles degraded up to 83% of the bacteria under solar simulator light, while the dye-sensitized particles increased the bacterial loss by ∼10%. Solar simulator light includes about 5% of UV tail (shorter than 400 nm) which means that both UV and visible light (longer than 400 nm) radiations could be involved. When a cut-off filter was used, the naked ZnO caused only 40% bacterial loss, in accordance with earlier literature that described killing of bacteria with ZnO particles both in the dark and under light. With the cut-off filter, the sensitized ZnO particles caused higher than 90% bacterial loss, which confirms sensitization of the ZnO particles to visible light. Moreover, the results show that the catalyzed photo-degradation process causes mineralization of the bacteria and their organic internal components which leach out by killing. The catalyst can be recovered and reused losing ∼10% of its activity each time due to mineralization of the dye molecules. However, catalyst activity can be totally regained by re-sensitizing it with the anthocyanin dye. The effects of different experimental conditions, such as reaction temperature, pH, bacterial concentration and catalyst amount together with nutrient broth and saline media, will be discussed together with the role of the sensitizer.
Databáze: OpenAIRE
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