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- Title
Suspension of ZnO Nanostructures Synthesized by Hot Water Treatment for Photocatalytic Wastewater Treatment.
- Authors
Hariharalakshmanan, Ranjitha K.; Martinez, Juan; Ergul-Yilmaz, Busra; Karabacak, Tansel
- Abstract
In this study, zinc oxide (ZnO) nanostructures were synthesized using a simple and chemical additive-free hot water treatment (HWT) method for the photocatalytic degradation of methylene blue (MB). Zinc (Zn) plates were immersed in deionized (DI) water at 75 °C for 5 h, resulting in the formation of ZnO nanostructures on the Zn surface and a suspension of ZnO nanostructures in water. The nanostructures were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD), which showed the formation of crystalline and stoichiometric ZnO nanowires. We studied the effects of the ZnO nanostructure load, initial concentration, and pH of MB on its photocatalytic degradation under UV light. We found that a 25 mL of ZnO nanostructure suspension, MB concentration of 1 ppm (mg/L), and pH of 11 gave the best average photocatalytic degradation, most likely due to the optimum light absorption, surface charging, and ROS (·OH) generation by the ZnO nanostructures in these conditions. In addition, we investigated the formation of ZnO nanostructures in hot tap-water, and their morphology was not as well-developed as in DI-water. However, comparable MB degradation was observed, which is believed to be the combined effect of photocatalysis, and free radicals generated by photolysis of chlorine present in tap-water. Furthermore, the DI-water HWT ZnO nanostructures showed significant photocatalytic activity under a solar simulator. These results indicate that HWT has the potential to be an alternative method for the scalable, cost-effective, and environmentally friendly synthesis of ZnO nanostructures for photocatalytic wastewater treatment applications.
- Subjects
METHYLENE blue; WATER purification; WASTEWATER treatment; HOT water; ENERGY dispersive X-ray spectroscopy; ZINC oxide
- Publication
Water, Air & Soil Pollution, 2023, Vol 234, Issue 4, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-023-06192-0