Hydrothermal modification of zinc oxide and titanium dioxide for photocatalytic degradation of Rhodamine B

Hydrothermal modification of zinc oxide and titanium dioxide for photocatalytic degradation of Rhodamine B

Zinc oxide (ZnO) and titanium dioxide (TiO2) powders were hydrothermally modified in 10 M sodium hydroxide solutions at 120 °C for 24 hours to alter its morphologies. Hydrothermally treated ZnO and TiO2 showed partially rod-shaped particles and used as catalysts in the photocatalytic degradation of...

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Bibliographic Details
Main Authors: Wai, Kok Poh, Pang, Yean Ling, Lim, Steven, Koo, Chai Hoon, Chong, Woon Chan
Format: Conference Proceeding
Language:eng
Subjects:
Catalysis
Catalysts
Catalytic activity
Dyes
Holes (electron deficiencies)
Hydrogen peroxide
Morphology
Photocatalysis
Photodegradation
Pollutants
Rhodamine
Sodium hydroxide
Titanium
Titanium dioxide
Wastewater
Zinc oxide
Zinc oxides
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Summary:Zinc oxide (ZnO) and titanium dioxide (TiO2) powders were hydrothermally modified in 10 M sodium hydroxide solutions at 120 °C for 24 hours to alter its morphologies. Hydrothermally treated ZnO and TiO2 showed partially rod-shaped particles and used as catalysts in the photocatalytic degradation of Rhodamine B under UV illumination. The effect of operational parameters on degradation efficiency such as catalyst loading (0.5 g/L to 2.5 g/L), initial dye concentration (2.5 ppm to 12.5 ppm), initial H2O2 concentration (0.1 M to 4.0 M) and solution pH (3 to 11) were studied. ZnO showed better photocatalytic activity as compared to TiO2 because ZnO has a lower bandgap energy and more active electron-hole pairs formation in the system. The optimum conditions were 0.5 M H2O2, 1.5 g/L ZnO suspension and 7.5 ppm Rhodamine B at neutral solution pH. The degradation of Rhodamine B followed pseudo first order reaction, with the apparent rate of reaction, kapp = 0.0501 min−1. An effective, efficient and environmental friendly method to remove organic dye from wastewater was developed and could be implemented in treating various types of organic pollutants.
ISSN:0094-243X
1551-7616