Preyssler Heteropolyacid: A Green and Eco-friendly Catalyst in the Hydrothermal Synthesis of ZnO Nanostructures and their Applications in Photodegradation of Azo Dyes
Fatemeh F. Bamoharram, Sudabeh Hashemi, Majid M. Heravi, Hamed Rashidi and Ali Ayati
Affiliation: Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
ZnO nanostructures, including ZnO nano quasi-spheres and nanoplates, were synthesized hydrothermally, from
the reaction of zinc acetate, catalyzed by Preyssler type heteropolyacid (H14 [NaP5W30O110]), at 140°C in 48 and 72 hours,
respectively. The ZnO nanostructures were characterized using transmission electron microscopy (TEM), X-ray diffraction
(XRD), and Fourier transform infrared (FTIR) spectroscopy. The diameter of nano quasi-spheres, was about 5-10 nm.
The nano plates had hexagonal shape showing diameter of 40-60nm. Photocatalytic degradation of Methylene blue and
Congo red was effectively performed, using the above prepared ZnO nanostructures, achieving almost 70% decolorization,
in short time. First order reaction constants were evaluated as 0.0745 and 0.0746 for Methylene blue and Congo red
degradation reactions, respectively, concluding first order kinetics via this protocol.
Keywords: Azo dye, hydrothermal, photodegradation, preyssler, ZnO nano structure.
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