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Open AccessArticle

Synthesis and Characterization of Ag-Ag2O/TiO2@polypyrrole Heterojunction for Enhanced Photocatalytic Degradation of Methylene Blue

Department of Environmental Sciences, Faculty of Meteorology, Environment, and Arid Land Agriculture, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, Saudi Arabia
Dyeing, Printing and Textile Auxiliaries Department, Textile Research Division, National Research Center, Dokki, Giza 12311, Egypt
Central Metallurgical R & D Institute, Helwan 11421, Cairo, Egypt
Author to whom correspondence should be addressed.
Academic Editor: Dionysios (Dion) D. Dionysiou
Catalysts 2016, 6(6), 76;
Received: 30 March 2016 / Revised: 13 May 2016 / Accepted: 17 May 2016 / Published: 25 May 2016
(This article belongs to the Special Issue Photocatalytic Wastewater Treatment)
PDF [3081 KB, uploaded 25 May 2016]


Hybrid multi-functional nanomaterials comprising two or more disparate materials have become a powerful approach to obtain advanced materials for environmental remediation applications. In this work, an Ag-Ag2O/TiO2@polypyrrole (Ag/TiO2@PPy) heterojunction has been synthesized by assembling a self-stabilized Ag-Ag2O (p type) semiconductor (denoted as Ag) and polypyrrole (π-conjugated polymer) on the surface of rutile TiO2 (n type). Ag/TiO2@PPy was synthesized through simultaneous oxidation of pyrrole monomers and reduction of AgNO3 in an aqueous solution containing well-dispersed TiO2 particles. Thus synthesized Ag/TiO2@PPy was characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and UV-Vis diffuse reflectance spectroscopy (UV-vis DSR). The photocatalytic activity of synthesized heterojunction was investigated for the decomposition of methylene blue (MB) dye under UV and visible light irradiation. The results revealed that π-conjugated p-n heterojunction formed in the case of Ag/TiO2@PPy significantly enhanced the photodecomposition of MB compared to the p-n type Ag/TiO2 and TiO2@PPy (n-π) heterojunctions. A synergistic effect between Ag-Ag2O and PPy leads to higher photostability and a better electron/hole separation leads to an enhanced photocatalytic activity of Ag/TiO2@PPy under both UV and visible light irradiations. View Full-Text
Keywords: Ag-Ag2O/TiO2@polyprrrole heterojunction; photocatalysis; methylene blue; Degradation mechanism Ag-Ag2O/TiO2@polyprrrole heterojunction; photocatalysis; methylene blue; Degradation mechanism

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Kumar, R.; El-Shishtawy, R.M.; Barakat, M.A. Synthesis and Characterization of Ag-Ag2O/TiO2@polypyrrole Heterojunction for Enhanced Photocatalytic Degradation of Methylene Blue. Catalysts 2016, 6, 76.

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