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Article – Journal of Advanced Chemical Sciences

Journal of Advanced Chemical Sciences, Volume 2,Issue 2,2016 Pages 267-270

Greater Sensitizing and Catalytic Role of Nano-Gold Compared To Conductive Polypyrrole in Visible Light Activation of TiO2
E. Subramanian*, G.I. Adlin Sheeba, J.V. Anusha

In the present work TiO2 is chemically modified by loading with conductive polypyrrole (Ppy). Using FeCl3 as the oxidizing agent Ppy was synthesized and loaded in situ on TiO2 at various wt% (0.5, 1, 2 and 5 wt%) forming organic-inorganic hybrid (OIH) material. In addition, TiO2 and OIH material were further modified using Au metal nanoparticle. FTIR, XRD, DRS and SEM characterizations revealed the formation of hybrid material, Au-TiO2 and the ternary system Au-Ppy-TiO2. All the materials were applied for the visible light photodegradation of rhodamine 6G in aqueous medium. The dye was degraded by 45%, 57%, 68% and 69% with bare TiO2, 1 wt% Ppy-TiO2, Au-TiO2 and Au-Ppy-TiO2 in 2 hour respectively. Ppy-TiO2 OIH material and Au-TiO2 have higher efficiency than bare TiO2 and prove that the present chemical modification is a facile route to activate TiO2 under visible light. Au-TiO2 has exceeding efficiency (68%) than Ppy-TiO2 (57%) and thus nano gold exhibits a greater sensitizing and catalytic role than Ppy in visible light activation of TiO2. However, when both Au and Ppy are present together on TiO2 (ternary system), the efficiency is not much improved (69%) by Ppy loading.

Keywords: Titanium Dioxide; Conducting Polypyrrole; Hybrid Materials; Photocatalysis;