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The combination of two or more semiconductor materials for the synthesis of new hybrid photocatalyst could be a good approach to enhance the visible light absorption, electron-hole (e − /h + ) pair separation rate and photocatalytic decomposition of the organic contaminants. Herein, a facile  in situ  oxidative polymerization method has been used for the synthesis of visible light active g-C 3 N 4 /TiO 2 @polyaniline (g-C 3 N 4 /TiO 2 @PANI) nanocomposite for the decomposition of the congo red (CR) under the solar light irradiation. Prior to making the composite of TiO 2  (P25) with g-C 3 N 4  and polyaniline, a lamellar structure was generated onto the TiO 2  brim by alkali hydrothermal treatment to enhance the surface area and adsorption properties. The PL and UV-visible analysis clearly showed the fast separation of the e − /h +  pair, and reduction in the bandgap energy of the g-C 3 N 4 /TiO 2 @PANI nanocomposite. The results revealed TiO 2 , PANI and g-C 3 N 4  showed the synergestic behavior in the g-C 3 N 4 /TiO 2 @PANI nanocomposite and greatly enhanced the photocatalytic degradation of the CR. The photocatalytic decomposition of the CR was almost 100% for 20 mg/L at pH 5, 7 and 180 min. The reusability study of the spent catalyst showed the 90% degradation of CR after four consecutive cycles indicate that g-C 3 N 4 /TiO 2 @PANI nanocomposite is a stable and efficient catalyst. The high efficiency and reusability of the g-C 3 N 4 /TiO 2 @PANI nanocomposite could be attributed to the higher visible light absorption and sensitizing effect of the g-C 3 N 4  and PANI.

Construction of a ternary g-C3N4/TiO2@polyaniline nanocomposite for the enhanced photocatalytic activity under solar light