Direct Generation of Fine Bi 2 WO 6 Nanocrystals on g‐C 3 N 4 Nanosheets for Enhanced Photocatalytic Activity

Graphitic carbon nitride (g‐C 3 N 4 ) coupled with Bi 2 WO 6 is a promising Type II heterojunction, but it is still difficult to obtain uniform nanocomposites of these materials with the present assembly methods. Here we employ g‐C 3 N 4 nanosheets saturated with Bi 3+ ions to provide numerous and widespread nucleation sites for the growth of Bi 2 WO 6 nanocrystals. As a result, g‐C 3 N 4 nanosheets loaded with fine and controllable amount of Bi 2 WO 6 nanocrystals are produced. The g‐C 3 N 4 /Bi 2 WO 6 nanocomposites exhibit significantly enhanced photocatalytic activity for RhB degradation under visible‐light irradiation. Particularly, the g‐C 3 N 4 /70 % Bi 2 WO 6 nanocomposite achieves the highest photocatalytic activity, and the average rate constant is almost 5 and 9 times higher than those of bare g‐C 3 N 4 and Bi 2 WO 6 , respectively. Moreover, the composite exhibits high photocatalytic stability in cycling tests.