摘要
The photocatalytic performance of graphitic carbon nitride (g-C 3 N 4 ) heterostructures related to the charge carrier separation and transport efficiency is often governed by the interfaces. Herein, in-situ growth of W 18 O 49 nanobelts is attained on amorphous and crystalline g-C 3 N 4 nanosheets to study the effects of the interfaces on photocatalytic oxidation activities. The horizontal growth of W 18 O 49 on g-C 3 N 4 nanosheets is the key in formation of two dimensional (2D)/2D W 18 O 49 /g-C 3 N 4 heterostructures. The growth of W 18 O 49 nanobelts on crystalline g-C 3 N 4 nanosheets shows well-developed interfaces (sample W 18 O 49 -CCN) in comparison with heterostructures constructed using amorphous g-C 3 N 4 base (sample W 18 O 49 -ACN). Characterizations on the structure, components, and properties of the samples demonstrate that these heterostructures reveal extended photo-absorption in visible to near infrared region, with sample W 18 O 49 -CCN showing much higher photogenerated charge carrier separation and transport efficiency. A H 2 O 2 evolution rate of 5550 µMg −1 h −1 is observed for sample W 18 O 49 -CCN under full solar-spectrum illumination (and 398 µMg −1 h −1 observed for pristine crystalline g-C 3 N 4 ), which is ∼ 2.4 times of that of sample W 18 O 49 -ACN prepared using amorphous g-C 3 N 4 . In addition, a NO removal rate of 72.1% is observed for sample W 18 O 49 -CCN with a NO 2 selectivity of 6.2%. These results provide inspiration for construction of g-C 3 N 4 homojunctions for practical photo-redox reaction applications.