Synthesis and photoelectrochemical properties of visible-light response g-C3N4@CdS heterojunctions photocatalyst
Jinhuan Ma, Zhiqiang Wei, Ling Li, Long Ma, Chao Li, Shangpan Huang
Abstract
ABSTRACT g-C 3 N 4 @CdS nanocomposites with different mass ratios were successfully fabricated by the precipitation method. Different ratios were investigated for their influence on the microstructure, photoelectrochemical, and photocatalytic properties of the as-prepared samples. The experimental results show that g-C 3 N 4 @CdS nanocomposites are hexagonal structures with good crystallization, and g-C 3 N 4 wraps one-dimensional CdS nanorods. g-C 3 N 4 @CdS nanocomposites exhibit excellent visible-light absorption. The PL spectra, transient photocurrent response, and EIS measurements of g-C 3 N 4 @CdS composites indicate that heterojunctions accelerate the separation and migration of photo-generated electron-hole pairs and inhibit the recombination of photo-generated carriers. Under simulated sunlight irradiation, the g-C 3 N 4 @CdS photocatalyst accelerates the redox reaction and improves photocatalytic efficiency to degrade MO, compared to pure photocatalysts. g-C 3 N 4 @ CdS photocatalysts exhibit good degradation efficiency and excellent recyclability. In addition, •O 2 − and • OH play a key role in the photocatalytic degradation process.