Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (3): 728-736.doi: 10.3866/PKU.WHXB201511303

• ARTICLE • Previous Articles     Next Articles

Preparation of Ternary Metal Sulfide/g-C3N4 Heterojunction Catalysts and Their Photocatalytic Activity under Visible Light

Yan-Juan WANG,Jia-Yao SUN,Rui-Jiang FENG,Jian ZHANG*()   

  • Received:2015-09-15 Published:2016-03-04
  • Contact: Jian ZHANG E-mail:zhangjianlshu@163.com
  • Supported by:
    the Natural Science Foundation of Liaoning Province, China(2015020590);Pilot Program of University of Liaoning Innovation and Education Reform, China

Abstract:

A novel Zn-Mo-CdS/g-C3N4 heterojunction photocatalyst was prepared by hydrothermal posttreatment using dicyandiamide, zinc acetate, ammonium molybdate, cadmium acetate, and sodium sulfide as raw materials. X-ray diffraction (XRD), ultraviolet-visible (UV-Vis), inductively coupled plasma atomic emission (ICP-AES), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) were used to characterize the prepared catalysts. The results indicate that heterojunctions are formed across the g-C3N4/Zn-Mo-CdS interface, which promotes interfacial charge transfer and inhibits the recombination of electrons and holes. The activities of as-prepared catalysts were tested through the photocatalytic degradation of Rhodamine B (RhB) under visible light. The results show that the Zn-Mo-CdS/g-C3N4 heterojunction photocatalyst clearly displayed increased activity compared with single g-C3N4 and Zn-Mo-CdS. At an optimal g-C3N4 mass fraction of 20%, the as-prepared heterojunction photocatalyst displayed the highest rate constant under visible light, which was 30 and 10 times of single g-C3N4 and Zn-Mo-CdS, respectively. Not only Zn-Mo-CdS, but also Mo-Ni-CdS and Ni-Sn-CdS can form heterojunctions with g-C3N4 to promote the rate of separation of electrons and holes and improve photocatalytic activity.

Key words: Carbon nitride, Ternary metal sulfide, Heterojunction, Photocatalysis, Organic matter degradation

MSC2000: 

  • O641