三元金属硫化物-石墨相氮化碳异质结催化剂的制备及光催化性能

doi:10.3866/PKU.WHXB201511303

Abstract

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

Yan-Juan WANG,Jia-Yao SUN,Rui-Jiang FENG,Jian ZHANG. Preparation of Ternary Metal Sulfide/g-C₃N₄ Heterojunction Catalysts and Their Photocatalytic Activity under Visible Light[J].Acta Phys. -Chim. Sin., 2016, 32(3): 728-736.

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

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