基于单质法合成直接Z型CuS-WO3及光催化性能

doi:10.3866/PKU.WHXB201705111

Abstract

Abstract:

CuS fabricated by an element-reaction route using copper and sulfur powders was loaded on WO₃ in situ at a low temperature. X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller analysis, and UV-visible diffuse reflectance spectra were used to characterize the crystalline phase, morphology, particle size, and optical properties of the CuS-WO₃ samples. CuS modification had no obvious influence on the crystalline phase, particle size, and surface area of WO₃. However, it led to the enhancement of the utilization of light energy for WO₃. CuS-WO₃ composites were utilized as photocatalysts for the degradation of Rhodamine B. The CuS-WO₃ photocatalysts showed higher photocatalytic activity than pure WO₃ or CuS under visible light irradiation. CuS content had a significant influence on the photocatalytic activity of CuS-WO₃. CuS-WO₃ with 7% (w, mass fraction) CuS content exhibited the highest photocatalytic degradation activity (91.3%). Based on analysis of the band structure of CuS and WO₃, photoluminescence results, and active species trapping, a "direct Z-scheme" mechanism for the enhanced photocatalytic activity of CuS-WO₃ was proposed. The "direct Z-scheme" results in effective charge separation, leading to increased photocatalytic activity compared to that of CuS and WO₃.

Key words: CuS, WO₃, Direct Z-scheme, Rhodamine B, Photocatalytic

Chun-Dong SONG,Jing ZHANG,Ying GAO,Yuan-Yuan LU,Fang-Fang WANG. Synthesis Direct Z-Scheme CuS-WO₃ Photocatalysts Based on an Element-Reaction Route and Their Photocatalytic Activity[J]. Acta Phys. -Chim. Sin. 2017, 33(9), 1891-1897. doi: 10.3866/PKU.WHXB201705111

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Synthesis Direct Z-Scheme CuS-WO₃ Photocatalysts Based on an Element-Reaction Route and Their Photocatalytic Activity

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Synthesis Direct Z-Scheme CuS-WO3 Photocatalysts Based on an Element-Reaction Route and Their Photocatalytic Activity

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Synthesis Direct Z-Scheme CuS-WO₃ Photocatalysts Based on an Element-Reaction Route and Their Photocatalytic Activity