skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Enhanced performance of direct Z-scheme CuS-WO 3 system towards photocatalytic decomposition of organic pollutants under visible light

Abstract

CuS-WO 3 composites were synthesized by an in situ solution method at low temperature. The crystalline phase, morphology, particle size, and the optical properties of CuS-WO 3 samples were characterized by XRD, SEM, XPS, and UV–vis diffuse reflectance spectra. CuS-WO 3 composites showed much higher activity for photocatalytic degradation of RhB as compared with WO 3 and CuS. The degradation rate constant over 1 wt% CuS-WO 3 catalyst was 4.4 times and 9.2 times higher than that of WO 3 and CuS, respectively. It is found that holes (h+) and superoxide radical anions (O2-) are the dominant reactive species by using methanol, disodium ethylenediaminetetraacetate (EDTA) and ascorbic acid as scavengers. Band structure analysis shows that bottom of CB of WO 3 is very similar with and higher (ca. 0.01 eV) than the top of VB of CuS. The results of PL showed that the similarity renders the recombination between photogenerated holes on the VB of CuS and photogenerated electrons on the CB of WO 3 possible and easy, forming a direct Z-scheme in CuS-WO 3. This result in that more electrons in the CB of CuS and holes in the VB of WO 3 survived, and then participated in themore » photocatalytic degradation of RhB, showing an increased activity.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1417442
Report Number(s):
PNNL-SA-131499
Journal ID: ISSN 0169-4332; KC0302010
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Surface Science; Journal Volume: 425; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Song, Chundong, Wang, Xiang, Zhang, Jing, Chen, Xuebing, and Li, Can. Enhanced performance of direct Z-scheme CuS-WO 3 system towards photocatalytic decomposition of organic pollutants under visible light. United States: N. p., 2017. Web. doi:10.1016/j.apsusc.2017.07.082.
Song, Chundong, Wang, Xiang, Zhang, Jing, Chen, Xuebing, & Li, Can. Enhanced performance of direct Z-scheme CuS-WO 3 system towards photocatalytic decomposition of organic pollutants under visible light. United States. doi:10.1016/j.apsusc.2017.07.082.
Song, Chundong, Wang, Xiang, Zhang, Jing, Chen, Xuebing, and Li, Can. Fri . "Enhanced performance of direct Z-scheme CuS-WO 3 system towards photocatalytic decomposition of organic pollutants under visible light". United States. doi:10.1016/j.apsusc.2017.07.082.
@article{osti_1417442,
title = {Enhanced performance of direct Z-scheme CuS-WO 3 system towards photocatalytic decomposition of organic pollutants under visible light},
author = {Song, Chundong and Wang, Xiang and Zhang, Jing and Chen, Xuebing and Li, Can},
abstractNote = {CuS-WO3 composites were synthesized by an in situ solution method at low temperature. The crystalline phase, morphology, particle size, and the optical properties of CuS-WO3 samples were characterized by XRD, SEM, XPS, and UV–vis diffuse reflectance spectra. CuS-WO3 composites showed much higher activity for photocatalytic degradation of RhB as compared with WO3 and CuS. The degradation rate constant over 1 wt% CuS-WO3 catalyst was 4.4 times and 9.2 times higher than that of WO3 and CuS, respectively. It is found that holes (h+) and superoxide radical anions (O2-) are the dominant reactive species by using methanol, disodium ethylenediaminetetraacetate (EDTA) and ascorbic acid as scavengers. Band structure analysis shows that bottom of CB of WO3 is very similar with and higher (ca. 0.01 eV) than the top of VB of CuS. The results of PL showed that the similarity renders the recombination between photogenerated holes on the VB of CuS and photogenerated electrons on the CB of WO3 possible and easy, forming a direct Z-scheme in CuS-WO3. This result in that more electrons in the CB of CuS and holes in the VB of WO3 survived, and then participated in the photocatalytic degradation of RhB, showing an increased activity.},
doi = {10.1016/j.apsusc.2017.07.082},
journal = {Applied Surface Science},
number = C,
volume = 425,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2017},
month = {Fri Dec 01 00:00:00 EST 2017}
}