Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation

Novel composite photocatalysts consisting of petal-like cadmium sulphide (CdS) nanoparticles and varying amounts of exfoliated sulfur-doped carbon nitride (SCN) were successfully prepared. The as-obtained materials were characterized by field emission scanning electron microscopy, X-ray diffraction,...

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Main Authors: Wu, Yan, Wang, Hou, Tu, Wenguang, Wu, Shuyang, Liu, Yue, Tan, Yong Zen, Luo, Hanjin, Yuan, Xingzhong, Chew, Jia Wei
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/138364
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1383642020-05-05T02:39:45Z Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation Wu, Yan Wang, Hou Tu, Wenguang Wu, Shuyang Liu, Yue Tan, Yong Zen Luo, Hanjin Yuan, Xingzhong Chew, Jia Wei School of Chemical and Biomedical Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Science::Chemistry Exfoliated Graphitic Carbon Nitride Sulfur Doping Novel composite photocatalysts consisting of petal-like cadmium sulphide (CdS) nanoparticles and varying amounts of exfoliated sulfur-doped carbon nitride (SCN) were successfully prepared. The as-obtained materials were characterized by field emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflection spectroscopy, photoluminescence spectroscopy and photocurrent-time measurement. Results indicate a strong electric coupling interaction between SCN and CdS due to the heterojunction formed at the amine functionalities sites and oxidized chain terminations of SCN. Two typical pollutants like rhodamine B (RhB) and colorless bisphenol A (BPA) were used for the evaluation of photocatalytic activity. The best-performing CdS/SCN composite (i.e., CS5) synthesized exhibited enhanced visible-light-driven photocatalytic RhB efficiency of about 8.71 and 4.06 times higher than those of pure exfoliated SCN and CdS, respectively. As for BPA degradation, the CS5 composite was 9.00 and 3.61 times more efficient than that of exfoliated SCN and CdS, respectively. These excellent performances were found to be attributable to the remarkable charge carrier separation between CdS and exfoliated SCN with the aid of heterojunction interfacial structures. More importantly, the exfoliated SCN substantially reinforced the photostability of the CdS nanoparticles. Evaluation of the photocatalytic H2 evolution showed that the visible-light H2 production rate of the best-performing CS5 composite was also much greater than the constituents at 247.72 μmol h−1 g−1. Cyclic tests demonstrated the stability of the CS5 composite over repeated use. A possible mechanism was proposed to explain the photocatalytic reaction process. This study provides new insights into the preparation of highly efficient and stable sulfide-based composite photocatalysts, which are promising for implementation in wide-ranging environmental applications. MOE (Min. of Education, S’pore) EDB (Economic Devt. Board, S’pore) 2020-05-05T02:39:45Z 2020-05-05T02:39:45Z 2018 Journal Article Wu, Y., Wang, H., Tu, W., Wu, S., Liu, Y., Tan, Y. Z., . . . Chew, J. W. (2018). Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation. Applied Catalysis B: Environmental, 229, 181-191. doi:10.1016/j.apcatb.2018.02.029 0926-3373 https://hdl.handle.net/10356/138364 10.1016/j.apcatb.2018.02.029 2-s2.0-85042193536 229 181 191 en Applied Catalysis B: Environmental © 2018 Elsevier B.V. All rights reserved. This paper was published in Applied Catalysis B: Environmental and is made available with permission of Elsevier B.V.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Science::Chemistry
Exfoliated Graphitic Carbon Nitride
Sulfur Doping
spellingShingle Science::Chemistry
Exfoliated Graphitic Carbon Nitride
Sulfur Doping
Wu, Yan
Wang, Hou
Tu, Wenguang
Wu, Shuyang
Liu, Yue
Tan, Yong Zen
Luo, Hanjin
Yuan, Xingzhong
Chew, Jia Wei
Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation
description Novel composite photocatalysts consisting of petal-like cadmium sulphide (CdS) nanoparticles and varying amounts of exfoliated sulfur-doped carbon nitride (SCN) were successfully prepared. The as-obtained materials were characterized by field emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflection spectroscopy, photoluminescence spectroscopy and photocurrent-time measurement. Results indicate a strong electric coupling interaction between SCN and CdS due to the heterojunction formed at the amine functionalities sites and oxidized chain terminations of SCN. Two typical pollutants like rhodamine B (RhB) and colorless bisphenol A (BPA) were used for the evaluation of photocatalytic activity. The best-performing CdS/SCN composite (i.e., CS5) synthesized exhibited enhanced visible-light-driven photocatalytic RhB efficiency of about 8.71 and 4.06 times higher than those of pure exfoliated SCN and CdS, respectively. As for BPA degradation, the CS5 composite was 9.00 and 3.61 times more efficient than that of exfoliated SCN and CdS, respectively. These excellent performances were found to be attributable to the remarkable charge carrier separation between CdS and exfoliated SCN with the aid of heterojunction interfacial structures. More importantly, the exfoliated SCN substantially reinforced the photostability of the CdS nanoparticles. Evaluation of the photocatalytic H2 evolution showed that the visible-light H2 production rate of the best-performing CS5 composite was also much greater than the constituents at 247.72 μmol h−1 g−1. Cyclic tests demonstrated the stability of the CS5 composite over repeated use. A possible mechanism was proposed to explain the photocatalytic reaction process. This study provides new insights into the preparation of highly efficient and stable sulfide-based composite photocatalysts, which are promising for implementation in wide-ranging environmental applications.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Wu, Yan
Wang, Hou
Tu, Wenguang
Wu, Shuyang
Liu, Yue
Tan, Yong Zen
Luo, Hanjin
Yuan, Xingzhong
Chew, Jia Wei
format Article
author Wu, Yan
Wang, Hou
Tu, Wenguang
Wu, Shuyang
Liu, Yue
Tan, Yong Zen
Luo, Hanjin
Yuan, Xingzhong
Chew, Jia Wei
author_sort Wu, Yan
title Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation
title_short Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation
title_full Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation
title_fullStr Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation
title_full_unstemmed Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and H2 generation
title_sort petal-like cds nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible-light–driven photocatalytic water purification and h2 generation
publishDate 2020
url https://hdl.handle.net/10356/138364
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