Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant Degradation
Photocatalytic technology could effectively degrade pollutants and release hydrogen. Herein, novel composite materials of Zn<sub>0.4</sub>Cd<sub>0.6</sub>S (ZCS) and cobalt antimony oxide (CSO) with different proportions were successfully synthesized through a hydrothermal re...
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| Format: | Article |
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MDPI AG
2022-11-01
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| author | Chen Chen Xiao Zhang Ting Cheng Mingyue Wen Yuan Tian Baoxuan Hou |
| author_facet | Chen Chen Xiao Zhang Ting Cheng Mingyue Wen Yuan Tian Baoxuan Hou |
| author_sort | Chen Chen |
| collection | DOAJ |
| description | Photocatalytic technology could effectively degrade pollutants and release hydrogen. Herein, novel composite materials of Zn<sub>0.4</sub>Cd<sub>0.6</sub>S (ZCS) and cobalt antimony oxide (CSO) with different proportions were successfully synthesized through a hydrothermal reaction process. It was proved via various characterization analyses that abundant nano ZCS particles (about 100 nm) were closely coated on the surface of larger CSO particles in the composite photocatalysts, and the heterojunction structure was formed. The synthesized materials could be used as highly efficient photocatalysts to boost the photocatalytic hydrogen evolution and degradation of methylene blue (MB) in visible light. The composite photocatalysts displayed favorable stability, and the optimal proportion was ZCS/1CSO. In addition, the composite materials exhibited a wider absorption range for visible light, and the apparent hydrogen production rate was about 3.087 mmol·g<sup>−1</sup>·h<sup>−1</sup>. Meanwhile, compared with single materials, the composite photocatalyst obtained higher photocurrent response and lower electrochemical impedance through conducting photo-electrochemical experiments and analysis. Moreover, all of the photo-generated electrons, superoxide radicals, photo-generated holes, and hydroxyl radicals were proved to contribute the MB photodegradation and hydrogen evolution, and the former two active species played more vital roles. Furthermore, the effective separation of photo-generated electrons and holes through the n-type of ZCS and p-type of CSO heterojunction structure accelerated the improvement of photocatalytic abilities for composite materials. The photo-generated electrons concentrated in the conduction band of ZCS might be helpful for the improvement of hydrogen evolution abilities of composite photocatalysts. This work not only provides a novel strategy towards high-efficiency composite photocatalysts through constructing heterojunction assisted with hydrothermal reaction, but also demonstrates the possibility of utilizing binary composites for enhanced hydrogen evolution reaction and pollutant degradation. |
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| spelling | doaj.art-0c66cbc9e8324bc9b3c01fdc2b90e0142023-11-24T12:31:49ZengMDPI AGWater2073-44412022-11-011423382710.3390/w14233827Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant DegradationChen Chen0Xiao Zhang1Ting Cheng2Mingyue Wen3Yuan Tian4Baoxuan Hou5School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Environmental Ecology, Jiangsu City Vocational College, Nanjing 210017, ChinaSchool of Environmental Ecology, Jiangsu City Vocational College, Nanjing 210017, ChinaSchool of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaPhotocatalytic technology could effectively degrade pollutants and release hydrogen. Herein, novel composite materials of Zn<sub>0.4</sub>Cd<sub>0.6</sub>S (ZCS) and cobalt antimony oxide (CSO) with different proportions were successfully synthesized through a hydrothermal reaction process. It was proved via various characterization analyses that abundant nano ZCS particles (about 100 nm) were closely coated on the surface of larger CSO particles in the composite photocatalysts, and the heterojunction structure was formed. The synthesized materials could be used as highly efficient photocatalysts to boost the photocatalytic hydrogen evolution and degradation of methylene blue (MB) in visible light. The composite photocatalysts displayed favorable stability, and the optimal proportion was ZCS/1CSO. In addition, the composite materials exhibited a wider absorption range for visible light, and the apparent hydrogen production rate was about 3.087 mmol·g<sup>−1</sup>·h<sup>−1</sup>. Meanwhile, compared with single materials, the composite photocatalyst obtained higher photocurrent response and lower electrochemical impedance through conducting photo-electrochemical experiments and analysis. Moreover, all of the photo-generated electrons, superoxide radicals, photo-generated holes, and hydroxyl radicals were proved to contribute the MB photodegradation and hydrogen evolution, and the former two active species played more vital roles. Furthermore, the effective separation of photo-generated electrons and holes through the n-type of ZCS and p-type of CSO heterojunction structure accelerated the improvement of photocatalytic abilities for composite materials. The photo-generated electrons concentrated in the conduction band of ZCS might be helpful for the improvement of hydrogen evolution abilities of composite photocatalysts. This work not only provides a novel strategy towards high-efficiency composite photocatalysts through constructing heterojunction assisted with hydrothermal reaction, but also demonstrates the possibility of utilizing binary composites for enhanced hydrogen evolution reaction and pollutant degradation.https://www.mdpi.com/2073-4441/14/23/3827cobalt antimony oxideZnCdSphotocatalytichydrogen evolutionpollutant degradation |
| spellingShingle | Chen Chen Xiao Zhang Ting Cheng Mingyue Wen Yuan Tian Baoxuan Hou Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant Degradation Water cobalt antimony oxide ZnCdS photocatalytic hydrogen evolution pollutant degradation |
| title | Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant Degradation |
| title_full | Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant Degradation |
| title_fullStr | Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant Degradation |
| title_full_unstemmed | Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant Degradation |
| title_short | Construction of Highly Efficient Zn<sub>0.4</sub>Cd<sub>0.6</sub>S and Cobalt Antimony Oxide Heterojunction Composites for Visible-Light-Driven Photocatalytic Hydrogen Evolution and Pollutant Degradation |
| title_sort | construction of highly efficient zn sub 0 4 sub cd sub 0 6 sub s and cobalt antimony oxide heterojunction composites for visible light driven photocatalytic hydrogen evolution and pollutant degradation |
| topic | cobalt antimony oxide ZnCdS photocatalytic hydrogen evolution pollutant degradation |
| url | https://www.mdpi.com/2073-4441/14/23/3827 |
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