2D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance
Photo-Fenton degradation of pollutants in wastewater is an ideal choice for large scale practical applications. Herein, two-dimensional (2D) in-plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n heterostructures have been successfully constructed by an in situ assembly strategy and c...
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MDPI AG
2019-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/9/8/1151 |
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| author | Li Guo Kailai Zhang Xuanxuan Han Qiang Zhao Danjun Wang Feng Fu |
| author_facet | Li Guo Kailai Zhang Xuanxuan Han Qiang Zhao Danjun Wang Feng Fu |
| author_sort | Li Guo |
| collection | DOAJ |
| description | Photo-Fenton degradation of pollutants in wastewater is an ideal choice for large scale practical applications. Herein, two-dimensional (2D) in-plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n heterostructures have been successfully constructed by an in situ assembly strategy and characterized using XRD, XPS, SEM/TEM, EDX, UV-Vis-DRS, PL, TR-PL, ESR, and VB-XPS techniques. The XPS and the TEM results confirm the formation of CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructures. The as-constructed CuS/Bi<sub>2</sub>WO<sub>6</sub> showed excellent absorption in visible region and superior charge carrier separation efficiency due to the formation of a type-II heterojunctions. Under visible light irradiation, 0.1% CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructure exhibited the best photo-Fenton-like catalytic performance. The degradation efficiency of Rhodamine B (RhB, 20 mg·L<sup>−1</sup>) can reach nearly 100% within 25 min, the apparent rate constant (k<sub>app</sub>/min<sup>−1</sup>) is approximately 40.06 and 3.87 times higher than that of pure CuS and Bi<sub>2</sub>WO<sub>6</sub>, respectively. The degradation efficiency of tetracycline hydrochloride (TC-HCl, 40mg·L<sup>−1</sup>) can reach 73% in 50 min by employing 0.1% CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructure as a photo-Fenton-like catalyst. The promoted photo-Fenton catalytic activity of CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n heterostructures is partly ascribed to its low carriers recombination rate. Importantly, CuS in CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructures is conducive to the formation of heterogeneous photo-Fenton catalytic system, in which Bi<sub>2</sub>WO<sub>6</sub> provides a strong reaction site for CuS to avoid the loss of Cu<sup>2+</sup> in Fenton reaction, resulting in its excellent stability and reusability. The possible photo-Fenton-like catalytic degradation mechanism of RhB and TC-HCl was also elucidated on the basis of energy band structure analysis and radical scavenger experiments. The present study provides strong evidence for CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructures to be used as promising candidates for photo-Fenton treatment of organic pollutants. |
| first_indexed | 2024-12-18T19:41:47Z |
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| last_indexed | 2024-12-18T19:41:47Z |
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| spelling | doaj.art-ad342383023740afba8239d8a93a60382022-12-21T20:55:25ZengMDPI AGNanomaterials2079-49912019-08-0198115110.3390/nano9081151nano90811512D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation PerformanceLi Guo0Kailai Zhang1Xuanxuan Han2Qiang Zhao3Danjun Wang4Feng Fu5College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yanan 716000, ChinaCollege of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yanan 716000, ChinaCollege of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yanan 716000, ChinaCollege of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yanan 716000, ChinaCollege of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yanan 716000, ChinaCollege of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yanan 716000, ChinaPhoto-Fenton degradation of pollutants in wastewater is an ideal choice for large scale practical applications. Herein, two-dimensional (2D) in-plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n heterostructures have been successfully constructed by an in situ assembly strategy and characterized using XRD, XPS, SEM/TEM, EDX, UV-Vis-DRS, PL, TR-PL, ESR, and VB-XPS techniques. The XPS and the TEM results confirm the formation of CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructures. The as-constructed CuS/Bi<sub>2</sub>WO<sub>6</sub> showed excellent absorption in visible region and superior charge carrier separation efficiency due to the formation of a type-II heterojunctions. Under visible light irradiation, 0.1% CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructure exhibited the best photo-Fenton-like catalytic performance. The degradation efficiency of Rhodamine B (RhB, 20 mg·L<sup>−1</sup>) can reach nearly 100% within 25 min, the apparent rate constant (k<sub>app</sub>/min<sup>−1</sup>) is approximately 40.06 and 3.87 times higher than that of pure CuS and Bi<sub>2</sub>WO<sub>6</sub>, respectively. The degradation efficiency of tetracycline hydrochloride (TC-HCl, 40mg·L<sup>−1</sup>) can reach 73% in 50 min by employing 0.1% CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructure as a photo-Fenton-like catalyst. The promoted photo-Fenton catalytic activity of CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n heterostructures is partly ascribed to its low carriers recombination rate. Importantly, CuS in CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructures is conducive to the formation of heterogeneous photo-Fenton catalytic system, in which Bi<sub>2</sub>WO<sub>6</sub> provides a strong reaction site for CuS to avoid the loss of Cu<sup>2+</sup> in Fenton reaction, resulting in its excellent stability and reusability. The possible photo-Fenton-like catalytic degradation mechanism of RhB and TC-HCl was also elucidated on the basis of energy band structure analysis and radical scavenger experiments. The present study provides strong evidence for CuS/Bi<sub>2</sub>WO<sub>6</sub> heterostructures to be used as promising candidates for photo-Fenton treatment of organic pollutants.https://www.mdpi.com/2079-4991/9/8/1151Bi<sub>2</sub>WO<sub>6</sub> nanosheetsphoto-Fentondegradationvisible light irradiation2D in-plane heterostructures |
| spellingShingle | Li Guo Kailai Zhang Xuanxuan Han Qiang Zhao Danjun Wang Feng Fu 2D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance Nanomaterials Bi<sub>2</sub>WO<sub>6</sub> nanosheets photo-Fenton degradation visible light irradiation 2D in-plane heterostructures |
| title | 2D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance |
| title_full | 2D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance |
| title_fullStr | 2D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance |
| title_full_unstemmed | 2D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance |
| title_short | 2D In-Plane CuS/Bi<sub>2</sub>WO<sub>6</sub> p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance |
| title_sort | 2d in plane cus bi sub 2 sub wo sub 6 sub p n heterostructures with promoted visible light driven photo fenton degradation performance |
| topic | Bi<sub>2</sub>WO<sub>6</sub> nanosheets photo-Fenton degradation visible light irradiation 2D in-plane heterostructures |
| url | https://www.mdpi.com/2079-4991/9/8/1151 |
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