Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) Reduction
The photoreduction for hazardous Cr(VI) in industrial wastewater has been considered a “green” approach with low-cost and easy-to-go operation. SnS2 is a promising narrow bandgap photocatalyst, but its low charge carrier separation efficiency should be solved first. In this work, N-doped carbon quan...
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Frontiers Media S.A.
2022-06-01
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| Series: | Frontiers in Chemistry |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fchem.2022.911291/full |
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| author | Weidong Li Weidong Li Jianping Qiu Haihong Jin Yuanyuan Wang Dandan Ma Xinxiang Zhang Huayun Yang Fangyuan Wang |
| author_facet | Weidong Li Weidong Li Jianping Qiu Haihong Jin Yuanyuan Wang Dandan Ma Xinxiang Zhang Huayun Yang Fangyuan Wang |
| author_sort | Weidong Li |
| collection | DOAJ |
| description | The photoreduction for hazardous Cr(VI) in industrial wastewater has been considered a “green” approach with low-cost and easy-to-go operation. SnS2 is a promising narrow bandgap photocatalyst, but its low charge carrier separation efficiency should be solved first. In this work, N-doped carbon quantum dots (CQDs) were prepared and loaded onto SnS2 nanoparticles via an in situ method. The resulting composite samples (NC@SnS2) were characterized, and their photocatalytic performance was discussed. SnS2 nanoparticles were obtained as hexagonal ones with a bandgap of 2.19 eV. The optimal doping level for NC@SnS2 was citric acid: urea:SnS2 = 1.2 mmol:1.8 mmol:3.0 mmol. It showed an average diameter of 40 nm and improved photocatalytic performance, compared to pure SnS2, following a pseudo-first-order reaction with a kinetic rate constant of 0.1144 min−1. Over 97% of Cr(VI) was photo-reduced after 30 min. It was confirmed that modification of SnS2 with CQDs can not only improve the light-harvesting ability but also stimulate the charge separation, which therefore can enhance the photoreactivity of SnS2 toward Cr(VI) reduction. The excellent stability of NC@SnS2 indicates that it is promising to be practically used in industrial wastewater purification. |
| first_indexed | 2024-04-11T15:47:10Z |
| format | Article |
| id | doaj.art-ac35cfdad33e46e79ccb47883445605e |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-04-11T15:47:10Z |
| publishDate | 2022-06-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-ac35cfdad33e46e79ccb47883445605e2022-12-22T04:15:30ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462022-06-011010.3389/fchem.2022.911291911291Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) ReductionWeidong Li0Weidong Li1Jianping Qiu2Haihong Jin3Yuanyuan Wang4Dandan Ma5Xinxiang Zhang6Huayun Yang7Fangyuan Wang8Zhejiang Normal University Xingzhi College, Jinhua, ChinaHangzhou Normal University Qianjiang College, Hangzhou, ChinaZhejiang Normal University Xingzhi College, Jinhua, ChinaZhejiang Hongyi Environmental Protection Technology Co., Ltd., Hangzhou, ChinaEnvironmental Engineering Corporation of Zhejiang Province, Hangzhou, ChinaZhejiang Tianchuan Environmental Science and Technology Co., Ltd., Hangzhou, ChinaEnvironmental Engineering Corporation of Zhejiang Province, Hangzhou, ChinaHangzhou Normal University Qianjiang College, Hangzhou, ChinaZhejiang Normal University, Jinhua, ChinaThe photoreduction for hazardous Cr(VI) in industrial wastewater has been considered a “green” approach with low-cost and easy-to-go operation. SnS2 is a promising narrow bandgap photocatalyst, but its low charge carrier separation efficiency should be solved first. In this work, N-doped carbon quantum dots (CQDs) were prepared and loaded onto SnS2 nanoparticles via an in situ method. The resulting composite samples (NC@SnS2) were characterized, and their photocatalytic performance was discussed. SnS2 nanoparticles were obtained as hexagonal ones with a bandgap of 2.19 eV. The optimal doping level for NC@SnS2 was citric acid: urea:SnS2 = 1.2 mmol:1.8 mmol:3.0 mmol. It showed an average diameter of 40 nm and improved photocatalytic performance, compared to pure SnS2, following a pseudo-first-order reaction with a kinetic rate constant of 0.1144 min−1. Over 97% of Cr(VI) was photo-reduced after 30 min. It was confirmed that modification of SnS2 with CQDs can not only improve the light-harvesting ability but also stimulate the charge separation, which therefore can enhance the photoreactivity of SnS2 toward Cr(VI) reduction. The excellent stability of NC@SnS2 indicates that it is promising to be practically used in industrial wastewater purification.https://www.frontiersin.org/articles/10.3389/fchem.2022.911291/fullphotocatalystSnS2Cr(VI)carbon quantum dotsphotoreduction |
| spellingShingle | Weidong Li Weidong Li Jianping Qiu Haihong Jin Yuanyuan Wang Dandan Ma Xinxiang Zhang Huayun Yang Fangyuan Wang Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) Reduction Frontiers in Chemistry photocatalyst SnS2 Cr(VI) carbon quantum dots photoreduction |
| title | Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) Reduction |
| title_full | Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) Reduction |
| title_fullStr | Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) Reduction |
| title_full_unstemmed | Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) Reduction |
| title_short | Modifying SnS2 With Carbon Quantum Dots to Improve Photocatalytic Performance for Cr(VI) Reduction |
| title_sort | modifying sns2 with carbon quantum dots to improve photocatalytic performance for cr vi reduction |
| topic | photocatalyst SnS2 Cr(VI) carbon quantum dots photoreduction |
| url | https://www.frontiersin.org/articles/10.3389/fchem.2022.911291/full |
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