The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation
Oxalic acid, which mainly originates from root exudation and plant residue decomposition, is one of the most widely existiug carboxylic acids, and has a dramatic impact on the reduction of chromate in natural waters. In this study, isothermal titration calorimetry (ITC), theoretical calculations, an...
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Editorial Office of Energy Environmental Protection
2024-02-01
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| Series: | 能源环境保护 |
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| Online Access: | https://eep1987.com/en/article/4785 |
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| author | GUAN Yingying WANG Hao GE Xiaoming DENG Likai DENG Bin MU Yi* ZOU Jianping* |
| author_facet | GUAN Yingying WANG Hao GE Xiaoming DENG Likai DENG Bin MU Yi* ZOU Jianping* |
| author_sort | GUAN Yingying |
| collection | DOAJ |
| description | Oxalic acid, which mainly originates from root exudation and plant residue decomposition, is one of the most widely existiug carboxylic acids, and has a dramatic impact on the reduction of chromate in natural waters. In this study, isothermal titration calorimetry (ITC), theoretical calculations, and electrospray ionization high resolution mass spectrometry (ESI-HRMS) analysis revealed that oxalic acid could complex with chromate to form a Cr(Ⅵ)-oxalate complex via an esterification process at pH≤4. The in situ generated HC2CrO7 complex was a visible-light-active species, and visible light could induce electron transfer from the oxalate unit to the Cr(Ⅵ) within the HC2CrO7 complex via a HOMO-LUMO electronic transition, resulting in Cr(Ⅵ) reduction. Subsequently, we verified the Cr(Ⅵ) reduction intermediates, and the hypotoxic Cr(Ⅲ) species [Cr3+-(C2O2-4)3] 3- was the final product. Finally, the pathway of Cr(Ⅵ) reduction by oxalic acid under visible-light irradiation was proposed. This study will provide a theoretical basis for efficient photoreduction of Cr(Ⅵ) pollution using oxalic acid. |
| format | Article |
| id | doaj-art-333298202dd34050a38f96a72f122a6f |
| institution | Kabale University |
| issn | 2097-4183 |
| language | zho |
| publishDate | 2024-02-01 |
| publisher | Editorial Office of Energy Environmental Protection |
| record_format | Article |
| series | 能源环境保护 |
| spelling | doaj-art-333298202dd34050a38f96a72f122a6f2025-01-24T06:59:46ZzhoEditorial Office of Energy Environmental Protection能源环境保护2097-41832024-02-0138110911810.20078/j.eep.20240123The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiationGUAN Yingying0WANG Hao1GE Xiaoming2DENG Likai3DENG Bin4MU Yi*5ZOU Jianping*6Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong UniversityDepartment of Security and Protection, Aecc South Industry Company LimitedDepartment of Security and Protection, Aecc South Industry Company LimitedDepartment of Security and Protection, Aecc South Industry Company LimitedDepartment of Security and Protection, Aecc South Industry Company LimitedKey Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong UniversityKey Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong UniversityOxalic acid, which mainly originates from root exudation and plant residue decomposition, is one of the most widely existiug carboxylic acids, and has a dramatic impact on the reduction of chromate in natural waters. In this study, isothermal titration calorimetry (ITC), theoretical calculations, and electrospray ionization high resolution mass spectrometry (ESI-HRMS) analysis revealed that oxalic acid could complex with chromate to form a Cr(Ⅵ)-oxalate complex via an esterification process at pH≤4. The in situ generated HC2CrO7 complex was a visible-light-active species, and visible light could induce electron transfer from the oxalate unit to the Cr(Ⅵ) within the HC2CrO7 complex via a HOMO-LUMO electronic transition, resulting in Cr(Ⅵ) reduction. Subsequently, we verified the Cr(Ⅵ) reduction intermediates, and the hypotoxic Cr(Ⅲ) species [Cr3+-(C2O2-4)3] 3- was the final product. Finally, the pathway of Cr(Ⅵ) reduction by oxalic acid under visible-light irradiation was proposed. This study will provide a theoretical basis for efficient photoreduction of Cr(Ⅵ) pollution using oxalic acid.https://eep1987.com/en/article/4785oxalic acidphotoreductionheavy metalcr(ⅵ) |
| spellingShingle | GUAN Yingying WANG Hao GE Xiaoming DENG Likai DENG Bin MU Yi* ZOU Jianping* The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation 能源环境保护 oxalic acid photoreduction heavy metal cr(ⅵ) |
| title | The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation |
| title_full | The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation |
| title_fullStr | The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation |
| title_full_unstemmed | The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation |
| title_short | The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation |
| title_sort | coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of cr vi under visible light irradiation |
| topic | oxalic acid photoreduction heavy metal cr(ⅵ) |
| url | https://eep1987.com/en/article/4785 |
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