Visible-light degradation of azo dyes by imine-linked covalent organic frameworks
Covalent organic frameworks (COFs) are nanoporous crystalline polymers with densely conjugated structures. This work discovers that imine-linked COFs exhibit remarkable photodegradation efficiency to azo dyes dissolved in water. Visible light generates different types of radicals from COFs, and supe...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-02-01
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| Series: | Green Energy & Environment |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468025720301515 |
| _version_ | 1828056543450365952 |
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| author | Hongbo Xue Sen Xiong Kai Mi Yong Wang |
| author_facet | Hongbo Xue Sen Xiong Kai Mi Yong Wang |
| author_sort | Hongbo Xue |
| collection | DOAJ |
| description | Covalent organic frameworks (COFs) are nanoporous crystalline polymers with densely conjugated structures. This work discovers that imine-linked COFs exhibit remarkable photodegradation efficiency to azo dyes dissolved in water. Visible light generates different types of radicals from COFs, and superoxide radicals break NN bonds in dye molecules, resulting in 100% degradation of azo dyes within 1 h. In contrast, these dyes cannot be degraded by conventionally used photocatalysts, for example, TiO2. Importantly, the COF photocatalysts can be recovered from the dye solutions and re-used to degrade azo dyes for multiple times without loss of degradation efficiency. This work provides an efficient strategy to degrade synthetic dyes, and we expect that COFs with designable structures may use as new photocatalysts for other important applications. |
| first_indexed | 2024-04-10T20:56:57Z |
| format | Article |
| id | doaj.art-a723b3e60b864e1bbc9109d5f0ac5f7f |
| institution | Directory Open Access Journal |
| issn | 2468-0257 |
| language | English |
| last_indexed | 2024-04-10T20:56:57Z |
| publishDate | 2023-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Green Energy & Environment |
| spelling | doaj.art-a723b3e60b864e1bbc9109d5f0ac5f7f2023-01-23T04:08:52ZengKeAi Communications Co., Ltd.Green Energy & Environment2468-02572023-02-0181194199Visible-light degradation of azo dyes by imine-linked covalent organic frameworksHongbo Xue0Sen Xiong1Kai Mi2Yong Wang3State Key Laboratory of Materials-Oriented Chemical Engineering, And College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, And College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, And College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, ChinaCorresponding author. Fax: +86 25-83172292.; State Key Laboratory of Materials-Oriented Chemical Engineering, And College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, ChinaCovalent organic frameworks (COFs) are nanoporous crystalline polymers with densely conjugated structures. This work discovers that imine-linked COFs exhibit remarkable photodegradation efficiency to azo dyes dissolved in water. Visible light generates different types of radicals from COFs, and superoxide radicals break NN bonds in dye molecules, resulting in 100% degradation of azo dyes within 1 h. In contrast, these dyes cannot be degraded by conventionally used photocatalysts, for example, TiO2. Importantly, the COF photocatalysts can be recovered from the dye solutions and re-used to degrade azo dyes for multiple times without loss of degradation efficiency. This work provides an efficient strategy to degrade synthetic dyes, and we expect that COFs with designable structures may use as new photocatalysts for other important applications.http://www.sciencedirect.com/science/article/pii/S2468025720301515Covalent organic frameworksDyesPhotocatalytic degradationPorous polymerWater pollution |
| spellingShingle | Hongbo Xue Sen Xiong Kai Mi Yong Wang Visible-light degradation of azo dyes by imine-linked covalent organic frameworks Green Energy & Environment Covalent organic frameworks Dyes Photocatalytic degradation Porous polymer Water pollution |
| title | Visible-light degradation of azo dyes by imine-linked covalent organic frameworks |
| title_full | Visible-light degradation of azo dyes by imine-linked covalent organic frameworks |
| title_fullStr | Visible-light degradation of azo dyes by imine-linked covalent organic frameworks |
| title_full_unstemmed | Visible-light degradation of azo dyes by imine-linked covalent organic frameworks |
| title_short | Visible-light degradation of azo dyes by imine-linked covalent organic frameworks |
| title_sort | visible light degradation of azo dyes by imine linked covalent organic frameworks |
| topic | Covalent organic frameworks Dyes Photocatalytic degradation Porous polymer Water pollution |
| url | http://www.sciencedirect.com/science/article/pii/S2468025720301515 |
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