Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon Nitride
Graphitic phase carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) is a promising photocatalytic environmental material. For this study, the graphitic phase carbon nitride was prepared using a thermal polymerization method. The characteristic peaks, structures, and morphologies we...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/6/2796 |
| _version_ | 1827748377941508096 |
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| author | Wen Yang Kun Ding Guangzhou Chen Hua Wang Xinyue Deng |
| author_facet | Wen Yang Kun Ding Guangzhou Chen Hua Wang Xinyue Deng |
| author_sort | Wen Yang |
| collection | DOAJ |
| description | Graphitic phase carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) is a promising photocatalytic environmental material. For this study, the graphitic phase carbon nitride was prepared using a thermal polymerization method. The characteristic peaks, structures, and morphologies were determined using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and scanning electron microscopy (SEM), respectively. Under the synergetic visible light catalysis of H<sub>2</sub>O<sub>2</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>, the degradation effects of g-C<sub>3</sub>N<sub>4</sub> on the anionic dye methyl orange (MO) and the cationic dye rhodamine b (Rhb) were investigated. The effects of adding different volumes of H<sub>2</sub>O<sub>2</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> were likewise tested. The results showed that the above two synergistic systems increased the degradation rates of MO and Rhb by 2.5 and 3.5 times, respectively, compared with pure g-C<sub>3</sub>N<sub>4</sub>, and that the degradation rates of both MO and Rhb reached 100% within 120 min and 90 min, respectively, in accordance with the primary reaction kinetics. When H<sub>2</sub>O<sub>2</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> were added dropwise at 10 mL each, the degradation rates of MO and Rhb were 82.22% and 99.81%, respectively, after 30 min of open light. The results of experiments upon both zeta potential and radical quenching showed that ·OH and ·O<sub>2</sub><sup>−</sup> were the main active radicals for dye degradation in our synergistic system. In addition, stability tests showed that the photocatalysts in the synergistic system still had good reusability. Therefore, the use of a synergistic system can effectively reduce the photogenerated electron-hole pair complexation rate, representing a significant improvement in both photocatalytic degradation and for stability levels. |
| first_indexed | 2024-03-11T06:07:53Z |
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| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T06:07:53Z |
| publishDate | 2023-03-01 |
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| spelling | doaj.art-e7a73d6a34124d8d9df5b535e1910c392023-11-17T12:55:17ZengMDPI AGMolecules1420-30492023-03-01286279610.3390/molecules28062796Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon NitrideWen Yang0Kun Ding1Guangzhou Chen2Hua Wang3Xinyue Deng4College of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei 230601, ChinaCollege of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei 230601, ChinaCollege of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei 230601, ChinaCollege of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei 230601, ChinaCollege of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei 230601, ChinaGraphitic phase carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) is a promising photocatalytic environmental material. For this study, the graphitic phase carbon nitride was prepared using a thermal polymerization method. The characteristic peaks, structures, and morphologies were determined using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and scanning electron microscopy (SEM), respectively. Under the synergetic visible light catalysis of H<sub>2</sub>O<sub>2</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>, the degradation effects of g-C<sub>3</sub>N<sub>4</sub> on the anionic dye methyl orange (MO) and the cationic dye rhodamine b (Rhb) were investigated. The effects of adding different volumes of H<sub>2</sub>O<sub>2</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> were likewise tested. The results showed that the above two synergistic systems increased the degradation rates of MO and Rhb by 2.5 and 3.5 times, respectively, compared with pure g-C<sub>3</sub>N<sub>4</sub>, and that the degradation rates of both MO and Rhb reached 100% within 120 min and 90 min, respectively, in accordance with the primary reaction kinetics. When H<sub>2</sub>O<sub>2</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> were added dropwise at 10 mL each, the degradation rates of MO and Rhb were 82.22% and 99.81%, respectively, after 30 min of open light. The results of experiments upon both zeta potential and radical quenching showed that ·OH and ·O<sub>2</sub><sup>−</sup> were the main active radicals for dye degradation in our synergistic system. In addition, stability tests showed that the photocatalysts in the synergistic system still had good reusability. Therefore, the use of a synergistic system can effectively reduce the photogenerated electron-hole pair complexation rate, representing a significant improvement in both photocatalytic degradation and for stability levels.https://www.mdpi.com/1420-3049/28/6/2796g-C<sub>3</sub>N<sub>4</sub>photocatalysissynergistic multisystemanionic and cationic dyesdynamicszeta potential |
| spellingShingle | Wen Yang Kun Ding Guangzhou Chen Hua Wang Xinyue Deng Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon Nitride Molecules g-C<sub>3</sub>N<sub>4</sub> photocatalysis synergistic multisystem anionic and cationic dyes dynamics zeta potential |
| title | Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon Nitride |
| title_full | Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon Nitride |
| title_fullStr | Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon Nitride |
| title_full_unstemmed | Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon Nitride |
| title_short | Synergistic Multisystem Photocatalytic Degradation of Anionic and Cationic Dyes Using Graphitic Phase Carbon Nitride |
| title_sort | synergistic multisystem photocatalytic degradation of anionic and cationic dyes using graphitic phase carbon nitride |
| topic | g-C<sub>3</sub>N<sub>4</sub> photocatalysis synergistic multisystem anionic and cationic dyes dynamics zeta potential |
| url | https://www.mdpi.com/1420-3049/28/6/2796 |
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