Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> Composites
N- and S-doped CQDs were prepared using L-cysteine as a precursor. Different NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> composite photocatalysts were formed by modifying graphite-phase carbon nitride with different contents of NS-CQDs using a hydrothermal method. The morphology, co...
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| Format: | Article |
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MDPI AG
2023-11-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/14/12/2143 |
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| author | Yu Wang Hongyue Chen Zijian Jia Jingxue Lv Yuguang Lv Jiang Wu |
| author_facet | Yu Wang Hongyue Chen Zijian Jia Jingxue Lv Yuguang Lv Jiang Wu |
| author_sort | Yu Wang |
| collection | DOAJ |
| description | N- and S-doped CQDs were prepared using L-cysteine as a precursor. Different NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> composite photocatalysts were formed by modifying graphite-phase carbon nitride with different contents of NS-CQDs using a hydrothermal method. The morphology, constituent elements and functional groups of the composite photocatalysts were analyzed by SEM, EDS, TEM, Mapping, XRD and FT-IR as a proof of its successful preparation. Meanwhile, it was characterized by PL, UV-Vis DRS and electrochemical impedance, which proved that the CQDs could be used as an electronic memory in the composite system to accelerate the electron transfer induced by the photo-excitation of g-C<sub>3</sub>N<sub>4</sub> and effectively inhibit the recombination of e<sup>−</sup>-h<sup>+</sup> improvement of the photocatalytic activity of g-C<sub>3</sub>N<sub>4</sub>. The stability of the composite photocatalysts under different conditions and the photodegradation activity of Rh B under visible light were investigated. It was found that the photocatalytic degradation efficiency of rhodamine B by NS-CQDS-modified g-C<sub>3</sub>N<sub>4</sub> was significantly higher than that of pure g-C<sub>3</sub>N<sub>4</sub>, which could reach 90.82%, and its degradation rate was 3.5 times higher than that of pure g-C<sub>3</sub>N<sub>4</sub>. It was demonstrated by free radical trapping experiments that ·OH and ·O<sub>2</sub><sup>−</sup> were the main active species in the photocatalytic degradation process, in which ·O<sub>2</sub><sup>−</sup> played a guiding role. |
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| language | English |
| last_indexed | 2024-03-08T20:31:37Z |
| publishDate | 2023-11-01 |
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| series | Micromachines |
| spelling | doaj.art-13d6458ac29f4325ba5948655f9ba5c62023-12-22T14:25:12ZengMDPI AGMicromachines2072-666X2023-11-011412214310.3390/mi14122143Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> CompositesYu Wang0Hongyue Chen1Zijian Jia2Jingxue Lv3Yuguang Lv4Jiang Wu5College of Pharmacy, Jiamusi University, Jiamusi 154007, ChinaCollege of Pharmacy, Jiamusi University, Jiamusi 154007, ChinaSchool of Stomatology, Jiamusi University, Jiamusi 154007, ChinaCollege of Pharmacy, Jiamusi University, Jiamusi 154007, ChinaCollege of Pharmacy, Jiamusi University, Jiamusi 154007, ChinaSchool of Stomatology, Jiamusi University, Jiamusi 154007, ChinaN- and S-doped CQDs were prepared using L-cysteine as a precursor. Different NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> composite photocatalysts were formed by modifying graphite-phase carbon nitride with different contents of NS-CQDs using a hydrothermal method. The morphology, constituent elements and functional groups of the composite photocatalysts were analyzed by SEM, EDS, TEM, Mapping, XRD and FT-IR as a proof of its successful preparation. Meanwhile, it was characterized by PL, UV-Vis DRS and electrochemical impedance, which proved that the CQDs could be used as an electronic memory in the composite system to accelerate the electron transfer induced by the photo-excitation of g-C<sub>3</sub>N<sub>4</sub> and effectively inhibit the recombination of e<sup>−</sup>-h<sup>+</sup> improvement of the photocatalytic activity of g-C<sub>3</sub>N<sub>4</sub>. The stability of the composite photocatalysts under different conditions and the photodegradation activity of Rh B under visible light were investigated. It was found that the photocatalytic degradation efficiency of rhodamine B by NS-CQDS-modified g-C<sub>3</sub>N<sub>4</sub> was significantly higher than that of pure g-C<sub>3</sub>N<sub>4</sub>, which could reach 90.82%, and its degradation rate was 3.5 times higher than that of pure g-C<sub>3</sub>N<sub>4</sub>. It was demonstrated by free radical trapping experiments that ·OH and ·O<sub>2</sub><sup>−</sup> were the main active species in the photocatalytic degradation process, in which ·O<sub>2</sub><sup>−</sup> played a guiding role.https://www.mdpi.com/2072-666X/14/12/2143CQDs/g-C<sub>3</sub>N<sub>4</sub>rhodamine Bphotocatalytic activity |
| spellingShingle | Yu Wang Hongyue Chen Zijian Jia Jingxue Lv Yuguang Lv Jiang Wu Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> Composites Micromachines CQDs/g-C<sub>3</sub>N<sub>4</sub> rhodamine B photocatalytic activity |
| title | Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> Composites |
| title_full | Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> Composites |
| title_fullStr | Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> Composites |
| title_full_unstemmed | Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> Composites |
| title_short | Analysis of Photocatalytic Properties of NS-CQDs/g-C<sub>3</sub>N<sub>4</sub> Composites |
| title_sort | analysis of photocatalytic properties of ns cqds g c sub 3 sub n sub 4 sub composites |
| topic | CQDs/g-C<sub>3</sub>N<sub>4</sub> rhodamine B photocatalytic activity |
| url | https://www.mdpi.com/2072-666X/14/12/2143 |
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