Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and Mechanism
In recent years, with the large-scale use of antibiotics, the pollution of antibiotics in the environment has become increasingly serious and has attracted widespread attention. In this study, a novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> (CDBPC) compo...
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MDPI AG
2022-07-01
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| Online Access: | https://www.mdpi.com/2073-4344/12/7/774 |
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| author | Wei Qian Wangtong Hu Zhifei Jiang Yongyi Wu Zihuan Li Zenghui Diao Mingyu Li |
| author_facet | Wei Qian Wangtong Hu Zhifei Jiang Yongyi Wu Zihuan Li Zenghui Diao Mingyu Li |
| author_sort | Wei Qian |
| collection | DOAJ |
| description | In recent years, with the large-scale use of antibiotics, the pollution of antibiotics in the environment has become increasingly serious and has attracted widespread attention. In this study, a novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> (CDBPC) composite was successfully synthesized by a hydrothermal method for the removal of the antibiotic tetracycline hydrochloride (TC) in water. The experimental results showed that the synthesized photocatalyst was crystalline rods and cotton balls, accompanied by overlapping layered nanosheet structures, and the specific surface area was as high as 518.50 m<sup>2</sup>/g. This photocatalyst contains g-C<sub>3</sub>N<sub>4</sub> and bismuth phosphate (BiPO<sub>4</sub>) phases, as well as abundant surface functional groups such as C=N, C-O, and P-O. When the optimal conditions were pH 4, CDBPC dosage of 1 g/L, and TC concentration of 10 mg/L, the degradation rate of TC reached 75.50%. Active species capture experiments showed that the main active species in this photocatalytic system were holes (h<sup>+</sup>), hydroxyl radicals, and superoxide anion radicals. The reaction mechanism for the removal of TC by CDBPC was also proposed. The removal of TC was mainly achieved by the synergy between the adsorption of CDBPC and the oxidation of both holes and hydroxyl radicals. In this system, TC was adsorbed on the surface of CDBPC, and then the adsorbed TC was degraded into small molecular products by an attack with holes and hydroxyl radicals and finally mineralized into carbon dioxide and water. This study indicated that this novel photocatalyst CDBPC has a huge potential for antibiotic removal, which provides a new strategy for antibiotic treatment of wastewater. |
| first_indexed | 2024-03-09T03:35:09Z |
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| language | English |
| last_indexed | 2024-03-09T03:35:09Z |
| publishDate | 2022-07-01 |
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| series | Catalysts |
| spelling | doaj.art-07590db4da78447e817e4afbcb0369082023-12-03T14:49:08ZengMDPI AGCatalysts2073-43442022-07-0112777410.3390/catal12070774Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and MechanismWei Qian0Wangtong Hu1Zhifei Jiang2Yongyi Wu3Zihuan Li4Zenghui Diao5Mingyu Li6School of Environment, Jinan University, Guangzhou 510632, ChinaCollege of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaHuafeng Bijiang Environmental Protection Technology Co., Ltd., Zhaoqing 526108, ChinaCollege of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaCollege of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaCollege of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaSchool of Environment, Jinan University, Guangzhou 510632, ChinaIn recent years, with the large-scale use of antibiotics, the pollution of antibiotics in the environment has become increasingly serious and has attracted widespread attention. In this study, a novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> (CDBPC) composite was successfully synthesized by a hydrothermal method for the removal of the antibiotic tetracycline hydrochloride (TC) in water. The experimental results showed that the synthesized photocatalyst was crystalline rods and cotton balls, accompanied by overlapping layered nanosheet structures, and the specific surface area was as high as 518.50 m<sup>2</sup>/g. This photocatalyst contains g-C<sub>3</sub>N<sub>4</sub> and bismuth phosphate (BiPO<sub>4</sub>) phases, as well as abundant surface functional groups such as C=N, C-O, and P-O. When the optimal conditions were pH 4, CDBPC dosage of 1 g/L, and TC concentration of 10 mg/L, the degradation rate of TC reached 75.50%. Active species capture experiments showed that the main active species in this photocatalytic system were holes (h<sup>+</sup>), hydroxyl radicals, and superoxide anion radicals. The reaction mechanism for the removal of TC by CDBPC was also proposed. The removal of TC was mainly achieved by the synergy between the adsorption of CDBPC and the oxidation of both holes and hydroxyl radicals. In this system, TC was adsorbed on the surface of CDBPC, and then the adsorbed TC was degraded into small molecular products by an attack with holes and hydroxyl radicals and finally mineralized into carbon dioxide and water. This study indicated that this novel photocatalyst CDBPC has a huge potential for antibiotic removal, which provides a new strategy for antibiotic treatment of wastewater.https://www.mdpi.com/2073-4344/12/7/774carbon dotsphotocatalysisgraphitic carbon nitridebismuth phosphatetetracycline hydrochloride |
| spellingShingle | Wei Qian Wangtong Hu Zhifei Jiang Yongyi Wu Zihuan Li Zenghui Diao Mingyu Li Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and Mechanism Catalysts carbon dots photocatalysis graphitic carbon nitride bismuth phosphate tetracycline hydrochloride |
| title | Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and Mechanism |
| title_full | Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and Mechanism |
| title_fullStr | Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and Mechanism |
| title_full_unstemmed | Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and Mechanism |
| title_short | Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C<sub>3</sub>N<sub>4</sub>/BiPO<sub>4</sub> under Visible-Light Irradiation: Reactivity and Mechanism |
| title_sort | degradation of tetracycline hydrochloride by a novel cds g c sub 3 sub n sub 4 sub bipo sub 4 sub under visible light irradiation reactivity and mechanism |
| topic | carbon dots photocatalysis graphitic carbon nitride bismuth phosphate tetracycline hydrochloride |
| url | https://www.mdpi.com/2073-4344/12/7/774 |
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