A novel biodegradable porous graphitic carbon nitride/poly(lactic acid) fiber photocatalyst for efficient elimination of carbamazepine under solar irradiation
| Autor: | Junting Gao, Wenxing Chen, Wangyang Lu, Nan Li, Tiefeng Xu, Zhexin Zhu, Fangfang Yang, Mengxia Qian, Xiufang Chen |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Singlet oxygen General Chemical Engineering Graphitic carbon nitride 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound Wastewater chemistry Chemical engineering Polylactic acid Photocatalysis Environmental Chemistry Degradation (geology) Fiber 0210 nano-technology Mesoporous material |
| Zdroj: | Chemical Engineering Journal. 414:128845 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2021.128845 |
| Popis: | Developing efficient photocatalytic materials for the elimination of emerging contaminants is of great significance for wastewater treatment. However, photocatalysts in powder form usually suffer from the problems of easy agglomeration and difficult recycle in water. Herein, graphitic carbon nitride/polylactic acid (g-C3N4/PLA) fiber composites with highly hierarchical macro/mesoporous structure were constructed by a simple and efficient methods of centrifugal-electrostatic spinning and alkali treatment. The porous structure of fiber could provide abundant space to immobilize g-C3N4 nanosheets, avoiding the wrapping of g-C3N4 inside the fiber and creating more active sites for photocatalytic reaction. Importantly, the carbamazepine (CBZ) removal rate by porous g-C3N4/PLA fiber composites under solar irradiation was as high as 99% in 2 h. The reaction mechanisms and CBZ degradation pathways were identified. Superoxide radical (•O2−), singlet oxygen (1O2) and hole (h+) were regarded as dominant active species in porous g-C3N4/PLA photocatalytic system for photocatalytic degradation of CBZ. The porous fiber composites not only possessed superior photocatalytic activity, repeatability and stability, but also could be biodegraded in natural environment without secondary pollution. This work proposed a promising way for developing efficient, stable and environmental-friendly photocatalytic materials for the removal of CBZ and other emerging contaminants in wastewater. |
| Databáze: | OpenAIRE |
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