Anchoring single-unit-cell defect-rich bismuth molybdate layers on ultrathin carbon nitride nanosheet with boosted charge transfer for efficient photocatalytic ciprofloxacin degradation
| Autor: | Mingming Zhang, Xigui Liu, Minfang Li, Ling Li, Chengcheng Chu, Bisheng Li, Cui Lai, Liang Chen, Lei Qin, Huan Yi, Shiyu Liu, Jiangfan He |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Light Metal Nanoparticles chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis Bismuth Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Ciprofloxacin Specific surface area Nitriles Carbon nitride Nanosheet Molybdenum Photolysis Heterojunction Photochemical Processes 021001 nanoscience & nanotechnology Anti-Bacterial Agents Nanostructures 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Chemical engineering Photocatalysis Degradation (geology) Charge carrier 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 560:701-713 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2019.10.116 |
| Popis: | Photocatalysis technology is regarded as a promising way for environmental remediation, but rationally designing photocatalysis system with high-speed interfacial charge transfer, sufficient photoabsorption and surface reactive sites is still a challenge. In this study, anchoring single-unit-cell defective Bi2MoO6 on ultrathin g-C3N4 to form 2D/2D heterostructure system is a triple-purpose strategy for high-performance photocatalysis. The defect structure broadens photo-responsive range. The large intimate contact interface area between two monomers promotes charges carrier transfer. The enhanced specific surface area exposes more reactive sites for mass transfer and catalytic reaction. As a result, the obtained heterostructure displays excellent photocatalytic performance for ciprofloxacin (CIP) (0.0126 min−1), which is 3.32 and 2.93 folds higher than Bi2MoO6 and g-C3N4. In addition, this heterostructure retains high-performance for actual wastewaters treatment, and it displays strong mineralization ability. And this heterojunction also exhibits excellent photostability based on cyclic experiment. Mechanism exploration reveals that hole, superoxide radical, and hydroxyl radical are chief reactive species toward CIP degradation, thereby a Z-scheme charge carrier transfer channel is proposed. In addition, the intermediates and degradation pathways of CIP are tracked by liquid chromatography-triple quadrupole tandem mass spectrometry (LCMS/MS) and three-dimensional excitation-emission matrix fluorescence spectroscopy (3D EEMs). This study paves new way to design and construct atomic level 2D/2D heterojunction system for environment remediation. |
| Databáze: | OpenAIRE |
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