Carbon dots rooted PVDF membrane for fluorescence detection of heavy metal ions
| Autor: | Xia Feng, Wenzhe Jiang, Yiping Zhao, Yao Dong, Dongdong Zhang, Chen Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Materials science Metal ions in aqueous solution General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Surfaces Coatings and Films Metal Membrane X-ray photoelectron spectroscopy chemistry Transmission electron microscopy visual_art visual_art.visual_art_medium 0210 nano-technology Carbon |
| Zdroj: | Applied Surface Science. 494:635-643 |
| ISSN: | 0169-4332 |
| Popis: | PVDF-g-PAA-CDs composite membrane with stable fluorescence was prepared by grafting carbon dots (CDs) onto the surface of PVDF-g-PAA membrane through amidation reaction for the first time. The results of Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and fluorescence properties clearly showed the formation of CDs with a strong blue fluorescence under UV light, which was ascribed to the influence of surface functional groups or edge defects. The effect of CDs on the surface composition, morphology, hydrophilicity and pure water flux of PVDF-g-PAA-CDs composite membranes was investigated. Consistent with CDs, PVDF-g-PAA-CD composite membrane also exhibits photoluminescence behavior that is dependent on excitation. The addition of CDs gives the composite membrane a significant fluorescence quenching effect on Cu2+, Hg2+ and Fe3+ without being affected by K+, Na+, Cl−. This may be because the complexation of Cu2+, Hg2+ and Fe3+ with coordination bonds such as -NH2 and -COOH on CDs surface can accelerate the extinction of electron/hole non-radiative recombination through effective electron or energy transfer, leading to fluorescence quenching of CDs on the surface of PVDF-g-PAA-CD composite membrane. Furthermore, the optical detection limit of the respective metal ion is found to be 1 nmol/L for Cu2+ and Hg2+ and 1 μmol/L for Fe3+ by studying the changes in fluorescence spectra of PVDF-g-PAA-CD composite membrane. In summary, PVDF-g-PAA-CDs fluorescent composite membrane has the advantages of fast, stable, environmentally friendly, simple, and inexpensive as a solid platform for heavy metal ion detection, and has great potential in the field of water purification. |
| Databáze: | OpenAIRE |
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