Highly crystalline lithium chloride-intercalated graphitic carbon nitride hollow nanotubes for effective lead removal
| Autor: | Changzhong Liao, Yiang Fan, Shengshou Ma, Minhua Su, Kaimin Shih, Ying Zhou, Ying-Rui Lu, Zhengyuan Zhou, Ting-Shan Chan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Materials Science (miscellaneous) Intercalation (chemistry) Graphitic carbon nitride 02 engineering and technology 010501 environmental sciences Nitride 021001 nanoscience & nanotechnology 01 natural sciences chemistry.chemical_compound Adsorption chemistry Chemical engineering Chemisorption Lithium chloride Chemical binding 0210 nano-technology Carbon nitride 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Environmental Science: Nano. 6:3324-3335 |
| ISSN: | 2051-8161 2051-8153 |
| DOI: | 10.1039/c9en00817a |
| Popis: | The functional groups and intercalated ions in the structure of graphitic carbon nitrides can be tailored to attain excellent physiochemical properties for environmental remediation. In this work, a highly crystallized lithium chloride-intercalated graphitic carbon nitride (LiCl-CN) material was fabricated through well-controlled molten salt synthesis. The as-prepared materials presented hollow tube morphology with tetragonal geometric configurations. Batch adsorption experiments showed that the LiCl-intercalated graphitic carbon nitride (LiCl-CN-4 h) exhibited excellent lead cation (Pb(II)) adsorption capacity (172.41 mg g−1) at pH 5.5. Thermodynamic parameters revealed the endothermic and spontaneous nature of Pb(II) adsorption on LiCl-CN-4 h, and the kinetics results demonstrated that chemisorption dominated the adsorption process. X-ray diffraction analysis indicated that the intercalation of Cl and Li can lead to a larger interlayer spacing between carbon nitride layers. An X-ray photoelectron spectroscopy and X-ray absorption spectroscopy investigation further elucidated the chemical binding sites of Cl–Pb in the lattice of LiCl-CN, indicating the intercalation of Cl− ions contributed to the large improvement of Pb(II) adsorption capacity in g-C3N4 materials. The experimental results demonstrate that this is a facile and environmentally friendly strategy for synthesizing highly crystalline LiCl-CN with hollow tube morphology, and that the material showed promise for efficient Pb(II) removal in environmental remediation applications. |
| Databáze: | OpenAIRE |
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