Three-dimensional magnetic graphitic carbon nitride composites as high-performance adsorbent for removal Pb2+ from aqueous solution
| Autor: | Zhigang Dan, Shuangzhen Guo, Feifei Shi, Ning Duan, Chenmu Zhang, Fuyuan Xu, Wubin Gao |
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| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Materials science Heptazine Scanning electron microscope General Chemical Engineering Metal ions in aqueous solution Graphitic carbon nitride Langmuir adsorption model 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound symbols.namesake Adsorption chemistry Chemical engineering symbols Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | Journal of the Taiwan Institute of Chemical Engineers. 89:169-182 |
| ISSN: | 1876-1070 |
| DOI: | 10.1016/j.jtice.2018.05.012 |
| Popis: | Three-Dimensional magnetic nanocomposite (Fe3O4@g-C3N4) was first prepared and used to removal Pb2+ from aqueous solution by adsorption method. Various of techniques were used to character Fe3O4@g-C3N4 such as scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and thermo-gravimetric analyzer (TGA). Batch experiments with different pH, initial concentration, contact time and ionic strength were used to evaluate the adsorption performance of Fe3O4@g-C3N4. The adsorption kinetics data followed pseudo-second-order model. The isothermal adsorption equilibrium data were best described by Langmuir model and predicated adsorption capacity was 423.73 mg g−1 for Pb2+. The result of X-ray photoelectron spectroscopy (XPS) survey spectrum suggested that the main adsorption mechanism of Fe3O4@g-C3N4 for Pb2+ is the coordination between conjugated π-electron pairs of heptazine (C6N7) units or triazine ring (C3N3) units and sp2 C N with metal ions. By comparing the adsorption capacities of Fe3O4, g-C3N4 and Fe3O4@g-C3N4, it can be found that the adsorption capacity of g-C3N4 would increase by increasing the layer spacing. Fe3O4@g-C3N4 could be regenerated by HNO3 and the adsorption capacity of regenerative Fe3O4@g-C3N4 could maintain 89.3% after five cycles. The adsorption capacity of Fe3O4@g-C3N4 for Pb2+ is 121.42 mg g−1 in acid electrolytic zinc residue percolate. Therefore, the Fe3O4@g-C3N4 is a potential adsorbent for removing Pb2+ from wastewater. |
| Databáze: | OpenAIRE |
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