Preparation of porous graphene/carbon nanotube composite and adsorption mechanism of methylene blue
| Autor: | Huang Yangfan, Wang Zhenyou, Jiameng Zhu, Huie Liu, Xiuxia Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Scanning electron microscope General Chemical Engineering Oxide General Physics and Astronomy 02 engineering and technology Carbon nanotube 010402 general chemistry 01 natural sciences law.invention symbols.namesake chemistry.chemical_compound Adsorption law General Materials Science General Environmental Science Diffractometer Graphene General Engineering Langmuir adsorption model 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering chemistry symbols General Earth and Planetary Sciences 0210 nano-technology Raman spectroscopy |
| Zdroj: | SN Applied Sciences. 1 |
| ISSN: | 2523-3971 2523-3963 |
| DOI: | 10.1007/s42452-018-0035-6 |
| Popis: | The graphene oxide (GO) and modified carbon nanotubes (MCNTs) were dispersed in water and mixed with toluene to form homogeneous emulsion, then the porous graphene–carbon nanotubes composites (MCG) were prepared through hydrothermal reaction. The adsorption mechanism of MCG was investigated by adsorption methylene blue. The morphology of MCG was analyzed by scanning electron microscope and transmission electron microscopy. It was found that MCG had rich micropore structures and MCNTs were interlaced on graphene sheets. The pore size of MCG can be effectively controlled by changing the volume ratio of toluene to the GO/MCNTs solution in the emulsion. MCG was characterized by X-ray diffractometer, Raman spectrometer, X ray photoelectric instrument and other analytical instruments. It was found that MCG had more oxygen functional groups. The experimental results show that kinetics can be well-described by pseudo-second-order model. The smaller the pore size, the higher the equilibrium adsorption capacity and the slower the adsorption rate. The adsorption thermodynamic parameters show that the adsorption process is spontaneous and belongs to physical adsorption, and high temperature is beneficial to adsorption. The fitting results of MCG-5 equilibrium adsorption data are matched with the Langmuir model and the saturated adsorption capacity is 232 mg g−1. After five cycles of adsorption–desorption operation, the adsorption capacity of MCG-5 decreases slightly. |
| Databáze: | OpenAIRE |
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