High-efficiency adsorption for both cationic and anionic dyes using graphene nanoribbons formed by atomic-hydrogen induced single-walled carbon nanotube carpets
| Autor: | Liantuan Xiao, Yan Gao, Chengbing Qin, Liang Wu, Shanxia Bao, Lele Qi, Shuangping Han, Guofeng Zhang, Xilong Liang, Qiang Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 01 natural sciences law.invention Inorganic Chemistry symbols.namesake Adsorption law Materials Chemistry Molecule Renewable Energy Sustainability and the Environment Process Chemistry and Technology Organic Chemistry Cationic polymerization Langmuir adsorption model 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering chemistry Ceramics and Composites symbols Surface modification 0210 nano-technology Graphene nanoribbons |
| Zdroj: | Carbon Letters. 30:123-132 |
| ISSN: | 2233-4998 1976-4251 |
| Popis: | Carbonaceous materials are considered as potential adsorbents for organic dyes due to their unique structures which provide high aspect ratios, hydrophobic property, large efficient surface area, and easy surface modification. In this work, graphene nanoribbons (GNRs) were prepared by atomic hydrogen-induced treatment of single-walled carbon nanotube (SWCNTs), which inspire the idea of cutting and unzipping the SWCNTs carpets with the modified in molecules prevent because of the unfolding of the side-walls. The unfolded spaces and uniform vertical arrangement not only enhance the active surface area, but also promote the electrostatic and π–π interactions between dyes and GNRs. The improved adsorption capacity of GNRs beyond original SWCNTs can be determined by the adsorption kinetics and isotherm, which are evaluated through adsorption batch experiments of the typical cationic methylene blue (MB) and anionic orange II (OII) dye, respectively. It is shown that the adsorption kinetics follow a pseudo second-order model while the adsorption isotherm could be determined by Langmuir model. The results reveal that the maximum adsorption capacities of GNRs for MB and OII are 280 and 265 mg/g, respectively. The GNRs present the highly efficient, cost effective, and environmental friendly properties for the commercial applications of wastewater treatment. |
| Databáze: | OpenAIRE |
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