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| Characterization of adsorption of methylene blue by Cu/CuO-modified carbon nanotubes |
| Received:December 22, 2017 |
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| KeyWord:carbon nanotubes;adsorption;methylene blue;Cu/CuO |
| Author Name | Affiliation | E-mail | | LI De-yun | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | | | LIU Long-fei | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | | | LI Cheng-liang | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | chengliang_li11@163.com | | WU Ke-yan | College of Agriculture, Guizhou University, Guiyang 550025, China | |
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| Abstract: |
| The adsorption characteristics of methylene blue in both Cu/CuO-modified and pristine carbon nanotubes were evaluated using a batch technique. Both the modified and pristine carbon nanotubes were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and the specific surface area was determined via a pore size analyzer. Using methylene blue as the absorbent, the effects of reaction time, temperature, pH, and ionic strength on the adsorption by the modified and pristine carbon nanotubes were investigated. Results showed that the pseudo-second-order equation was more suitable for the adsorption kinetics than the pseudo-first-order equation. The adsorption equilibrium was reached in about 2 h. The adsorption isotherms of the two kinds of carbon nanotubes conformed to the Freundlich model. The adsorption capacity of the carbon nanotubes increased with increasing pH and ionic strength in the medium. However, the adsorption capacity of the carbon nanotubes decreased as the temperature increased. Our results indicate that the adsorption mechanisms mainly include hydrophobicity interaction, electrostatic interaction, and complexation between copper and methylene blue. |
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