Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes
Magnetic multi-wall carbon nanotubes were prepared with wet chemical treatments and characterized by a transmission electron microscope (TEM) and X-ray diffraction (XRD). They were used as adsorbents for the removal of Cr(VI) in aqueous solutions. The effects of adsorbent dosage, the concentration o...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2015-07-01
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| Series: | Water Science and Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674237015000538 |
| _version_ | 1828824612436180992 |
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| author | Zhuo-nan Huang Xiao-ling Wang De-suo Yang |
| author_facet | Zhuo-nan Huang Xiao-ling Wang De-suo Yang |
| author_sort | Zhuo-nan Huang |
| collection | DOAJ |
| description | Magnetic multi-wall carbon nanotubes were prepared with wet chemical treatments and characterized by a transmission electron microscope (TEM) and X-ray diffraction (XRD). They were used as adsorbents for the removal of Cr(VI) in aqueous solutions. The effects of adsorbent dosage, the concentration of Cr(VI) in aqueous solution, temperature, and pH value on the removal efficiency were studied. Results showed that the adsorption capacity of the magnetic multi-wall carbon nanotubes increased with the initial Cr(VI) concentration, but decreased with the increase of adsorbent dosage. The adsorption amount increased with contact time. The adsorption kinetics were best represented by the pseudo second-order kinetic model, and the adsorption isotherms indicated that the Langmuir model better reflected the adsorption process. The obtained calculation results for the Gibbs free energy revealed that the adsorption was a spontaneous and endothermic process. The enthalpy deviation was 3.835 kJ·mol−1. The magnetic multi-wall carbon nanotubes showed significant potential for application in adsorption of heavy metal ions. |
| first_indexed | 2024-12-12T13:59:47Z |
| format | Article |
| id | doaj.art-6f5e2ddb32b94205a12a18e00245a383 |
| institution | Directory Open Access Journal |
| issn | 1674-2370 |
| language | English |
| last_indexed | 2024-12-12T13:59:47Z |
| publishDate | 2015-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Water Science and Engineering |
| spelling | doaj.art-6f5e2ddb32b94205a12a18e00245a3832022-12-22T00:22:21ZengElsevierWater Science and Engineering1674-23702015-07-018322623210.1016/j.wse.2015.01.009Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubesZhuo-nan Huang0Xiao-ling Wang1De-suo Yang2Key Laboratory for Phytochemistry of Shaanxi Province, Baoji University of Arts and Sciences, Shaanxi 721013, PR ChinaKey Laboratory for Phytochemistry of Shaanxi Province, Baoji University of Arts and Sciences, Shaanxi 721013, PR ChinaKey Laboratory for Phytochemistry of Shaanxi Province, Baoji University of Arts and Sciences, Shaanxi 721013, PR ChinaMagnetic multi-wall carbon nanotubes were prepared with wet chemical treatments and characterized by a transmission electron microscope (TEM) and X-ray diffraction (XRD). They were used as adsorbents for the removal of Cr(VI) in aqueous solutions. The effects of adsorbent dosage, the concentration of Cr(VI) in aqueous solution, temperature, and pH value on the removal efficiency were studied. Results showed that the adsorption capacity of the magnetic multi-wall carbon nanotubes increased with the initial Cr(VI) concentration, but decreased with the increase of adsorbent dosage. The adsorption amount increased with contact time. The adsorption kinetics were best represented by the pseudo second-order kinetic model, and the adsorption isotherms indicated that the Langmuir model better reflected the adsorption process. The obtained calculation results for the Gibbs free energy revealed that the adsorption was a spontaneous and endothermic process. The enthalpy deviation was 3.835 kJ·mol−1. The magnetic multi-wall carbon nanotubes showed significant potential for application in adsorption of heavy metal ions.http://www.sciencedirect.com/science/article/pii/S1674237015000538Magnetic multi-wall carbon nanotubesCr(VI)AdsorptionKineticsThermodynamics |
| spellingShingle | Zhuo-nan Huang Xiao-ling Wang De-suo Yang Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes Water Science and Engineering Magnetic multi-wall carbon nanotubes Cr(VI) Adsorption Kinetics Thermodynamics |
| title | Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes |
| title_full | Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes |
| title_fullStr | Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes |
| title_full_unstemmed | Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes |
| title_short | Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes |
| title_sort | adsorption of cr vi in wastewater using magnetic multi wall carbon nanotubes |
| topic | Magnetic multi-wall carbon nanotubes Cr(VI) Adsorption Kinetics Thermodynamics |
| url | http://www.sciencedirect.com/science/article/pii/S1674237015000538 |
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