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| Preparation,Characterization,Dye Adsorption of a Novel N-doped Porous Carbon |
| Received:August 15, 2015 |
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| KeyWord:crop stalk;N-doped carbon;physicochemical property;acid orange 7;adsorption capacity |
| Author Name | Affiliation | E-mail | | CUI Guan-nan | College of Life Science, Tianjin Normal University, Tianjin 300387, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIU Zhong-qi | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | SONG Zheng-guo | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | DUO Li-an | College of Life Science, Tianjin Normal University, Tianjin 300387, China | | | GAO Zi-ping | College of Life Science, Tianjin Normal University, Tianjin 300387, China | | | YIN Jie | College of Life Science, Tianjin Normal University, Tianjin 300387, China | | | LIAN Fei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | lianfei2000@gmail.com,lianfei2000@126.com |
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| Abstract: |
| A novel N-doped porous carbon was produced from corn stalks with NH3 gas as activator. Its characterization was investigated using N2 adsorption/desorption, X-ray photoelectron spectroscopy(XPS), Raman spectroscopy, and Fourier transform infrared spectroscopy(FTIR). Its adsorption of acid orange 7(AO7, as a model dye) was also examined.Results showed that increasing annealing temperature from 600 ℃ to 800 ℃ increased N content in the porous carbon from 3.2% to 8.81%, BET surface area from 72.7 m2·g-1 to 418.7 m2·g-1, and microporosity degree(ratio of Vm/Vt) from 16.0% to 71.5%. This porous carbon exhibited high dye adsorption capacity, with AO7 adsorption up to 292 mg·g-1, greater than that of many common carbonaceous adsorbents.The adsorption isotherms for AO7 could be well fitted by Freundlich model,implying that the dye adsorption probably occurred on heterogeneous surfaces in a multi-layer manner.The mechanisms of dye adsorption by the carbon were dominated by chemical interactions, probably including electrostatic attraction, π-π electron donor-accepter interaction, and Lewis acid-base interaction. These results demonstrate that the N-doped porous carbon has large BET surface area, well-developed microporosity and high adsorption capacity,thus exhibiting wide applications in various aspects. |
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