期刊
CHEMICAL ENGINEERING JOURNAL
卷 361, 期 -, 页码 547-558出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.12.081
关键词
Nitrogen doping; Magnetic; Carbon nanotubes; Cr(VI) removal; Electrochemical reduction
资金
- National Natural Science Foundation of China [21503082]
- Science and Technology Program of Guangzhou City [201804010112]
- China Postdoctoral Science Foundation [2018M633053]
- Fundamental Research Funds for the Central Universities of China [2018MS37]
Highly efficient and acid-corrosion resistant for carbon adsorbent in hexavalent chromium removal is a significant property in the practical application. In this study, nitrogen doped carbon nanotubes with encapsulated Fe and Fe3C were synthesized through a facile pyrolysis procedure using melamine and ferric chloride as precursors, displaying an excellent efficiency and stability for hexavalent chromium removal. High maximum removal capacities with 35.26 and 970.87 mg g(-1) were obtained in neutral and acid solutions, respectively, due to the adsorption process, reduction reaction between Fe-0 or Fe2+ nanoparticles and Cr(VI) ions. The unexpected high stability in acid solution (pH at 1) after five recycles was observed for the first time, ascribed to N doping and the tubular structure with encapsulated ferric carbide, which could be resistant to the acid corrosion. After a simple treatment, the used adsorbent could be re-utilized as catalysts for the electrochemical reduction of CO2 with high faradic efficiency (over 90% total efficiency and about 50% for CO production at -0.6 V), demonstrating a promising potential for reutilizing the used carbon adsorbents.
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