期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 415, 期 -, 页码 288-294出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2012.09.035
关键词
One-step hydrothermal preparation; Carbon spheres; Enhanced adsorption performance; Cr(VI) removal
资金
- National Natural Science Foundation of China [21001002, 21171004]
- China Postdoctoral Science Foundation [2011M501407]
- science foundation for doctor of Anhui University of Architecture [[2011]101]
A facile one-step hydrothermal approach to prepare carbon spheres with amino groups on their surface is reported in this work. The obtained products are composed of carbon spheres with uniform size similar to 2-3 mu m. It was found that the addition of ammonia in the precursor solution would lead to modification of amino groups on the surface of carbon spheres. The existence of amino groups was verified by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Importantly, the carbon spheres with amino groups showed an excellent enhanced adsorption performance for the removal of heavy metal anions. Their removal capacity of Cr(VI) is similar to 9 times higher than that of carbon spheres without amino groups. The enhanced adsorption performance was assumed to be induced by positively charged and increased reducing surface by modification of amino groups. This work not only supplies a novel low-cost approach to prepare amino-functionalized carbon spheres for water purification but also gives deep insight into understanding the adsorption behavior of carbon spheres. (C) 2012 Elsevier B.V. All rights reserved.
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