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2Â¥2013-03-26 17:00:30
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àÅ ÎÒÊǰ´Õâ¸ö·½·¨×öµÄ ¿ÉÊǾÍÒ»²½²½µÄ½á¹ûÀ´¿´ ¸úÕâ¸öÏà²îºÜ´óÊÇÔõô»ØÊ£¿natural graphite powder (2.0 g) was added to cooled (0 ◦C) H2SO4 (350 ml). Then, KMnO4 (20 g) and NaNO3 (3 g) were added gradually while stirring. The mixture was then transferred to a 30◦C water bath and stirred for 20 min. Deionized water (250 ml) was slowly added and the temperature was increased to 98 ◦C. The mixture was maintained at that temperature for 30 min. The reaction was terminated by adding de-ionized water (500 ml) followed by adding H2O2 solution (40 ml, 30%). The color of the mixture changed to brilliant yellow, indicating the oxidation of pristine graphite to GO. Then, the mixture was filtered and washed with diluted HCl to remove metal ions. Finally, the product was washed repeatedly with distilled water until the pH was seven. The sample of GO was obtained after drying. To prepare the GONS, the as-obtained GO was re-dispersed in distilled water¡£ |
3Â¥2013-03-26 19:07:29













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