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Graphite (1 g) was prior ground with NaCl (50 g) for 10 min. Then the NaCl was dissolved in water and removed by filtration. After being washed with deionized
water several times, the remaining graphite was stirred in 23 mLof concentrated H
2SO4 for 8 h. Then, 3 g of KMnO4 was slowly added while keeping the round-bottom flask in an ice bath.Subsequently, the mixture was stirred at 35¨C40C for 30 min, then at 65¨C80C for 45 min. Next, 46 mL of water was added into the mixture and heated at 98¨C105C for 30 min. The reac-tion was terminated by addition of distilled water (140 mL) and 30% H2O2 solution (10 mL), causing the color of the suspension to turn bright yellow. The products were washed with 5% HCl and then with deionized water by repeated centrifugation.
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