High-efficiency separation and purification method of graphite oxide
A technology for separation and purification of graphite, applied in the direction of graphite, etc., can solve the problems of cumbersome operation steps, long production cycle, and much pollution, and achieve the effect of broad application prospects, short production cycle, and less pollution
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[0020] Example 1: Measure a certain volume of deionized water and pour it into a beaker, stir at a temperature of 85°C at a speed of 150r / min, and weigh aluminum sulfate (Al(SO) according to the ratio of flocculant: deionized water=1g:200ml 4 ) 3 ·18H 2 O), slowly and uniformly add to the stirring deionized water to dissolve, stir for 30min, and then obtain the flocculant solution. According to 1000ppm (g / m 3 ) The flocculant solution was added to the graphite oxide suspension at a uniform speed, stirred for 0.5 min, and allowed to stand for 20 min to obtain stable graphite oxide flocs, and the suspension layering phenomenon was observed. Vacuum filtration of the supernatant and solids to obtain graphite oxide with high solid content. Add deionized water again, repeat the vacuum filtration process 8 times after mixing uniformly, until the pH value of the filtrate reaches 7.6, that is, 99.8% high-purity graphite oxide is obtained.
Example Embodiment
[0021] Example 2: Measure a certain volume of deionized water and pour it into a beaker, stir at a speed of 800r / min at 65°C, weigh polyferric sulfate (PFS) according to the ratio of flocculant: deionized water 1g:1000ml, Slowly and evenly add to stirring deionized water to dissolve, stir for 2 hours, and then obtain the flocculant solution. According to 600ppm(g / m 3 ) The flocculant solution was added to the graphite oxide suspension at a uniform speed, stirred for 10 minutes, and allowed to stand for 60 minutes to obtain stable graphite oxide flocs, and the suspension layering phenomenon was observed. Centrifugal separation of the supernatant and solids to obtain high-solid graphite oxide. Add deionized water again, repeat the centrifugal separation process 7 times after mixing uniformly, until the pH value of the filtrate reaches 7.2, that is, 99.5% high-purity graphite oxide is obtained.
Example Embodiment
[0022] Example 3: Measure a certain volume of deionized water and pour it into a beaker, stir at 1200r / min at a temperature of 55°C, weigh polyaluminum ferric chloride (PAFC) according to the ratio of flocculant: deionized water 1g: 2000ml ), slowly and uniformly add to stirring deionized water to dissolve, stir for 4 hours, and then obtain the flocculant solution. According to 200ppm(g / m 3 ) The flocculant solution was added to the graphite oxide suspension at a uniform speed, stirred for 30 minutes, and allowed to stand for 4 hours to obtain stable graphite oxide flocs, and the suspension layering phenomenon was observed. Centrifugal separation of the supernatant and solids to obtain graphite oxide with high solid content. Add deionized water again, repeat the above physical separation process 4 times after mixing uniformly, until the pH value of the filtrate reaches 6.2, that is, 98.7% high-purity graphite oxide is obtained.
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