Modification of Expandable Graphite and Adsorption for Methyl Orange

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Results of preparing expandable graphite through Microwave Expansion method with the material of expandable graphite made through the Chemical Oxidation process show that in the temperature range of 700°C~900°C, the volume of expandable graphite will bigger with the rise of temperature, reaching the maximum 203 ml/g at the temperature of 900°C. The expandable graphite of 900°C can be modified in 0.5M hydrochloric acid; at the temperature of 40°C and 6h later, decolourization ratio of methyl orange will reach 95%. If the graphite is modified in concentrated nitric acid with the temperature of 50°C for 6 hours, the decolourization rate will be 96%. In terms of cost, it is more economical to modify expandable graphite in hydrochloric acid.

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81-85

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August 2014

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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