A kind of preparation method that can directly wash graphite oxide with water
A water washing and graphite technology, applied in chemical instruments and methods, graphite, carbon compounds, etc., can solve the problems of restricting the development of graphite oxide, difficult to industrial scale, unable to directly wash to obtain neutral graphite oxide, etc. Range of motion, structural optimization, effect of avoiding breakage
Active Publication Date: 2020-12-11
SHANGHAI LEVSON ENTERPRISE GRP
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[0003] In summary, none of the existing graphite oxide preparation methods can obtain neutral graphite oxide through direct washing, which consumes a lot of manpower and material resources in actual operation, and is difficult to industrial scale, which severely limits the development of graphite oxide
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[0058] The present invention will be further described below in conjunction with the accompanying drawings.
[0059] see figure 1, figure 2 , a method for preparing graphite oxide that can be directly washed with water, comprising the following steps, step 1, using flake graphite as a raw material, adding a main intercalation agent and an auxiliary intercalation agent for intercalation treatment, and intercalating at 0-45°C React for 0.1-20h to obtain graphite intercalation compound; the main intercalation agent is at least one of formic acid, acetic acid, phosphoric acid, concentrated nitric acid, and concentrated sulfuric acid; the auxiliary intercalation agent is a 30% aqueous hydrogen peroxide solution with a concentration of 90% performic acid, the concentration is at least one of 50% peracetic acid; step 2, after the graphite intercalation compound is filtered to remove excess main intercalation agent and auxiliary intercalation agent, put it into ice water, filter and...
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Abstract
The invention provides a preparation method of graphite oxide capable of being washed directly. The preparation method comprises the following steps that step one, crystalline flake graphite is takenas a raw material, a main intercalator and an auxiliary intercalator are added for intercalation treatment to obtain a graphite intercalation compound; the main intercalator is at least one of formicacid, acetic acid, phosphoric acid, concentrated nitric acid and concentrated sulfuric acid; the auxiliary intercalator is at least one of an aqueous hydrogen peroxide solution, performic acid and peracetic acid; step two, after redundant main intercalator and auxiliary intercalator of the graphite intercalation compound are filtered out, the filtered graphite intercalation compound is put into ice water, tiny impurity particles and water are filtered and washed off with a sieve, and the graphite intercalation compound with less impurities is obtained; step three, an oxidizing agent is added in the filtered graphite intercalation compound, oxidation is carried out for 0.5-50 hours under the condition of 0-45 DEG C, and the graphite oxide of which a PH value is 0-1 and capable of being washed directly by the water is obtained. By the method, the volume of the raw material is swelled to 300 times to 500 times or above.
Description
technical field [0001] The invention relates to the technical field of graphite manufacture, in particular to a preparation method of graphite oxide. Background technique [0002] The current methods for preparing graphite oxide include Brodie, Staudernmaie, and Hummers methods. The oxidation degree of graphite oxide obtained by Brodie method and Standenmaier method is low, and the oxidation degree of graphite oxide prepared by Hummers method is high. Graphite oxide or graphene oxide prepared by these methods is subjected to suction filtration, centrifugation, or dialysis and water washing to obtain a graphene oxide aqueous phase dispersion with a pH between 4 and 7. [0003] In summary, none of the existing graphite oxide preparation methods can obtain neutral graphite oxide through direct washing, which consumes a lot of manpower and material resources in actual operation, and is difficult to industrial scale, which severely limits the development of graphite oxide. Con...
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IPC IPC(8): C01B32/23C01B32/198
CPCC01B32/198C01B32/23
Inventor 武桐段亚强张燕萍赵志国
Owner SHANGHAI LEVSON ENTERPRISE GRP