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Citation: Chen Wei, Shu Shili, Jia Xianfeng, Guo Qiangqiang. Preparation of Expanded Graphite by H₂SO₄/HNO₃ and Potassium Ferrate System[J]. Chemistry, ;2019, 82(12): 1121-1125. shu

Preparation of Expanded Graphite by H₂SO₄/HNO₃ and Potassium Ferrate System

Department of Chemistry, Tangshan Normal University, Tangshan Key laboratory of Green Specialty Chemicals, Tangshan 063000

Received Date: 21 June 2019
Accepted Date: 4 September 2019

Figures(8)

Expanded graphite was prepared by microwave method with natural flake graphite as raw material, concentrated sulfuric acid and nitric acid as intercalating agent, potassium ferrite as oxidant. The structure was characterized by IR spectrum, XRD and SEM. The effects of the amount of mixed acid and oxidizing agent, the proportion of mixed acid, the intercalated reaction temperature, and the intercalated reaction time on the expanding volume of obtained expanded graphite were discussed. Experimental results showed that when natural flake graphite (g):potassium ferrite (g):mixed acid (mL) is 1:0.3:18, sulfuric acid:nitric acid is 2:1, intercalated reaction temperature is 35℃, reaction time is 60min, the expanding volume reached about 75 mL/g, which is about 87.5% higher than when the sulfuric acid was used as the intercalant.
- Expanded graphite,
- Potassium ferrate,
- Mixed acid,
- Microwave method
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