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Analysis table of optimal preparation conditions of expanded graphite


He, Jun et al. (2022), Analysis table of optimal preparation conditions of expanded graphite, Dryad, Dataset,


The environmentally friendly preparation of sulfur-free expanded graphite (EG) remains a great challenge. A large amount of strong acids and strong oxidants were used in the preparation of expandable graphite, resulting in environmental pollution problems. Herein, a novel and green preparation method for sulfur-free expanded graphite (EG) has been developed. Sulfur-free EG was fabricated using natural flake graphite (NFG), sodium perchlorate (NaClO4), and oxalic acid (C2H2O4) as raw materials. The electrochemical oxidation method was applied to prepare sulfur-free expandable graphite, and microwave irradiation technology was adopted to prepare sulfur-free EG. The optimum weight ratio was as follows: NFG:NaClO4:C2H2O4 = 1.5:10:2. The anodic oxidation occurred under a constant current density of 47 mA/cm2, and the intercalation reaction lasted for 60 min at ambient temperature. The largest expanded volume (EV) of sulfur-free EG was 290 mL/g. The FTIR spectrum proved that the ClO4 and COO groups had entered the graphite layers. The SEM images showed that the graphite layers were completely opened, and the pore structure was clearly observed. The sulfur-free EG prepared by the method does not cause environmental pollution and has broad application prospects.


A certain amount of sulfur-free expandable graphite was weighed, and the EV was measured using a 150 mL graduated cylinder after expansion. The EV of the EG was calculated by the following equation: EV = V/M (mL/g). The higher expansion volume indicates that the more expanded graphite is obtained.

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.xlsx format


Natural Science Foundation of Hebei Province, Award: B2020203013