Composition and structural evolution of graphene oxide prepared from Shenfu coal and its macerals
The preparation of graphene from coal as raw material is a very promising approach for coal material and high-value utilization.Exploring the evolution law of coal and its macerals in the preparation of graphene oxide based on their composition and structural differ-ences is the theoretical basis for developing coal based graphene preparation technology.The vitrinite and inertite groups in Shenfu coal were enriched by gravity separation,and graphitized carbon with different coal composition was obtained by high-temperature graphitiza-tion method,and the graphitized carbon was used as the precursor through modified Hummer oxidation method to prepare coal-based gra-phene oxide.Elemental analysis,FT-IR,XRD,Raman spectroscopy,SEM,TEM and AFM were used to study the composition and struc-ture evolution of Shenfu coal and its macerals,during the preparation of graphene oxide.The results show that carbonization treatment transforms the coal structure into an amorphous carbon structure,while high-temperature graphitization transforms the coal structure into a graphitized carbon structure.The rich-inertinite has a larger graphitized carbon microcrystalline structure due to the presence of layered structures with many aromatic structures units.After high-temperature graphitization treatment,for the graphitized carbon from rich-iner-tinite,Raman spectrum value(AD1/AG)is 0.382,and the value(AD1/AG)from rich-vitrinite is 0.686,and the value(AD1/AG)is 0.864 from the raw coal.The thickness of graphene oxide from graphitized carbon obtained from rich-inertinite is approximately 5 nm.The graphitized carbon prepared from rich-vitrinite mainly presents a block structure,and the graphite microcrystalline structure is small,resulting in a smaller size of graphene oxide with a thickness of approximately 10 nm.Due to the formation of rod like structures dur-ing graphitization in raw coal,it is difficult to form an ordered lamellar structure in raw coal due to the formation of rod structure dur-ing graphitization,and it is also difficult to obtain graphene oxide by oxidative stripping.
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