Abstract
A 3-D magnetic graphene ball (MGB) material was prepared using cellulose as the carbon source. Carbon-encapsulated iron nanoparticles (CEINs) were first prepared by hydrothermal carbonization of cellulose powder at 180°C. Then, the prepared CEINs were catalytically graphitized to graphene-encapsulated iron nanoparticles (GEINs) at 900°C. Finally, GEINs were treated in carbon dioxide at 700°C, during which the iron core was oxidized to magnetite (Fe3O4) nanoparticles, and graphene shells were peeled off from the iron cores to form graphene nanoplatelets. The graphene nanoplatelets consist of 1–10 layers graphene with the in-plane size of 20–30 nm. The prepared 3-D MGB was investigated for the removal of oil from water, which demonstrated outstanding adsorption performance and excellent recyclability.
Highlights
Graphene, a 2-D planar sheet of carbon atoms packed in the honeycomb-like lattice, has many unique and excellent properties, such as high electronic conductivity, high mechanical strength, flexibility, thermal conductivity and stability, a wide range of light absorption, and high surface area
A 3-D magnetic graphene balls (3DMGBs) material was synthesized through a green process using cellulose powder as the carbon source
Spherical agglomerates of Carbon-encapsulated iron nanoparticles (CEINs) were first synthesized by low-temperature hydrothermal carbonization (HTC) of cellulose
Summary
A 2-D planar sheet of carbon atoms packed in the honeycomb-like lattice, has many unique and excellent properties, such as high electronic conductivity, high mechanical strength, flexibility, thermal conductivity and stability, a wide range of light absorption, and high surface area. Keywords Magnetic graphene balls, graphene nanoplatelets, hydrothermal carbonization, cellulose, catalytic graphitization, oil removal Carbon-encapsulated iron nanoparticles (CEINs) are first synthesized by low-temperature hydrothermal carbonization (HTC) using cellulose as carbon sources, and CEINs are catalytically graphitized at high temperature.
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