Common strategies for catalytic graphitization of biochar into graphitic porous carbon (GPC) still face great challenges

such as the realization of simple procedures

energy conservation

and green processes. Controlling over the graphitization degree and pore structure of biochar is the key to its structural diversification. Herein

a clean and energy-efficient method is developed to synthesize adjustable graphitic degree and structure porosity GPC from rice husk-based carbon (RHC) at a relatively low temperature of 800–1000 ℃ with environment-benign organometallic catalyst ethylenediaminetetraacetic acid ferric sodium salt (EDTA-iron) and the recovery ratio of catalyst is as high as 97%. The formed by the organic ligands of EDTA-iron facilitates the etching of RHC surface and pore by iron

resulting in highly graphitized and developed porous GPCs. The pore structure and graphitization degree of GPCs can be adjusted by altering the catalyst loading

temperature

and holding time. The catalyst EDTA-iron with a lower concentration mainly plays the role of etching

which promotes the formation of porous carbon with larger surface area (

S

BET

= 1187.2 m

2

·g

-1

). The catalyst with higher concentration mainly plays the role of catalyzing graphitization and promotes the obtaining of graphitic carbon with high graphitization degree (

I

D

/

I

G

= 0.19). The mechanism of EDTA-iron catalyzed graphitization of RHC is explored by the comprehensive analysis of BET

XRD

Raman

TEM and TGA. This research not only provides an efficient method for the preparation of high-quality biomass-based graphite carbon

but also provides a feasible method for the preparation of biomass-based porous carbon.