Nitrogen doping is a promising method for the preparation of functional carbon materials. In this study

a nitrogen-doped porous coral biochar was prepared by using bamboo as raw material

urea as nitrogen source

and KHCO

3

as green activator through

in-situ

pyrolysis. The structure of the obtained biochar was characterized by various techniques including nitrogen adsorption and desorption

Raman spectroscopy

X-ray photoelectron spectrometer

and

etc

. The adsorption properties of nitrogen-doped biochar were evaluated with phenol and methylene blue probes. The results showed that the nitrogen source ratio had a significant effect on the evolution of pore structure of biochar. Low urea addition ratio was beneficial to the development of pore structures. The optimum specific surface area of nitrogen-doped biochar could be up to 1693 m

2

·g

-1

. Nitrogen doping can effectively improve the adsorption capacity of biochar to phenol and methylene blue. Biochar prepared at 973.15 K with low urea addition ratio exhibited the highest adsorption capacity for phenol and methylene blu

e

and the equilibrium adsorption capacity was 169.0 mg·g

-1

and 499.3 mg·g

-1

respectively. By comparing the adsorption capacity of various adsorbents in related fields

it is proved that the nitrogen-doped biochar prepared in this study has a good adsorption effect.