In order to meet the stringent regulation of arsenic in aqueous solutions, carbon-based nanoporous carbon (CN) material was prepared as adsorbents and tested to remove arsenic ion from aqueous solutions. Nitrogen-doped carbon was synthesized by chlorination and itexhibited well-developed micro- and small meso-pores with uniform pore structures. The structure and characteristics of the adsorbents thus developed were confirmed by field-emission scanning electron microscopy, transmission electron microscopy, Brunauer´┐ŻEmmett´┐ŻTeller analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. Among the CNs developed, CN700 exhibited high adsorption capacity for arsenic (31.08 mg/g). The adsorption efficiency for arsenic ion was confirmed to be affected by the synthesis temperature of CNs. These results suggest that CNs are useful adsorbents for the treatment of arsenic, and in particular, CN700 demonstrates potential for application as an adsorbent for the removal of anionic heavy metals from wastewater and sewage