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ABSTRACT A novel biomass carbon doped with dual-metal oxide mischcrystal (cobalt oxide and molybdenum oxide) was synthesized by using _Enteromorpha_ (EP) of marine algae as carbon source. Multi-wrinkles biomass carbon (MWBC) with magnetic properties was obtained and formed highly dispersed CoO_x_/MoO_y_ nanoparticles onto the surface of MWBC in situ via a simple impregnation and direct carbonization at 700 °C. The framework of CoO_x_/[email protected] was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy. The as-prepared CoO_x_/[email protected] was applied as efficient adsorbents for selective removal methyl blue (MB) at pH 10 from water medium. For comparison, single metal-derived porous carbon, i.e., CoO_[email protected] and [email protected], was also synthesized, characterized and tested for MB adsorption. The results exhibited that CoO_x_/[email protected] has the highest MB adsorption capacity (1587.3 mg g−1) and excellent selectivity. In addition, it could be easily separated from water by an external magnetic field without any organic reagent added. Adsorption equilibrium data were described by _Langmuir_ and _Freundlich_ isotherms, and kinetic data were described by pseudo-first-order, pseudo-second-order and intraparticle diffusion model. Moreover, CoO_x_/[email protected] also owned outstanding stability and renewability, which can be regenerated by an easy-going method of ethanol washing and reused at least 10 times without a significant loss in removal percentage.