eV. On the side of phosphorene oxide, the neutral methylarsenicals display adsorption energies between 0.42 and 0.91 eV, reaching an increment of up to 0.49 eV compared to intrinsic phosphorene. Anionic pentavalent methylarsenicals reach adsorption energies of 1.28-1.67 eV on phosphorene oxide, increasing up to 0.34 eV compared to intrinsic material.