In this regard, the superior adsorption ability towards arsenic species is attributed to the orbital part of the bonding, as shown by EDA and bonding results. However, this is not the case for the trivalent monomethyl arsenic TMA III , which is the only physisorbed contaminant since the electrostatic effect is the most prominent interaction with the oxidized phosphorene surface (Table ), even with a greater adsorption ability than the water molecule. Therefore, these results suggest that phosphorene oxide may not be intrinsically hydrophilic because the water molecule is weakly physisorbed, which makes this material a good candidate for water treatment. This agrees with the findings of the Sutter group ; they found that water adsorption does not perceptibly change the structure of oxidized phosphorene, confirming the primary role of oxygen on the surface in front of the water.