For instance, the adsorption energy reaches 1.67 eV for PhosO-aDMA V , displaying the stronger adsorption. Geometrical differences are observed in the participation of methyl groups pointing to the oxygen atoms of PhosO while one deprotonated oxygen is towards the surface phosphorous atoms (Fig. ). According to literature, the adsorption of iAs V , MMAs V , and DMAs V onto pristine graphene reaches adsorption energies of 0.5-0.7 eV, while higher values are reached with metal-doped graphene (2.9-4.2 eV) . Besides, iAs V and DMA V adsorbed onto hematite rise Eads of 0.60 and 0.34 eV, respectively, where a noncomplexation process via hydrogen bonding is verified by ATR-FTIR spectroscopy .