Thus, arsenicals will be desorbed from medium-oxidized phosphorene by treatment with NaOH eluents, restoring the sorption sites for repetitive adsorption-desorption cycles. Note that hydroxide anions can be further removed from nanoadsorbents by simple washing with deionized water until a neutral pH is achieved . On the contrary, the recovery of highly oxidized phosphorene [PhosO(1:2), PhosO(1:1)] with alkaline eluents does not appear like a feasible procedure, since the hydroxide uptake (Eads<0.8 eV) do not overcome the sorption stability reached by arsenicals (Eads>1.0 eV). This behavior emerges from the high oxygen content in PhosO(1:2) and PhosO(1:1); this is negatively charged adsorption sites will repel hydroxide anions with a larger magnitude than arsenicals due to the localized negative charge of OH -.