1.33 mg/g) . Thus, phosphorene-based materials appear as new promising candidates for water treatment technologies by adsorption in the solid-phases, outstripping graphene(oxide)-based materials. Furthermore, surface oxidation is reported to increase the arsenic adsorption efficiency for layered materials such as graphene oxide . In the phosphorene case, synthesis at partially oxidized forms results in highly stable phosphorene oxides , which does not alter its two-dimensional (2D) structure. Additionally, different O:P ratios play a key role in the phosphorene properties (chemical stability, band structure, work-function, transport properties, among others) . First-principles calculations show that the increased oxygen content decreases the phosphorene bandgap in the range of 1.0-1.3 eV . Otherwise, phosphorene oxides obtained from black phosphorene show a straightforward synthesis compared to those based on blue phosphorene, where time demanding methods as well as epitaxial growth are employed . Therefore, the application of oxidized phosphorene nanoadsorbents based on black phosphorene could be a promising strategy for arsenic removal from polluted waters. However, minor efforts have been developed to characterize such applications to the best of our knowledge.