The presence of heavy metals such as arsenic (As) and chromium (Cr) can be considered one of the most toxic heavy metals.This study aims to develop and evaluate a graphene oxide (GO) based material functionalized with ferrihydrite for the removal of As(V) in the presence of Cr(VI).The adsorbent ferrihydrite-functionalized graphene oxide (GOFH) was characterized by SEM, FTIR, XRD, XPS, surface charge, BET and TGA.Individual adsorption capacities for As(V) and Cr(VI) were 160 and 66 mg g-1 resp. at pH 4 and 298 K, fitting the Langmuir model.In binary systems, GOFH adsorbed As(V) with an adsorption capacity of 137 mg g-1 in the presence of 20 mg L-1 Cr(VI) at room temperatureThermodn. anal. revealed an exothermic and spontaneous process.Addnl., GOFH effectively removed several coexisting anions from groundwater, including SO42-, CO32- and Cl-.This work evidences the potential of GOFH for competitive adsorption of priority pollutants from complex matrixes.The GOFH material represents a tech. and economically viable technol. for application in groundwater decontamination, as it requires inexpensive precursors and ambient conditions during synthesis and operation.