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Peanut-like hematite has been prepared by a new facile hydrothermal method and applied in the adsorption removal of As(Ⅴ).The structural features of the as-prepared hematite were characterized systematically by X-ray diffraction,X-ray photoelectron spectroscopy,Brunauer-Emmett-Teller,scanning electron microscopy,energy-dispersive X-ray spectroscopy mapping,Fourier transform infrared spectroscopy,and transmission electron microscopy.Results showed that the morphologies of hematite could be tuned to spindle-like,oval-like,and cantaloupe-like shapes by adjusting the hydrothermal conditions.The peanut-like hematite formation followed a five-step route.At pH =3,the adsorption amount of As(Ⅴ) over peanut-like hematite reached 13.84 mg/g,and the adsorption kinetic process corresponded to the pseudo-second-order kinetic model.The peanut-like hematite also showed partial selectivity over As(Ⅴ) in the hydrosphere.This method can be a reference for the preparation of other architectural metal oxide materials.