Endeavoring　to　mitigate　and　remedy　Arsenic　(As)　in　groundwater,　we　developed　a　one-step　process　for　As(iii)　oxidation　and　subsequent　adsorption　by　using　α-Fe2O3　under　UV　irradiation.　The　α-Fe2O3　with　high　surface　area　was　successfully　prepared　through　a　mild　hydrothermal　reaction　using　Jarosite　waste　as　precursor.　During　the　treatment　of　As(iii)　in　aqueous　solution,　the　as-obtained　α-Fe2O3　can　release　ferric　ions　stimulated　by　UV　irradiation.　This　led　to　the　effective　oxidation　of　As(iii)　to　As(v)　which　is　further　adsorbed　on　α-Fe2O3,　realizing　the　removal　of　As　from　water.　This　simple　and　efficient　route　may　be　potential　for　the　remediation　of　polluted　water　containing　As　ions.　©　2012　The　Royal　Society　of　Chemistry.