Magnetic　porous　Fe-Mn　binary　oxide　nanowires　were　successfully　fabricated　to　efficient　removal　of　As(III)　from　water.　The　adsorption　capacity　of　the　porous　nanowires　for　As(III)　obviously　increased　with　increasing　of　manganese　oxide　in　the　composite,　accompanying　decrease　of　the　saturation　magnetization　of　the　adsorbents.　Magnetic　porous　Fe-Mn　binary　oxide　nanowires　with　an　initial　Fe:Mn　molar　ratio　of　1:3　exhibited　the　highest　absorption　capacity　for　As(III)　and　enable　magnetic　separation　from　water.　The　maximal　adsorption　capacity　value　is　171mgg-1　at　pH　7.0.　In　the　initial　pH　range　from　3　to　9,　200μgL-1　of　As(III)　could　be　easily　decreased　to　below　10μgL-1　by　the　magnetic　porous　Fe-Mn　binary　oxide　nanowires　(0.05gL-1)　within　75min,　and　the　corresponding　residual　As　was　completely　oxidized　to　less　toxic　As(V).　The　coexisting　chloride,　nitrate　and　sulfate　had　no　significant　effect　on　arsenic　removal,　whereas,　phosphate　and　humic　acid　reduced　the　removal　of　As(III)　by　competing　with　arsenic　species　for　adsorption　sites.　The　resulting　magnetic　porous　Fe-Mn　binary　oxide　nanowires　could　be　a　promising　adsorbent　for　As(III)　removal　from　water.　©　2014　Elsevier　B.V.