Arsenic　(As)　is　one　of　the　most　toxic　metals　for　human　health.　In　the　present　work,　kapok　fibers　were　modified　using　iron　Fe(III)　to　enhance　As(V)　adsorption　and　then　characterized　using　Fourier　transform　infrared　spectroscopy　(FT-IR)　and　scanning　electron　microscopy　(SEM)　combined　with　energy　dispersive　X-ray　spectroscopy　(EDS).　The　impacts　of　pH,　dose　of　adsorbent,　contact　time,　initial　concentration,　temperature,　and　coexisting　ions　on　the　adsorption　of　As(V)　onto　Fe-modified　kapok　fiber　(Fe-kapok)　surfaces　were　investigated.　The　results　showed　that　the　adsorption　process　fit　more　to　the　Langmuir　isotherm　equation　and　pseudo　second　kinetic　equation,　thus　demonstrating　that　the　adsorption　was　an　endothermic,　spontaneous,　monolayer　chemisorption　process　with　some　disorder　at　the　solid/solution　interface.　The　adsorption　process　was　controlled　by　the　film　diffusion　step,　and　the　maximum　adsorption　capacity　of　Fe-kapok　was　calculated　to　be　approximately　367　mu　g/g.　Further　study　showed　that　after　8　adsorption/desorption　cycles　with　1　regeneration　cycle,　Fe-kapok　was　still　able　to　remove　45%　of　the　arsenic　(100　mu　g/L)　present　in　the　water.　A　notable　negative　impact　on　the　removal　of　As(V)　from　water　was　linked　to　the　concentrations　of　SO42-　and　PO43-　in　the　water.