The　MnO2　nanowires-deposited　diatomite　samples　were　prepared　using　the　hydrothermal　method　with　KMnO4　and　(NH4)(2)S2O8.　Physicochemical　properties　of　the　samples　were　characterized　by　means　of　numerous　techniques,　and　their　efficiency　for　the　removal　of　Cr(VI)　and　As(V)　was　determined.　The　parameters,　such　as　pH　value,　adsorption　time,　adsorbent　mass,　and　initial　Cr(VI)　or　As(V)　concentration,　could　influence　the　Cr(VI)　and　As(V)　removal　efficiency　or　adsorption　capacity　of　the　MnO2　nanowires/diatomite　sample　obtained　after　hydrothermal　treatment　at　90　degrees　C　for　12　h.　These　MnO2　nanowires/diatomite　samples　showed　high　surface　areas　and　superb　Cr(VI)　and　As(V)　adsorption　behaviors,　with　the　maximum　Cr(VI)　and　As(V)　adsorption　capacities　being　197.6　and　108.2　mg/g,　respectively.　The　Cr(VI)　and　As(V)　adsorption　mechanisms　of　the　samples　were　also　discussed.　(C)　2014　Elsevier　Inc.　All　rights　reserved.