ZnGa2O4　was　synthesized　from　Ca(NO3)(3)　and　ZnCl2　via　a　rapid　and　facile　microwave-assisted　hydrothermal　method.　The　photocatalytic　properties　of　the　as-prepared　ZnGa2O4　were　evaluated　by　the　degradation　of　pollutants　in　air　and　aqueous　solution　under　ultraviolet　(UV)　light　illumination.　The　results　demonstrated　that　ZnGa2O4　had　exhibited　efficient　photocatalytic　activities　higher　than　that　of　commercial　P25　(Degussa　Co.)　in　the　degradation　of　benzene,　toluene,　and　ethylbenzene,　respectively.　In　the　liquid　phase　degradation　of　dyes　(methyl　orange,　Rhodamine　B,　and　methylene　blue).　ZnGa2O4　has　also　exhibited　remarkable　activities　higher　than　that　of　P25.　After　32　min　of　UV　light　irradiation,　the　decomposition　ratio　of　methyl　orange　(10　ppm,　150　mL)　over　ZnGa2O4　(0.06　g)　was　up　to　99%.　The　TOC　tests　revealed　that　the　mineralization　ratio　of　MO　(10　ppm,　150　mL)　was　88.1%　after　90　min　of　reaction.　A　possible　mechanism　of　the　photocatalysis　over　ZnGa2O4　was　also　proposed.　(C)　2012　Elsevier　Inc.　All　rights　reserved.